From: ZATAZ Audits (exploitszataz.net)
Date: Tue Jul 05 2005 - 06:20:20 CDT

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kpopper insecure temporary file creation

Vendor: http://kpopper.sourceforge.net/
Advisory: http://www.zataz.net/adviso/kpopper-06152005.txt
Vendor informed: yes
Exploit available: yes
Impact : low
Exploitation : low

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The vulnerability is caused due to temporary file being created insecurely.
This can be exploited via symlink attacks in combination to create and
overwrite arbitrary files with the privileges of the user running the
affected script.

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Versions:
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kpopper <= 1.0

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Solution:
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To prevent symlink attack use kernel patch such as grsecurity

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Timeline:
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Discovered : 2005-06-13
Vendor notified : 2005-06-15
Vendor response : no reponse
Vendor fix : no fix
Vendor Sec report (vendor-seclst.de) : 2005-06-27
Disclosure : 2005-07-04

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Technical details :
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Vulnerable code :
-----------------

popper/popper-send.sh

#!/bin/sh
echo "$2" > /tmp/.popper-new
echo `date +"%a %l:%m %p"` >> /tmp/.popper-new
cat "$1" >> /tmp/.popper-new
mv -f /tmp/.popper-new /tmp/.popper

The .popper is also used into :

popper/popper.cpp

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Related :
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Bug report : http://bugs.gentoo.org/show_bug.cgi?id=94475
CVE : CAN-2005-1917

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Credits :
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Eric Romang (eromangzataz.net - ZATAZ Audit)
Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, etc.)

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