OpenLDAP tls_o.c security bypass

openldap-tlso-security-bypass (53954) The risk level is classified as MediumMedium Risk

Description:

OpenLDAP could allow a remote attacker to bypass security restrictions, caused by the improper validation of a domain name in a signed CA certificate by tls_o.c. By creating a specially-crafted X.509 certificate signed by a trusted Certificate Authority (CA) containing NULL characters in the subject's Common Name (CN) field, a remote attacker could exploit this vulnerability using man-in-the-middle techniques to bypass security restrictions and cause the victim's client to accept spoofed SSL server certificates.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.3
  Exploitability: Unproven
  Remediation Level: Temporary-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Apply the patch for this vulnerability, available from the OpenLDAP CVS Repository. See References.

References:

  • OpenLDAP CVS Repository: OpenLDAP.
  • oss-security Mailing List, 2009-09-03 14:45:47: [oss-security] More CVE-2009-2408 like issues.
  • VMSA-2010-0015: VMware ESX third party updates for Service Console.
  • BID-36844: OpenLDAP X.509 Certificate NULL Character Certificate Validation Security Bypass Vulnerability
  • CVE-2009-3767: libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
  • DSA-1943: openldap2.3 -- insufficient input validation
  • MDVSA-2010:026: openldap
  • RHSA-2010-0198: Moderate: openldap security and bug fix update
  • RHSA-2010-0543: Moderate: openldap security update
  • SA41618: VMware ESX Server Service Console Multiple Vulnerabilities
  • USN-858-1: OpenLDAP vulnerability

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • Mandriva Enterprise Server 5
  • Mandriva Enterprise Server 5 X86_64
  • Mandriva Linux 2009.0 X86_64
  • Mandriva Linux 2009.0
  • Mandriva Linux 2009.1 X86_64
  • Mandriva Linux 2009.1
  • OpenLDAP OpenLDAP
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4.8.z AS
  • RedHat Enterprise Linux 4.8.z ES
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5

Reported:

Sep 03, 2009

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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