GnuTLS libgnutls denial of service

gnutls-libgnutls-dos (50445) The risk level is classified as MediumMedium Risk

Description:

GnuTLS is vulnerable to a denial of service, caused by the improper handling of invalid DSA signatures by lib/pk-libgcrypt.c within libgnutls. A remote attacker could exploit this vulnerability using a specially-crafted DSA key that triggers a free of an uninitialized pointer or a double free to cause the application to crash.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of GnuTLS (2.6.6 or later), available from the GNU TLS Library Project Web site. See References.

References:

  • GNU TLS Library Project Web site: The GNU Transport Layer Security Library .
  • gnutls-devel Mailing List, 2009-04-30 10:36:31 GMTT: Double free and free of invalid pointer on certain errors [GNUTLS-SA-2009-1].
  • BID-34783: GnuTLS Prior to 2.6.6 Multiple Remote Vulnerabilities
  • CVE-2009-1415: lib/pk-libgcrypt.c in libgnutls in GnuTLS before 2.6.6 does not properly handle invalid DSA signatures, which allows remote attackers to cause a denial of service (application crash) and possibly have unspecified other impact via a malformed DSA key that triggers a (1) free of an uninitialized pointer or (2) double free.
  • GLSA-200905-04: GnuTLS: Multiple vulnerabilities
  • MDVSA-2009:116: gnutls
  • SA34842: GnuTLS Multiple Vulnerabilities
  • SECTRACK ID: 1022157: GnuTLS Bug in Validating DSA Signatures Lets Remote Users Deny Service
  • VUPEN/ADV-2009-1218: GnuTLS Key and Certificate Handling Double Free and DoS Vulnerabilities

Platforms Affected:

  • Gentoo Linux
  • GNU GnuTLS 2.6.0
  • GNU GnuTLS 2.6.1
  • GNU GnuTLS 2.6.2
  • GNU GnuTLS 2.6.3
  • GNU GnuTLS 2.6.4
  • GNU GnuTLS 2.6.5
  • MandrakeSoft Mandrake Linux 2008.1 X86_64
  • MandrakeSoft Mandrake Linux 2008.1
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • Mandriva Linux 2009.0
  • Mandriva Linux 2009.0 X86_64
  • Mandriva Linux 2009.1 X86_64
  • Mandriva Linux 2009.1

Reported:

Apr 30, 2009

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