Advisory ID: HTB23092
Product: Serendipity
Vendor: Serendipity Team
Vulnerable Version(s): 1.6.1 and probably prior
Tested Version: 1.6.1
Vendor Notification: 16 May 2012 
Vendor Patch: 16 May 2012 
Public Disclosure: 6 June 2012 
Vulnerability Type: SQL injection
CVE Reference: CVE-2012-2762
CVSSv2 Base Score: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Solution Status: Fixed by Vendor
Risk Level: High 
Credit: High-Tech Bridge SA Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in Serendipity, which can be exploited to perform SQL injection attacks.


1) SQL injection in Serendipity

1.1 Input passed via the "url"  GET parameter to comment.php is not properly sanitised before being used in a SQL query.
This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

The following PoC (Proof of Concept) demonstrates the vulnerability:

http://[host]/comment.php?type=trackback&entry_id=1&url=%27%20OR%20mid%28version%28%29,1,1%29=5%20--%202

Successful exploitation of this vulnerability requires that "magic_quotes_gpc" is off.


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Solution:

Upgrade to Serendipity 1.6.2

More Information:
http://blog.s9y.org/archives/241-Serendipity-1.6.2-released.html
https://github.com/s9y/Serendipity/commit/87153991d06bc18fe4af05f97810487c4a340a92#diff-1

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References:

[1] High-Tech Bridge Advisory HTB23092 - https://www.htbridge.com/advisory/HTB23092 - SQL injection in Serendipity.
[2] Serendipity - http://s9y.org/ - PHP-powered, flexible Blogging/CMS application.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.

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Disclaimer: The information provided in this Advisory is provided "as is" and without any warranty of any kind. Details of this Advisory may be updated in order to provide as accurate information as possible. The latest version of the Advisory is available on web page [1] in the References.