zlib: Buffer overflow — GLSA 200507-05

A buffer overflow has been discovered in zlib, potentially resulting in the execution of arbitrary code.

Affected Packages

sys-libs/zlib on all architectures
Affected versions < 1.2.2-r1
Unaffected versions >= 1.2.2-r1

Background

zlib is a widely used free and patent unencumbered data compression library.

Description

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered a buffer overflow in zlib. A bounds checking operation failed to take invalid data into account, allowing a specifically malformed deflate data stream to overrun a buffer.

Impact

An attacker could construct a malformed data stream, embedding it within network communication or an application file format, potentially resulting in the execution of arbitrary code when decoded by the application using the zlib library.

Workaround

There is no known workaround at this time.

Resolution

All zlib users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-libs/zlib-1.2.2-r1"

References

Release Date
July 06, 2005

Latest Revision
July 06, 2005: 01

Severity
high

Exploitable
remote

Bugzilla entries