[ GLSA 200905-04 ] GnuTLS: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: GnuTLS: Multiple vulnerabilities (GLSA 200905-04)
Severity: normal
Exploitable: remote
Date: May 24, 2009
Bug(s): #267774
ID: 200905-04

Synopsis


Multiple vulnerabilities in GnuTLS might result in a Denial of Service,
spoofing or the generation of invalid keys.


Background


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


Affected Packages

Package: net-libs/gnutls
Vulnerable: < 2.6.6
Unaffected: >= 2.6.6
Architectures: All supported architectures


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: