New worm Santy.A actively exploiting phpBB [closed]

[The Garner Family]

An urgent upgrade of the forum might be on the cards. I've patched my phpBB2 forums today.

See below Auscert.


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A U S C E R T A L E R T

AL-2004.044 -- AUSCERT ALERT
US-CERT TA04-356A
New worm Santy.A actively exploiting phpBB highlight
parameter vulnerability
22 December 2004

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AusCERT Alert Summary
---------------------

Product: phpBB 2.0.10 and prior
Publisher: US-CERT
Operating System: UNIX variants
Linux variants
Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated

Original Bulletin: http://www.us-cert.gov/cas/techalerts/TA04-356A.html

Comment: UNIX systems are actively being exploited by this worm.
Windows systems without Perl installed will not be infected
by this worm but are still vulnerable and may be affected by
other exploit code.

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Technical Cyber Security Alert TA04-356A
Exploitation of phpBB highlight parameter vulnerability

Original release date: December 21, 2004
Last revised: --
Source: US-CERT

Systems Affected

phpBB versions 2.0.10 and prior

Overview

The software phpBB contains an input validation problem in how it
processes a parameter contained in URLs. An intruder can deface a
phpBB website, execute arbitrary commands, or gain administrative
privileges on a compromised bulletin board.

I. Description

phpBB is an open-source bulletin board application. It fails to
properly perform an urldecode() on the "highlight" parameter supplied
to viewtopic.php. This may allow a remote attacker to execute
arbitrary commands on a vulnerable server.

According to reports, this vulnerability is being actively exploited
by the Santy.A worm. The worm appears to propogate by searching for
the keyword "viewtopic.php" in order to find vulnerable sites.

The worm writes itself to a file named "m1ho2of" on the compromised
system. It then overwrites files ending with .htm, .php, .asp. shtm,
.jsp, and .phtm replacing them with HTML content that defaces the web
page. The worm then tries to use PERL to execute itself on the
compromised system and propogate further.
US-CERT is tracking this issue as:

VU#497400 - phpBB viewtopic.php fails to properly sanitize input
passed to the "highlight" parameter

II. Impact

A remote attacker may be able to deface a phpBB website and execute
arbitrary commands on a compromised bulletin board.

III. Solution

Upgrade phpBB

Upgrade to phpBB verison 2.0.11 to prevent exploitation.

Appendix A. References

* US-CERT Vulnerability Note VU#497400 -
<http://www.kb.cert.org/vuls/id/497400>
* phpBB Downloads - < http://www.phpbb.com/downloads.php>
* phpBB Announcement -
<http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=240636>
* Symantec Security Response - Perl.Santy -
<http://securityresponse.symantec.com/av ... perl.santy
.html>
* McAfee - Computer Virus Software and Internet Security -
<http://us.mcafee.com/virusInfo/default. ... n&virus_k=
130471>
_________________________________________________________________

This vulnerability was reported by the phpBB Development Team.
_________________________________________________________________

Feedback can be directed to the authors: Jeffrey Gennari and
Jason Rafail
_________________________________________________________________

This document is available from:

<http://www.us-cert.gov/cas/techalerts/TA04-356A.html>

_________________________________________________________________

Copyright 2004 Carnegie Mellon University.

Terms of use: <http://www.us-cert.gov/legal.html>
_________________________________________________________________

Revision History

Dec 21, 2004: Initial release

Last updated December 21, 2004
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[The Garner Family]

Oh and don't forget to patch php at the same time as there is a vulnerability in that too. There is an active exploit for that that allows remote viewing of phpbb config files.

[ideology]

thanks
we patched phpbb accordance with http://www.securityfocus.com/advisories/7547

we upgraded php a week or so agao it but it didn't have that fix in it, so we'll check to see if a new one is out

[The Garner Family]

Down the bottom of the page it says: "Powered by phpBB 2.0.4 © 2001, 2002 phpBB Group"... which would seem to indicate that the patch might not have been completed... This can sometimes happen if you only patch the files and don't run the script to patch the DB.

[ideology]

we hand-patched it. we'll didn't realise the database needed changes. we'll take a more detailed look. thanks.