GnuTLS: Denial of Service vulnerability

Security Team Contact Address

Updated May 09, 2005

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200505-04 / GnuTLS
Release Date	May 09, 2005
Latest Revision	May 09, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-libs/gnutls	< 1.2.3	>= 1.2.3, revision >= 1.0.25	All supported architectures

Related bugreports: #90726

Synopsis

The GnuTLS library is vulnerable to Denial of Service attacks.

2. Impact Information

Background

GnuTLS is a free TLS 1.0 and SSL 3.0 implementation for the GNU project.

Description

A vulnerability has been discovered in the record packet parsing in the GnuTLS library. Additionally, a flaw was also found in the RSA key export functionality.

Impact

A remote attacker could exploit this vulnerability and cause a Denial of Service to any application that utilizes the GnuTLS library.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All GnuTLS users should remove the existing installation and upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --unmerge gnutls
# emerge --ask --oneshot --verbose net-libs/gnutls

Due to small API changes with the previous version, please do the following to ensure your applications are using the latest GnuTLS that you just emerged.

Code Listing 3.2: Resolution

# revdep-rebuild --soname-regexp libgnutls.so.1[0-1]

Previously exported RSA keys can be fixed by executing the following command on the key files:

Code Listing 3.3: Resolution

# certtool -k infile outfile

4. References