[UNIX] ncompress Insecure Temporary File Creation

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ncompress Insecure Temporary File Creation
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SUMMARY

"ncompress implement a fast, simple LZW file compression algorithm."
ncompress creates a temporary file with a file name that can be easily
guessed, this allows local attackers perform on it a symbolic link attack.

DETAILS

Vulnerable Systems:
* ncompress version 4.2.4-r1 and prior

ncompress creates temporary files in an insecure manner in the script
files of "gzexe.in", "zdiff.in", and "znew.in". An attacker can create a
race condition using a symbolic link attack and overwrite arbitrary files
on the system with the privileges of the user that executing the scripts.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0970>
CAN-2004-0970

ADDITIONAL INFORMATION

The information has been provided by <mailto:exploits@zataz.net> ZATAZ
Audits .
The original article can be found at:
<http://www.zataz.net/adviso/ncompress-09052005.txt>
http://www.zataz.net/adviso/ncompress-09052005.txt

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