Fedora SSSD LDAP security bypass

sssd-ldap-security-bypass (61399) The risk level is classified as MediumMedium Risk

Description:

Fedora SSSD could allow a remote attacker to bypass security restrictions, caused by an error when authenticating against an LDAP server via a service that uses pam_authenticate. If the LDAP server allows unauthenticated binds, a remote attacker could send an empty password to bypass security restrictions to gain unauthorized access to the victim?s account.

*CVSS:

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

Consequences:

Bypass Security

Remedy:

Apply the patch for this vulnerability, available from the SSSD Trac Repository. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • Red Hat Bugzilla Bug 625189 : CVE-2010-2940 sssd: allows null password entry to authenticate against LDAP.
  • SSSD Trac Repository: SSSD.
  • SSSD Web site: SSSD - System Security Services Daemon.
  • BID-42757: Fedora SSSD LDAP Unauthenticated Bind Security Bypass Vulnerability
  • CVE-2010-2940: The auth_send function in providers/ldap/ldap_auth.c in System Security Services Daemon (SSSD) 1.3.0, when LDAP authentication and anonymous bind are enabled, allows remote attackers to bypass the authentication requirements of pam_authenticate via an empty password.
  • OSVDB ID: 67571: SSSD LDAP Server pam_authenticate Unauthenticated Bind Null Password Authentication Bypass
  • SA41159: SSSD LDAP Unauthenticated Bind Security Bypass Security Issue

Platforms Affected:

  • RedHat SSSD 1.3.0

Reported:

Aug 26, 2010

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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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