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

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

Affected Packages

dev-libs/chmlib on all architectures
Affected versions < 0.39
Unaffected versions >= 0.39

Background

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

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:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-libs/chmlib-0.39"

References

Release Date
February 27, 2007

Latest Revision
May 20, 2008: 02

Severity
normal

Exploitable
remote

Bugzilla entries