Libtasn1: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201209-12 / libtasn1
Release Date	September 25, 2012
Latest Revision	September 25, 2012: 1
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-libs/libtasn1	< 2.12	>= 2.12	All supported architectures

Related bugreports: #409031

Synopsis

A vulnerability in Libtasn1 might cause a Denial of Service condition.

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.

Description

Libtasn1 does not properly handle length fields when performing DER decoding.

Impact

A remote attacker could entice a user to open a specially crafted DER-encoded object in an application linked against Libtasn1, possibly resulting in Denial of Service.

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/libtasn1-2.12"

Packages which depend on this library may need to be recompiled. Tools such as revdep-rebuild may assist in identifying some of these packages.

4. References

CVE-2012-1569

Page updated September 25, 2012

Summary: This is a Gentoo Linux Security Advisory

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