CUPS: Stack overflow in included Xpdf code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200501-30 / CUPS
Release Date	January 22, 2005
Latest Revision	January 22, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-print/cups	< 1.1.23-r1	>= 1.1.23-r1	All supported architectures

Related bugreports: #78249

Synopsis

CUPS includes Xpdf code and therefore is vulnerable to the recent stack overflow issue, potentially resulting in the remote execution of arbitrary code.

2. Impact Information

Background

The Common UNIX Printing System (CUPS) is a cross-platform print spooler. It makes use of Xpdf code to handle PDF files.

Description

The Decrypt::makeFileKey2 function in Xpdf's Decrypt.cc insufficiently checks boundaries when processing /Encrypt /Length tags in PDF files (GLSA 200501-28).

Impact

This issue could be exploited by a remote attacker to execute arbitrary code by sending a malicious print job to a CUPS spooler.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All CUPS users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-print/cups-1.1.23-r1"

4. References

Updated January 22, 2005

Summary: This is a Gentoo Linux Security Advisory

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