[UNIX] log4sh Insecure Temporary Files Creation Vulnerability

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html

- - - - - - - - -

log4sh Insecure Temporary Files Creation Vulnerability
------------------------------------------------------------------------

SUMMARY

" <http://forestent.com/products/log4sh/> Log4sh runs along the same lines
as the other excellent logging services from the Apache Software
Foundation. It adds to that list the ability to integrate powerful
logging capabilities into a shell script."

log4sh creates temporally files in an insecure way allowing local
attackers to gain elevated privileges.

DETAILS

Vulnerable Systems:
* log4sh versions 1.2.5 and prior

The vulnerability is caused due to temporary files being created
insecurely. This can be exploited via a symlink attack, and in turn create
and/or overwrite arbitrary files with the privileges of the user running
the affected script.

Vulnerable code:
356 log4sh_readProperties()
357 {
358 _file=$1
359
360 _tmpFile="/tmp/log4sh.$$"
361 grep "^log4sh\." $_file >$_tmpFile

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1915>
CAN-2005-1915

Disclosure Timeline:
26.05.05 - Discovered
09.06.05 - Vendor notified
27.06.05 - No response, Vendor Sec report (vendor-sec@lst.de)
04.07.05 - Disclosure

ADDITIONAL INFORMATION

The original article can be found at:
<http://www.zataz.net/adviso/log4sh-06092005.txt>
http://www.zataz.net/adviso/log4sh-06092005.txt
Gentoo Bugs Reports: <http://bugs.gentoo.org/show_bug.cgi?id=94069 >
http://bugs.gentoo.org/show_bug.cgi?id=94069

========================================

This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@securiteam.com

====================
====================

DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.