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[ GLSA 200501-02 ] a2ps: Multiple vulnerabilities
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GLSA
Bodhisattva
Bodhisattva


Joined: 17 Nov 2002
Posts: 6377
Location: Graz / EU

PostPosted: Tue Jan 04, 2005 11:18 pm    Post subject: [ GLSA 200501-02 ] a2ps: Multiple vulnerabilities Reply with quote

Gentoo Linux Security Advisory

Title: a2ps: Multiple vulnerabilities (GLSA 200501-02)
Severity: normal
Exploitable: local and remote
Date: January 04, 2005
Updated: May 22, 2006
Bug(s): #75784, #61500
ID: 200501-02

Synopsis


The fixps and psmandup scripts in the a2ps package are vulnerable to
symlink attacks, potentially allowing a local user to overwrite arbitrary
files. A vulnerability in a2ps filename handling could also result in
arbitrary command execution.


Background


a2ps is an Any to Postscript filter that can convert to Postscript from
many filetypes. fixps is a script that fixes errors in Postscript
files. psmandup produces a Postscript file for printing in manual
duplex mode.


Affected Packages

Package: app-text/a2ps
Vulnerable: < 4.13c-r2
Unaffected: >= 4.13c-r2
Architectures: All supported architectures


Description


Javier Fernandez-Sanguino Pena discovered that the a2ps package
contains two scripts that create insecure temporary files (fixps and
psmandup). Furthermore, we fixed in a previous revision a vulnerability
in a2ps filename handling (CAN-2004-1170).


Impact


A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
fixps or psmandup is executed, this would result in the file being
overwritten with the rights of the user running the utility. By
enticing a user or script to run a2ps on a malicious filename, an
attacker could execute arbitrary commands on the system with the rights
of that user or script.


Workaround


There is no known workaround at this time.


Resolution


All a2ps users should upgrade to the latest version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/a2ps-4.13c-r2"


References

Secunia SA13641
CAN-2004-1170
CVE-2004-1377
Full-Disclosure Advisory


Last edited by GLSA on Wed Sep 25, 2013 4:18 am; edited 6 times in total
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