[UNIX] log4sh Insecure Temporary Files Creation Vulnerability

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  log4sh Insecure Temporary Files Creation Vulnerability
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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 ([email protected])
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 



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