GLSA 200602-08: libtasn1, GNU TLS: Security flaw in DER decoding

http://security.gentoo.org/

Severity:	high
Title:	libtasn1, GNU TLS: Security flaw in DER decoding
Date:	02/16/2006
Bugs:	#122307
ID:	200602-08

Synopsis

A flaw in the parsing of Distinguished Encoding Rules (DER) has been discovered in libtasn1, potentially resulting in the execution of arbitrary code.

Background

Libtasn1 is a library used to parse ASN.1 (Abstract Syntax Notation One) objects, and perform DER (Distinguished Encoding Rules) decoding. Libtasn1 is included with the GNU TLS library, which is used by applications to provide a cryptographically secure communications channel.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/libtasn1	< 0.2.18	>= 0.2.18	All supported architectures
net-libs/gnutls	< 1.2.10	>= 1.2.10	All supported architectures

Description

Evgeny Legerov has reported a flaw in the DER decoding routines provided by libtasn1, which could cause an out of bounds access to occur.

Impact

A remote attacker could cause an application using libtasn1 to crash and potentially execute arbitrary code by sending specially crafted input.

Workaround

There is no known workaround at this time.

Resolution

All libtasn1 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/libtasn1-0.2.18"

All GNU TLS users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-libs/gnutls-1.2.10"

References

CVE-2006-0645

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200602-08.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.