GnuTLS: Multiple vulnerabilities

Background

GnuTLS is an Open Source implementation of the TLS 1.0 and SSL 3.0 protocols.

Description

The following vulnerabilities were found in GnuTLS:

• Miroslav Kratochvil reported that lib/pk-libgcrypt.c does not properly handle corrupt DSA signatures, possibly leading to a double-free vulnerability (CVE-2009-1415).
• Simon Josefsson reported that GnuTLS generates RSA keys stored in DSA structures when creating a DSA key (CVE-2009-1416).
• Romain Francoise reported that the _gnutls_x509_verify_certificate() function in lib/x509/verify.c does not perform time checks, resulting in the “gnutls-cli” program accepting X.509 certificates with validity times in the past or future (CVE-2009-1417).

Impact

A remote attacker could entice a user or automated system to process a specially crafted DSA certificate, possibly resulting in a Denial of Service condition. NOTE: This issue might have other unspecified impact including the execution of arbitrary code. Furthermore, a remote attacker could spoof signatures on certificates and the “gnutls-cli” application can be tricked into accepting an invalid certificate.

Workaround

There is no known workaround at this time.

Resolution

All GnuTLS users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-libs/gnutls-2.6.6"