zlib: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200507-19 / zlib
Release Date	July 22, 2005
Latest Revision	July 22, 2005: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
sys-libs/zlib	< 1.2.3	>= 1.2.3	All supported architectures

Related bugreports: #99751

Synopsis

zlib is vulnerable to a buffer overflow which could potentially lead to execution of arbitrary code.

2. Impact Information

Background

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

Description

zlib improperly handles invalid data streams which could lead to a buffer overflow.

Impact

By creating a specially crafted compressed data stream, attackers can overwrite data structures for applications that use zlib, resulting in arbitrary code execution or a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All zlib users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-libs/zlib-1.2.3"

4. References

Page updated July 22, 2005

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.