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Showing posts with label Vulnerability. Show all posts
Showing posts with label Vulnerability. Show all posts

Monday, 21 April 2014

Researchers got Rewarded by $10,000 for Reporting XXE Vulnerability in Google

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A critical bug XXE vulnerability has been found by researchers which let researchers access the internal files of Google's production servers. Sounds surprising but it has been really found by hackers which let hackers read any internal files.





As shown, the vulnerability was in Google Toolbar Button Gallery. Team of Researchers found a bug when they noticed that google allows users to customize their toolbars with adding new buttons. For developers its easy to make their own new buttons by uploading XML files containing Meta Data for styling.



This vulnerability can be called as "XML External Entity(XXE)" or "XML Injection". The researchers crafted there own buttons, by uploading it they gained access to internal files of Google Production server like they managed to read "/etc/passwd" and "/etc/hosts".

The team of researchers reported the vulnerability to Google  as we all know , Google is having a famous bug bounty program, When they reported XXE vulnerability to Google so they rewarded the researchers which $10,000 for identifying bug in search engine's feature.
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Tuesday, 15 April 2014

Billions of Smartphone Users affected by Heartbleed Vulnerability

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Billions of Smartphone Users affected by Heartbleed VulnerabilityHeartbleed has left a worst impression worldwide affecting millions of websites and is also supposed to put millions of Smartphones and tablets users at a great risk.Heartbleed is a critical bug (CVE-2014-0160) in the popular OpenSSL cryptographic software library, that actually resides in the OpenSSL's implementation of the TLS/DTLS heartbeat extension, which allows attackers to read portions of the affected server’s memory, potentially revealing users data such as usernames, passwords, and credit card numbers, that the server did not intend to reveal.OpenSSL is a widely-used cryptographic library which implements the SSL and TLS protocol and protects communications on the Internet, and mostly every websites use either SSL or TLS, even the Apache web server that powers almost half of the websites over internet utilizes OpenSSL.But to assume that the users using desktop browsers to visit websites are vulnerable to the Heartbleed bug, will be wrong. Despite 40-60 billion active Smartphone applications may be sharing some of those same servers or connect to their own group of servers that may also be compromised.Google wrote in an update on its Online Security blog on Wednesday, emphasizing that Android was not vulnerable to the Heartbleed bug, except for a very specific version and can you guess that so called specific version??Android 4.1.1 Jelly Bean, the one which makes up the majority of Android devices around the world, and which relies on the vulnerable version of OpenSSL.Google didn’t reveal the actual figure that are vulnerable to the bug, but according to the latest dashboard released by Google, it is estimated that around 34.4% of the Android devices in use today are running the Android 4.1.x version. Even last September Google announced that it had activated one billion devices. This means that the minimal number is likely to be in the millions. So, one can imagine how many Smartphones and tablets were at risk.Well, Google has released the patches for Android 4.1.1 which is being distributed among the Android partners.Apple users can be relaxed knowing that their devices running iOS and OS X are not affected by the most critical security flaw, Heartbleed."Apple takes security very seriously. IOS and OS X never incorporated the vulnerable software and key web-based services were not affected," Apple told Re/code.Instead using OpenSSL, Apple relies on different SSL/TLS libraries called Secure Transport, which was hit by its own very serious bug in February outcropping the possibility for man-in-the-middle (MitM) attacks — though it wasn't as dangerous as the recent OpenSSL Heartbleed security Flaw.But still Apple users were not exempted completely, as the users using BBM for private messages on iOS might have been vulnerable to this flaw.Blackberry confirmed that some of its products, including Secure Work Space for iOS and Android, and BlackBerry Link for Windows and Mac OS and even BBM for iOS and Android were vulnerable to the Heartbleed security flaw. The figure of affected users is not least, as about 80 million people use BBM service.They have also assured that BlackBerry Smartphones and tablets, BlackBerry Enterprise Server 5, BlackBerry Enterprise Service 10, and the BlackBerry Infrastructure are not affected by the flaw and are fully protected.
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Google Chrome vulnerability allows Websites to Eavesdrop on You

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Google Chrome vulnerability allows websites to Eavesdrop on YouJust imagine, you are sitting in front of your laptop and your laptop is listening to your nearby conversations. What if the recorded audio from the system’s microphone is being instantly uploaded to a malicious website?Google has created a speech-recognition Application Programming Interface (API) that allows websites to interact with Google Chrome and the computer’s microphone allows you to speak instead of typing into any text box, to make hands-free web searches, quick conversions, and audio translator also work with them.In January, a flaw was discovered in Google Chrome that enabled malicious websites with speech recognition software to eavesdrop on users’ conversations from background without their knowledge using an outdated Google speech API.A new similar vulnerability in Google Chrome has been discovered by Israeli security researcher, Guy Aharonovsky, claimed that the Chrome’s speech-recognition API has a vulnerability that allows attackers to turn victim's machine into a listening port without asking for any permission, even if your microphone is completely disabled.

"Even blocking any access to the microphone under chrome://settings/content will not remedy this flaw." he said in a blog post.

Reported vulnerability exploits the “-x-webkit-speech” feature of Chrome’s speech-recognition API and allows a malicious web application to eavesdrop in the background without any indication to the user that their microphone is enabled. He has also published a Proof-of-Concept webpage and a video demonstration, designed to work on Chrome for Mac operating system, but the exploit only works for Chrome for any operating system.In demonstration, he has used HTML5 full screen feature to the indication box.
“In Chrome all one need in order to access the user’s speech is to use this line of HTML5 code: that’s all; there will be no fancy confirmation screens. When the user clicks on that little grey microphone he will be recorded. The user will see the ‘indication box’ telling him to “Speak now” but that can be pushed out of the screen and / or obfuscated.”

He has reported the flaw to Google via Chromium bug tracker. They confirmed the existence of the vulnerability, but assigned it 'low' severity level, that means Google will not offer any immediate fix for this flaw.


 

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NSA denies Report that Agency knew and exploited Heartbleed Vulnerability

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NSA denies reports that Agency knew and exploited Heartbleed VulnerabilityThe Bloomberg claimed that the U.S. National Security Agency (NSA) knew about the most critical Heartbleed flaw and has been using it on a regular basis to gather “critical intelligence” and sensitive information for at least past two years and decided to keep the bug secret, citing two sources ‘familiar with the matter’.In response to the above report, NSA has issued a '94 character' statement today denying the claims that it has known about the Heartbleed bug since two years and that it has been using it silently for the purpose of surveillance."NSA was not aware of the recently identified Heartbleed vulnerability until it was made public," the U.S. intelligence agency said on its Twitter feed.Heartbleed is one of the biggest Internet vulnerabilities in recent history that left large number of cryptographic keys and private data such as usernames, passwords, and credit card numbers, from the most important sites and services on the Internet open for hackers. The bug resides in the "Heartbeat" feature of the most secured open source encryption protocol, OpenSSL, which is used by several social networks, search engines, banks and other websites to enable secure connections while transmitting data.A team of researchers from Codenomicon and Google Security researcher revealed the vulnerability this week that is in the wild since the new version 1.0.1f was released in March 2012. And just after the revelation, OpenSSL released the security Fix for the bug in its version 1.0.1g, but until then the Heartbleed bug made websites, email, instant messaging (IM), including some virtual private networks, on about half a million of the world's widely trusted web servers, open to hackers.The birth of the most critical bug Heartbleed was due to a mistake done by a German programmer Robin Seggelmann over two years ago while working on a new Heartbeat feature in the OpenSSL.He submitted the code of OpenSSL with the heartbeat feature in an update on New Year's Eve, 2011, and an “oversight” led to an error that unintentionally created the “Heartbleed” vulnerability.Yesterday he said it could be entirely possible that the government intelligence agencies had been making use of this critical flaw over the past two years.The fix was released just after, but the users’ data are vulnerable until the vulnerable websites didn’t implement it. You can only change your password immediately for those websites that are not affected, assuming that it was vulnerable before, just to make sure that you are now safe.Follow me on Google+, Twitter or LinkedIn or Contact via Email.

View the original article here

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OpenSSL vulnerability allows hackers to read 64k of memory on target server

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HeartBleed: A potentially critical security vulnerability in OpenSSL has been discovered that allows an attacker to read up to 64kilobytes of memory from the server running a vulnerable OpenSSL version.

As a normal user, you may not aware what is OpenSSL.  It is cryptographic library which is used for encrypting communication between web server and users - used by plenty of websites including Google, Yahoo, Twitter.

The bug( CVE-2014-0160), dubbed as 'HeartBleed', was independently discovered by Neel Mehta from Google Security team and Codenomicon.  The bug appropriately named HeartBleed because vulnerability is located in HeartBeat extension and it leads to memory leak.

The attacker can read only up to 64k of memory during one iteration of the attack.  However, according to Heardbleed.com, an attacker can "keep reconnecting or during an active TLS connection keep requesting arbitrary number of 64 kilobyte chunks of memory content until enough secrets are revealed".

An attacker can retrieve the private key used for encrypting the communication that will allow to read all information passed to server and user like it wasn't encrypted at all.

How to fix it?
If your server is using OpenSSL 1.0.1 and 1.0.1f, then better upgrade to 1.0.1g. If you are using 1.0.0 and 0.9.8, you are not vulnerable to this bug.  As a temporary fix, users can remove HeartBeat extension by recompiling OpenSSL with -DOPENSSL_NO_HEARTBEATS

Check whether Your server is vulnerable or not:
"http://filippo.io/Heartbleed/" allows to find whether your server is vulnerable to this bug or not.

Details about the Bug:
TLS Heartbeat extension is to ping from one end to another end - a specific message with size of it is being sent from client to server and server responds with the same message.

But, if an attacker send a small size of data(Let's say 1 kilo byte) and claims it's large size(64k), then the server(running vulnerable OpenSSL) will respond with 1 kilo byte of attacker's data + 63 kilobytes of data read from memory of the server.

Technical details of this bug can be found here .(read only if you are good in 'C' program).

Here is POC script written in Python: https://gist.github.com/ixs/10116537

*Update:
Metasploit Module :
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ssl/openssl_heartbleed.rb

Nessus Plugin:
http://www.tenable.com/plugins/index.php?view=single&id=73404

Nmap Script(NSE):
http://nmap.org/nsedoc/scripts/ssl-heartbleed.html

One should always be careful, when using pointers in C programming ;)
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How researchers hack Google using XXE vulnerability !

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What is most secure website? NOTHING.  Even Google is vulnerable to all sort of attacks!

Security researchers and Co-Founders of Detectify have discovered a critical security vulnerability in Google that allowed them to access Internal servers.

The vulnerability exists in the Google Toolbar button gallery.  The page allows users to customize their toolbar with buttons. It also allows users to create their own buttons by uploading XML file containing various meta data.

Researchers identified this function is vulnerable to XML External Entity vulnerability.

By sending a crafted XML file, researchers are able to gain access to internal files stored in one of Google's product server.  They have managed to read the 'etc/passwd' and 'etc/hosts' files of the server. 

By exploiting this vulnerability, researchers could have accessed any files on the Google's server, also they could have done SSRF Exploitation to access internal systems.

Google has rewarded the researchers with $10,000 for finding and reporting this vulnerability. 
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Wednesday, 9 April 2014

LinkedIn Hack Tool Exposes Users' Emails without Exploiting Any Vulnerability

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LinkedIn Hack Tool Exposes Users' Emails without Exploiting Any Vulnerability


A Free Chrome, Firefox and Safari web browser plugin floating around the web, called 'Sell Hack' allows users to view the hidden email address of any LinkedIn user, means anyone can grab email addresses that we use for professional purposes.When installed, the 'Sell Hack' plugin will pop up a 'Hack In' button on LinkedIn profiles and further automatically mines email addresses of LinkedIn users.It's not a Security breach, LinkedIn has confirmed that no LinkedIn data has been compromised, but rather this free extension rely on an algorithm that checks publicly available data in order to guess users’ email addresses.So without exploiting any loophole or vulnerability, Sell Hack is capable of predicting users' email addresses with OSINT (Open-Source Intelligence) techniques i.e. information collected from publicly available sources.It is also possible that, the Sell Hack extension is gathering data from users who have installed it, allows plugin to watch your activity on the site and collect the information of any direct connection whose page you've decided to visit; so this way Sell Hack can cross-serve the collected data to other users.LinkedIn users who have downloaded Sell Hack should uninstall it immediately, "LinkedIn members who downloaded Sell Hack should uninstall it immediately and contact Sell Hack requesting that their data be deleted." LinkedIn officials warned.The Professional Social Network giant LinkedIn has decided to take legal action and publicly criticised Sell Hack in statements. LinkedIn pulled SellHack Team to the door of judiciary for disclosing the email IDs of users to the un-connected users."We are doing everything we can to shut Sell Hack down. On 31 March LinkedIn's legal team delivered Sell Hack a cease-and-desist letter as a result of several violations," a LinkedIn spokesman said.The Developers Sell Hack tool explained, “The data we process is all publicly available. We just do the heavy lifting and complicated computing to save you time.


We aren't doing anything malicious to a Social website. We think browser extensions are the best way to personalize an individual's web experience.”On their website, Sell Hack answered, How does it work? "If we don't received a validation response, we'll present a 'copy all' button to copy & paste the list for your own uses: i.e. check your own data sources or BCC email the entire list etc." that Means, if service will not be able to guess the user's email address, it will ask you to enter your emails database for further match-search.Two days back LinkedIn has sent a cease-and-desist notice to Sell Hack for violating the LinkedIn Terms of Service and as a result the SellHack extension is no more working on the LinkedIn pages. "SellHack plugin no longer works on LinkedIn pages," developers stated.

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5-year-old Boy discovers Microsoft Xbox Password Bypass vulnerability

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5-year-old Boy discovers Microsoft Xbox Password Bypass vulnerability


A 5-year-old San Diego boy managed to hack one of the most popular gaming systems in the world, Xbox and has now been acknowledged as a security researcher by Microsoft.Kristoffer Von Hassel uncovered a vulnerability in Xbox Live's password system, that would allow someone to log into a Xbox player's account without their password. Kristoffer's parents noticed he was logging into his father's Xbox Live account simply by tapping the space bar.YES, BACKDOOR ENTRY WITH JUST SPACE-BARHis father noticed that Kristoffer logged in as his Xbox Live account to play video games that he wasn't meant to be playing and asked how he had done it. Kristoffer revealed that by typing in the wrong password and then by pressing the spacebar, he bypassed the password verification through a backdoor, and it was pretty simple!5-year-old gamer actually hacked the authentication system of a multi-billion dollar company, and his feeling "was like yeah!", Kristoffer said to local news station KGTV.


His father reported the vulnerability to Microsoft Security Team, and it has been fixed by them. Microsoft issued a statement, “We're always listening to our customers and thank them for bringing issues to our attention. We take security seriously at Xbox and fixed the issue as soon as we learned about it.”Microsoft awarded the junior security researcher with some cool games, $50 bugs, a one-year free subscription to Xbox Live and listed his name on their website among other security researchers.


I wish a bright Infosec career ahead of him. Cheers!

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Hackers Target Al Arabiya, Leak Passwords After Exploiting Zimbra Vulnerability.

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http://www.debbieschlussel.com/archives/alarabiya2.jpg 

Hackers associated with notorious LullzCrew are back in public stunts. Yesterday they targeted Al Arabia, Saudi owned Tv Channel, and leaked its sensitive data. Lullz Crew says it's back again and now it has teamed up with Horsemen of Lullz, another hacktivist group, to launch a massive operation against the system. Lullz Crew had been in news for attacking largest media organization before. 

This time too, they have targeted Al Arabia, the leading media franchise in Middle East. The hackers wrote in a statement next to the data they leaked, " Al Arabiya is the second largest news agency in the Middle East. 

Considering we've been targeting large media corporations? Well, it falls right into our range; So, without further ado. NullCrew and The Horsement Of Lulz persent to you? The candies,” The hackers exploited the vulnerability in email and web client software Zimbra to gain access to data. LullzCrew told Softpedia that they have got access to a huge amount of data , “Do we plan to release more? It all depends on how much use it holds to us, things of particular use can be used over, and over again. We treat certain data the same way we treat 0day. Why leak it when it can be used properly down the road?” they told in a Twitter message.
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Monday, 7 April 2014

Vulnerability in World's Largest Site Turned Million of Visitors into DDoS Zombies

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Vulnerability in World's Largest Site Turns Million of Visitors into DDoS Zombies


An application layer or 'layer 7' distributed denial of service (DDoS) attacks is one of the most complicated web attack that disguised to look like legitimate traffic but targets specific areas of a website, making it even more difficult to detect and mitigate.Just Yesterday Cloud-based security service provider 'Incapsula' detected a unique application layer DDoS attack, carried out using traffic hijacking techniques. DDoS attack flooded one of their client with over 20 million GET requests, originating from browsers of over 22,000 Internet users.What makes this case especially interesting is the fact that the attack was enabled by persistent XSS vulnerability in one of the world’s largest and most popular site - one of the domains on Alexa’s “Top 50” list.XSS vulnerability to Large-Scale DDoS AttackIncapsula has not disclosed the name of vulnerable website for security reasons, but mentioned it as a high profile video content provider website, allows its users to sign-up and sign-in with their own profiles.


The DDoS attack was enabled by a Persistent XSS (Cross site scripting) vulnerability that allowed the attacker to inject a malicious JavaScript code into the tag associated with the profile image.


Vulnerability in World's Largest Site Turns Million of Visitors into DDoS Zombies


So, as each time a legitimate visitor arrived to any webpage on the vulnerable domain (e.g. pages where attacker has commented from his profile), attacker's profile image will also load into the visitor's browser and it would automatically execute the injected JavaScript which in turn injects a hidden iframe with the address of the DDoSers C&C domain.According to Incapsula, attackers are using a Ajax-script based DDoS tool, that force browser to issue a DDoS request at the rate of one request per second."Obviously one request per second is not a lot. However, when dealing with video content of 10, 20 and 30 minutes in length and with thousands of views every minute, the attack can quickly become very large and extremely dangerous." researchers explained.


Vulnerability in World's Largest Site Turns Million of Visitors into DDoS Zombies


So to make it a large scale DDoS attack, attacker strategically posted comments on the popular video pages, effectively created a self-sustaining botnet comprising tens of thousands of hijacked browsers, operated by unsuspecting human visitors who were only there to watch a few funny cat videos.The attack was blocked by Incapsula’s progressive challenges and behaviour-based security algorithms, made that much more effective by the predictable behaviour of the DDoS tool. "By intercepting the malicious requests, we were also able to trace back the attack’s source. We did this by replacing the content of the target URL with a snippet of our own JavaScript, which reported the original referral source – leading us to the abused video website. " they said,Researchers also mentioned that attackers behind recent DDoS attack have upgraded their DDoS tool to a much more robust version. "This leads us to believe that what we saw yesterday was a sort of POC test run. " Incapsula quickly reached out to the vulnerable video website support team to patch the flaw.

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WinRAR File Extension Spoofing vulnerability allows Hackers to Hide Malware

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WinRAR file extension spoofing vulnerability


Imagine, You Open a Winrar archive of MP3 files, but what if it will install a malware into your system when you play anyone of them.


WinRAR, a widely used file archiver and data compression utility helps hackers to distribute malicious code. Israeli security researcher Danor Cohen (An7i) discovered the WinRAR file extension spoofing vulnerability.

WinRAR file extension spoofing vulnerability allows hackers to modify the filename and extension inside the traditional file archive, that helps them to hide binary malicious code inside an archive, pretending itself as '.jpg' , '.txt' or any other format.Using a Hex editor tool, he analysed a ZIP file and noticed that winrar tool also adds some custom properties to an archive, including two names - First name is the original filename (FAX.png) and second name is the filename (FAX.png) that will appear at the WINRAR GUI window.Danor manipulated the second filename and extension to prepare a special ZIP archive, that actually include a malware file "FAX.exe", but displaying itself as "FAX.png" to the user.WinRAR file extension spoofing vulnerabilityCyber intelligence company, IntelCrawler also published a report, which revealed that cybercriminals specialized in cyber espionage attacks are using this zero-day vulnerability in the wild to target several aerospace corporations, military subcontractors, embassies, as well as Fortune Global 500 companies.Using this technique, an attacker can drop any malware in very convincing manner to the victim's system. "Using this method the bad actors bypass some specific security measures including e-mail server’s antivirus systems" IntelCrawler said.Danor successfully exploited winrar version 4.20, and IntelCrawler confirmed that the vulnerability also works on all WinRar versions including v.5.1.

HOW TO CREATE EXPLOITABLE ZIP FILE?
A video demonstration has been prepared by Indian Security Researcher Ajin Abraham, shown below:
"One of the chosen tactics includes malicious fake CV distribution and FOUO (For Official Use Only)-like documents, including fax scanned messages"

Using social engineering techniques, attacker are targeting high profile victims with spear phishing mails, "Most of sent malicious attachments are hidden as graphical files, but password protected in order to avoid antivirus or IDS/IPS detection." IntelCrawler reported.
WinRAR file extension spoofing vulnerabilityIn above example, the Malware archive file was password protected to avoid antivirus detection, used in an ongoing targeted cyber espionage campaign.

Researchers found Zeus-like Trojan as an attachment, which has ability to establish remote administration channel with the infected victim, gather passwords and system information, then send the collected and stolen data to the Command & Control server hosted in Turkey (IP 185.9.159.211, Salay Telekomünikasyon).


Users are advised to use an alternative archiving software and avoid opening archives with passwords even if it has legitimate files.

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XSS vulnerability enables unique DDoS attack

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 https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEid_BRn-YPODaSQ3-_PPpZkkFDuUD_QgAXJGe9EaWLI9qnb5IspZwV3Fc55fEJlvX0XEarIVXzmD_wTK4B2UNkomNsfDWMmNptn41RffBlDA6ojvSUC5ns0iOxnyGqCisYajFqW6KyRJjxM/s1600/cybernewsalerts.jpg
XSS vulnerability in popular video site enables unique DDoS attack California-based website security company Incapsula said that a persistent cross site script XSS vulnerability in a popular video sharing site facilitied a DDoS attack against a different site. 

Attack was repelled by Incapsula on Thursday. Ronen Atias, Security researcher at incapsula, said the videos site is extremely popular with Top 50 Alexa . However he said that the name of the site and the that of DDOS target site can't be disclosed right now. 

Specific details of the vulnerability also could not be revealed, at least not until it is fixed, but Atias did explain how the attack worked. He said it began with the attacker using the persistent XSS vulnerability to inject a JavaScript payload into the tag for a member's profile picture on the video website.

 Next, the attacker chose to post in the comments section of the most popular videos. This caused the injected image to be hosted on those pages, so whenever the videos were viewed, the JavaScript activated, GET requests were sent to target sites, and, ultimately, the DDoS was carried out with the unknowing aid of viewers.

 In the end, Incapsula's client was hit by more than 20 million GET requests stemming from more than 22,000 viewers, according to the post. In a Friday email correspondence, Igal Zeifman, product evangelist with Incapsula, explained to SCMagazine.com how the company picked up on the attack. 

The Incapsula says this is really big deal as the DDOS attack was carried out through such a prominent site.
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Tuesday, 1 April 2014

Critical SSRF vulnerability in Paypal's subsidiary allows to access Internal Network

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Shubham Shah, a web application pentester from Australia, has discovered a critical Server Side Request Forgery(SSRF) vulnerability in the Bill Me Later website, a subsidiary of Paypal. The vulnerability exists in the subdomain(merchants.billmelater.com).

"The vulnerability itself was found within a test bed for BillMeLater’s SOAP API, which allowed for queries to be made to any given host URL." researcher explained in his blog post.

An attacker is able to send request to any internal network through the API and get the response.  Some internal admin pages allowed him to query internal databases without asking any login credentials.

Researcher says that a successful exploitation may result in compromising the customers data.

The bug was reported to Paypal on October 2013 and he got reward from them on Jan. 2014.

Paypal has partially fixed the bug by restricting the SOAP API to access the internal servers.  However, researcher says that it still act as proxy to view other hosts.

If you would like to know more details about SSRF vulnerability and how it can be exploited for port scanning or internal network finding, you can refer the Riyaz Waliker blog post and this document.
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Thursday, 27 March 2014

Express Language(EL) Injection vulnerability in Paypal's subsidiary

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An Indian Security researcher Piyush Malik has discovered an Expression Language(EL) Injection security flaw in Zong, a subsidiary of Paypal.

According to OWASP, EL Injection is a vulnerability that allows hacker to control data passed to the EL Interpreter.  In some cases, it allows attackers to execute arbitrary code on the server.

Researcher Malik said in his blog that Zong was running an outdated version of Clearspace(Now known as Jive software) on a subdomain.

"Clearspace is a Knowledge management tool and is Integrated with Spring Framework. EL Pattern was used in Spring JSP Tags which made Clearspace Vulnerable to this Bug." Malik explained in his blog.

He found two forms in the site which are vulnerable to this bug. He was able to perform some arithmetic operations using the vulnerable field.

One of the vulnerable urls:

https://clearspace.zong.com/login!input.jspa?unauth=${custom command here}

An attacker can inject a Express Language command on the 'unauth' field which will be executed in the server.  In his demo, researcher inject an arithmetic command(https://clearspace.zong.com/login!input.jspa?unauth=${100*3}) and able to executed it.

Paypal has offered some bounty amount for his finding.  Researcher didn't disclose the bounty amount.

About EL Injection vulnerability is first documented by security researchers from Minded Security in 2011.  You can find the document here: https://www.mindedsecurity.com/fileshare/ExpressionLanguageInjection.pdf
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Wednesday, 26 March 2014

Microsoft Word Zero-Day Vulnerability is being exploited in the Wild

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Microsoft Word Zero-Day Vulnerability is being exploited in the Wild


Microsoft warned about a zero-day vulnerability in Microsoft Word that is being actively exploited in targeted attacks and discovered by the Google security team. “At this time, we are aware of limited, targeted attacks directed at Microsoft Word 2010…” company said.According to Microsoft's security advisory, Microsoft Word is vulnerable to  a remote code execution vulnerability (CVE-2014-1761) that can be exploited by a specially crafted Rich Text Format (RTF).An Attacker can simply infect the victim's system with malware if a user opens a malicious Rich Text Format (RTF), or merely preview the message in Microsoft Outlook."The issue is caused when Microsoft Word parses specially crafted RTF-formatted data causing system memory to become corrupted in such a way that an attacker could execute arbitrary code."Microsoft acknowledged that remote code execution flaw also exists in Microsoft Word 2003, 2007, 2013, Word Viewer and Office for Mac 2011.Microsoft is working on an official patch, which will be released with the next Patch Tuesday security updates on April 8.But in the meantime, Windows users can use temporary 'Fix It' tool to patch this vulnerability and also can install Enhanced Mitigation Experience Toolkit (EMET) tool that can mitigate this vulnerability.Do not download .RTF files from the suspicious websites, and do not open or preview .RTF email attachments from strangers.Follow me on Google+, Twitter or Facebook or Contact via Email.

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