GLSA 200507-05: zlib: Buffer overflow

http://security.gentoo.org/

Severity:	high
Title:	zlib: Buffer overflow
Date:	07/06/2005
Bugs:	#98121
ID:	200507-05

Synopsis

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

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-libs/zlib	< 1.2.2-r1	>= 1.2.2-r1	All supported architectures

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

CAN-2005-2096

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200507-05.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.