libtasn1, GNU TLS: Security flaw in DER decoding

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200602-08 / libtasn1
Release Date	February 16, 2006
Latest Revision	February 16, 2006: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	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

Related bugreports: #122307

Synopsis

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

2. Impact Information

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.

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All libtasn1 users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

All GNU TLS users should upgrade to the latest version:

Code Listing 3.2: Resolution

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

4. References

CVE-2006-0645

Page updated February 16, 2006

Summary: This is a Gentoo Linux Security Advisory

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