[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:[email protected]> 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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