Showing posts with label 0day Exploit. Show all posts
Showing posts with label 0day Exploit. Show all posts

Thursday, 25 June 2015

eBay Covert Redirect Web Security Bugs Based on Googleads.g.doubleclick.net



 

 

 

 

 

 



eBay Covert Redirect Vulnerability Based on Googleads.g.doubleclick.net


(1) WebSite:
ebay.com


"eBay Inc. (stylized as ebay, formerly eBay) is an American multinational corporation and e-commerce company, providing consumer to consumer & business to consumer sales services via Internet. It is headquartered in San Jose, California. eBay was founded by Pierre Omidyar in 1995, and became a notable success story of the dot-com bubble. Today, it is a multi-billion dollar business with operations localized in over thirty countries.

The company manages eBay.com, an online auction and shopping website in which people and businesses buy and sell a broad variety of goods and services worldwide. In addition to its auction-style sales, the website has since expanded to include "Buy It Now" shopping; shopping by UPC, ISBN, or other kind of SKU (via Half.com); online classified advertisements (via Kijiji or eBay Classifieds); online event ticket trading (via StubHub); online money transfers (via PayPal) and other services." (Wikipedia)







(2) Vulnerability Description:
eBay web application has a computer cyber security problem. Hacker can exploit it by Covert Redirect attacks. 




The vulnerability occurs at “ebay.com/rover” page with “&mpre” parameter, i.e.
http://rover.ebay.com/rover/1/711-67261-24966-0/2?mtid=691&kwid=1&crlp=1_263602&itemid=370825182102&mpre=http://www.google.com
The vulnerability can be attacked without user login. Tests were performed on Firefox (26.0) in Ubuntu (12.04) and IE (9.0.15) in Windows 7.









(2.1) When a user is redirected from eBay to another site, eBay will check whether the redirected URL belongs to domains in eBay’s whitelist, e.g.
google.com

If this is true, the redirection will be allowed.
However, if the URLs in a redirected domain have open URL redirection vulnerabilities themselves, a user could be redirected from eBay to a vulnerable URL in that domain first and later be redirected from this vulnerable site to a malicious site. This is as if being redirected from eBay directly.
One of the vulnerable domain is,
http://googleads.g.doubleclick.net (Google’s Ad system)






(2.2) Use one of  webpages for the following tests. The webpage address is “http://itinfotech.tumblr.com/“. We can suppose that this webpage is malicious.
Vulnerable URL:





POC:




Poc Video:


Blog Detail:





(3) What is Covert Redirect? 

Covert Redirect is a class of security bugs disclosed in May 2014. It is an application that takes a parameter and redirects a user to the parameter value without sufficient validation. This often makes use of Open Redirect and XSS vulnerabilities in third-party applications.


Covert Redirect is also related to single sign-on. It is known by its influence on OAuth and OpenID. Hacker may use it to steal users' sensitive information. Almost all OAuth 2.0 and OpenID providers worldwide are affected. Covert Redirect was found and dubbed by a Mathematics PhD student Wang Jing from School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.


After Covert Redirect was published, it is kept in some common databases such as SCIP, OSVDB, Bugtraq, and X-Force. Its scipID is 13185, while OSVDB reference number is 106567. Bugtraq ID: 67196.  X-Force reference number is 93031.






Discover and Reporter:
Wang Jing, Division of Mathematical Sciences (MAS), School of Physical and Mathematical Sciences (SPMS), Nanyang Technological University (NTU), Singapore. (@justqdjing)











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Friday, 19 June 2015

The Weather Channel at Least 76.3% Links Vulnerable to XSS Attacks

The Weather Channel at Least 76.3% Links Vulnerable to XSS Attacks




Domain Description:
http://www.weather.com/




"The Weather Channel is an American basic cable and satellite television channel which broadcasts weather forecasts and weather-related news and analyses, along with documentaries and entertainment programming related to weather.  Launched on May 2, 1982, the channel broadcasts weather forecasts and weather-related news and analysis, along with documentaries and entertainment programming related to weather."

"As of February 2015, The Weather Channel was received by approximately 97.3 million American households that subscribe to a pay television service (83.6% of U.S. households with at least one television set), which gave it the highest national distribution of any U.S. cable channel. However, it was subsequently dropped by Verizon FiOS (losing its approximately 5.5 millions subscribers), giving the title of most distributed network to HLN. Actual viewership of the channel averaged 210,000 during 2013 and has been declining for several years. Content from The Weather Channel is available for purchase from the NBCUniversal Archives." (Wikipedia)




Vulnerability description:


The Weather Channel has a cyber security problem. Hacker can exploit it by XSS bugs.


Almost all links under the domain weather.com are vulnerable to XSS attacks. Attackers just need to add script at the end of The Weather Channel's URLs. Then the scripts will be executed.


10 thousands of Links were tested based a self-written tool. During the tests, 76.3% of links belong to weather.com were vulnerable to XSS attacks.


The reason of this vulnerability is that Weather Channel uses URLs to construct its HTML tags without filtering malicious script codes. 




The vulnerability can be attacked without user login. Tests were performed on Firefox (34.0) in Ubuntu (14.04) and IE (9.0.15) in Windows 8.



















POC Codes, e.g.
http://www.weather.com/slideshows/main/"--/>"><img src=x onerror=prompt('justqdjing')>
http://www.weather.com/home-garden/home/white-house-lawns-20140316%22--/"--/>"><img src=x onerror=prompt('justqdjing')>t%28%27justqdjing%27%29%3E
http://www.weather.com/news/main/"><img src=x onerror=prompt('justqdjing')>







POC Video:






The Weather Channel has patched this Vulnerability in late November, 2014 (last Week).  "The Full Disclosure mailing list is a public forum for detailed discussion of vulnerabilities and exploitation techniques, as well as tools, papers, news, and events of interest to the community. FD differs from other security lists in its open nature and support for researchers' right to decide how to disclose their own discovered bugs. The full disclosure movement has been credited with forcing vendors to better secure their products and to publicly acknowledge and fix flaws rather than hide them. Vendor legal intimidation and censorship attempts are not tolerated here!" A great many of the fllowing web securities have been published here, Buffer overflow, HTTP Response Splitting (CRLF), CMD Injection, SQL injection, Phishing, Cross-site scripting, CSRF, Cyber-attack, Unvalidated Redirects and Forwards, Information Leakage, Denial of Service, File Inclusion, Weak Encryption, Privilege Escalation, Directory Traversal, HTML Injection, Spam. This bug was published at The Full Disclosure in November, 2014.








Discovered by:
Jing Wang, Division of Mathematical Sciences (MAS), School of Physical and Mathematical Sciences (SPMS), Nanyang Technological University (NTU), Singapore. (@justqdjing)








More Details:




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Wednesday, 17 June 2015

GetPocket getpocket.com CSRF (Cross-Site Request Forgery ) Web Security Vulnerability










GetPocket getpocket.com CSRF (Cross-Site Request Forgery ) Web Security Vulnerability

Domain: getpocket.com
"Pocket was founded in 2007 by Nate Weiner to help people save interesting articles, videos and more from the web for later enjoyment. Once saved to Pocket, the list of content is visible on any device — phone, tablet or computer. It can be viewed while waiting in line, on the couch, during commutes or travel — even offline. The world's leading save-for-later service currently has more than 17 million registered users and is integrated into more than 1500 apps including Flipboard, Twitter and Zite. It is available for major devices and platforms including iPad, iPhone, Android, Mac, Kindle Fire, Kobo, Google Chrome, Safari, Firefox, Opera and Windows." (From: https://getpocket.com/about)


Vulnerability Description:
Pocket has a computer cyber security bug problem. Hacker can exploit it by CSRF attacks.

 "Cross-Site Request Forgery (CSRF) is an attack that forces an end user to execute unwanted actions on a web application in which they're currently authenticated. CSRF attacks specifically target state-changing requests, not theft of data, since the attacker has no way to see the response to the forged request. With a little help of social engineering (such as sending a link via email or chat), an attacker may trick the users of a web application into executing actions of the attacker's choosing. If the victim is a normal user, a successful CSRF attack can force the user to perform state changing requests like transferring funds, changing their email address, and so forth. If the victim is an administrative account, CSRF can compromise the entire web application." (OWSAP)


Tests were performed on Microsoft IE (9 9.0.8112.16421) of Windows 7, Mozilla Firefox (37.0.2) & Google Chromium 42.0.2311 (64-bit) of Ubuntu (14.04.2)，Apple Safari 6.1.6 of Mac OS X v10.9 Mavericks.



Vulnerability Details:
The code programming flaw exists at "https://getpocket.com/edit/edit" page, i.e.https://getpocket.com/edit?url=http%3A%2F%2Fwpshout.com%2Fchange-wordpress-theme-external-php&title=

Vulnerable URL:
https://getpocket.com/edit?url=http%3A%2F%2Fwpshout.com%2Fchange-wordpress-theme-external-php&title=


Use a website created by me for the following tests. The website is "http://itinfotech.tumblr.com/". Suppose that this website is malicious. If it contains the following link, attackers can post any message as they like.
<a href="https://getpocket.com/edit?url=http%3A%2F%2Fmake.wordpress.org%2Fcore%2F2014%2F01%2F15%2Fgit-mirrors-for-wordpress&title=csrf test">getpocket csrf test</a> [1]


When a logged victim clicks the link ([1]), a new item will be successfully saved to his/her "Pocket" without his/her notice. An attack happens.




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Thursday, 11 June 2015

6kbbs v8.0 Weak Encryption Cryptography Security Vulnerabilities




















6kbbs v8.0 Weak Encryption Cryptography Security Vulnerabilities


Exploit Title: 6kbbs Weak Encryption Web Security Vulnerabilities
Vendor: 6kbbs
Product: 6kbbs
Vulnerable Versions: v7.1   v8.0
Tested Version: v7.1   v8.0
Advisory Publication: June 08, 2015
Latest Update: June 10, 2015
Vulnerability Type: Inadequate Encryption Strength [CWE-326]
CVE Reference: *
CVSS Severity (version 2.0):
Discover and Reporter: Wang Jing [School of Physical and Mathematical Sciences (SPMS), Nanyang Technological University (NTU), Singapore] (@justqdjing)





Recommendation Details:


(1) Vendor & Product Description:


Vendor:
6kbbs



Product & Vulnerable Versions:
6kbbs
v7.1
v8.0



Vendor URL & download:
6kbbs can be gain from here,
http://www.6kbbs.com/download.html




Product Introduction Overview:
"6kbbs V8.0 is a PHP + MySQL built using high-performance forum, has the code simple, easy to use, powerful, fast and so on. It is an excellent community forum program. The program is simple but not simple; fast, small; Interface generous and good scalability; functional and practical pursuing superior performance, good interface, the user's preferred utility functions. Forum Technical realization (a) interface : using XHTML + CSS structure, so the structure of the page , easy to modify the interface ; save the transmission static page code , greatly reducing the amount of data transmitted over the network ; improve the interface scalability , more in line with WEB standards, support Internet Explorer, FireFox, Opera and other major browsers. (b) Program : The ASP + ACCESS mature technology , the installation process is extremely simple , the environment is also very common."


"(1) PHP version : (a) 6kbbs V8.0 start using PHP + MySQL architecture. (b) Currently ( July 2010 ) is still in the testing phase , 6kbbs V8.0 is the latest official release. (2) ASP Version: 6kbbs (6k Forum) is an excellent community forum process . The program is simple but not simple ; fast , small ; interface generous and good scalability ; functional and practical . pursue superiority , good interface , practical functions of choice for subscribers."





(2) Vulnerability Details:
6kbbs web application has a computer security problem. It can be exploited by weak encryption attacks. The software stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required. A weak encryption scheme can be subjected to brute force attacks that have a reasonable chance of succeeding using current attack methods and resources.


Several 6kbbs products 0-day web cyber bugs have been found by some other bug hunter researchers before. 6kbbs has patched some of them. "The Full Disclosure mailing list is a public forum for detailed discussion of vulnerabilities and exploitation techniques, as well as tools, papers, news, and events of interest to the community. FD differs from other security lists in its open nature and support for researchers' right to decide how to disclose their own discovered bugs. The full disclosure movement has been credited with forcing vendors to better secure their products and to publicly acknowledge and fix flaws rather than hide them. Vendor legal intimidation and censorship attempts are not tolerated here!" A great many of the web securities have been published here.




Source Code:
<?php
if(empty($row)){
        $extrow=$db->row_select_one("users","username='{$username}'");
        if(!empty($extrow) && !empty($extrow['salt'])){
                if(md5(md5($userpass).$extrow['salt'])==$extrow['userpass']){
                        $row=$extrow; 
                        $new_row["userpass"]=$userpass_encrypt;
                        $new_row["salt"]="";
                        $db->row_update("users",$new_row,"id={$extrow['id']}");
                }
        }
}
?>



Source Code From:
http://code.google.com/p/6kbbs/source/browse/trunk/convert/discuz72/loginext.php?r=16


We can see that "userpass" stored in cookie was encrypted using "$userpass" user password directly. And there is no "HttpOnly" attribute at all. Since md5 is used for the encryption, it is easy for hackers to break the encrypted message.


"The MD5 message-digest cryptography algorithm is a widely used cryptographic hash function producing a 128-bit (16-byte) hash value, typically expressed in text format as a 32 digit hexadecimal number. Papers about it have been published on Eurocrypt, Asiacrypt and Crypto. Meanwhile, researchers focusing on it spread in Computer Science, Computer Engineering, IEEE and Mathematics. MD5 has been utilized in a wide variety of cryptographic applications, and is also commonly used to verify data integrity. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function, MD4. The source code in RFC 1321 contains a "by attribution" RSA license." (Wikipedia)







References:
http://tetraph.com/security/weak-encryption/6kbbs-v8-0-weak-encryption/
http://www.inzeed.com/kaleidoscope/computer-security/6kbbs-v8-0-weak-encryption/
https://itswift.wordpress.com/2015/06/11/6kbbs-v8-0-weak-encryption/
http://marc.info/?l=full-disclosure&m=142821698311838&w=4
http://permalink.gmane.org/gmane.comp.security.fulldisclosure/1820
http://seclists.org/fulldisclosure/2015/Apr/13
https://packetstormsecurity.com/files/131290/6kbbs-8.0-Cross-Site-Request-Forgery.html
http://lists.openwall.net/full-disclosure/2015/04/05/6
https://www.mail-archive.com/fulldisclosure%40seclists.org/msg01903.html
http://cxsecurity.com/search/author/DESC/AND/FIND/0/10/Wang+Jing/
http://diebiyi.com/articles/security/6kbbs-v8-0-weak-encryption/
http://whitehatpost.blog.163.com/blog/static/24223205420155115152896/
http://webtechhut.blogspot.com/2015/06/6kbbs-weak-encryption.html
https://webtechwire.wordpress.com/2015/06/11/6kbbs-v8-0-weak-encryption/
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