[ GLSA 200702-12 ] CHMlib: User-assisted remote execution of arbitrary code

[GLSA]

Gentoo Linux Security Advisory

Title: CHMlib: User-assisted remote execution of arbitrary code (GLSA 200702-12)
Severity: normal
Exploitable: remote
Date: February 27, 2007
Updated: May 20, 2008
Bug(s): #163989
ID: 200702-12

Synopsis


A memory corruption vulnerability in CHMlib could lead to the remote
execution of arbitrary code.


Background


CHMlib is a library for the MS CHM (Compressed HTML) file format plus
extracting and HTTP server utils.


Affected Packages

Package: dev-libs/chmlib
Vulnerable: < 0.39
Unaffected: >= 0.39
Architectures: All supported architectures


Description


When certain CHM files that contain tables and objects stored in pages
are parsed by CHMlib, an unsanitized value is passed to the alloca()
function resulting in a shift of the stack pointer to arbitrary memory
locations.


Impact


An attacker could entice a user to open a specially crafted CHM file,
resulting in the execution of arbitrary code with the permissions of
the user viewing the file.


Workaround


There is no known workaround at this time.


Resolution


All CHMlib users should upgrade to the latest version: