[ GLSA 200501-28 ] Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2

[GLSA]

Gentoo Linux Security Advisory

Title: Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2 (GLSA 200501-28)
Severity: normal
Exploitable: remote
Date: January 21, 2005
Bug(s): #77888, #78128
ID: 200501-28

Synopsis

A stack overflow was discovered in Xpdf, potentially resulting in the execution of arbitrary code. GPdf includes Xpdf code and therefore is vulnerable to the same issue.

Background

Xpdf is an open source viewer for Portable Document Format (PDF) files. GPdf is a Gnome-based PDF viewer that includes some Xpdf code.

Affected Packages

Package: app-text/xpdf
Vulnerable: <= 3.00-r7
Unaffected: >= 3.00-r8
Architectures: All supported architectures

Package: app-text/gpdf
Vulnerable: < 2.8.2
Unaffected: >= 2.8.2
Architectures: All supported architectures


Description

iDEFENSE reports that the Decrypt::makeFileKey2 function in Xpdf's Decrypt.cc insufficiently checks boundaries when processing /Encrypt /Length tags in PDF files.

Impact

An attacker could entice an user to open a specially-crafted PDF file which would trigger a stack overflow, potentially resulting in execution of arbitrary code with the rights of the user running Xpdf or GPdf.

Workaround

There is no known workaround at this time.

Resolution

All Xpdf users should upgrade to the latest version: