J-Security Center

Title: PADL Software PAM_LDAP Authentication Bypass Vulnerability

Severity: HIGH

Description:

PAM_LDAP is the PAM module package designed to allow authentication with LDAP servers via PAM-compliant authentication mechanisms. It is available for UNIX and Linux platforms. Transport Layer Security (TLS) is the successor to Secure Sockets Layer (SSL) and provides encryption between communicating applications.

PAM_LDAP is prone to an authentication-bypass vulnerability. When handling new password policy control, if the LDAP server returns a passwordPolicyResponse control in a BindResponse without the optional 'error' field, PAM_LDAP will not fall through to the account management module. Successful exploitation could allow an unauthorized user to bypass authentication.

This vulnerability was reported to affect PAM_LDAP builds 169 through 179.

Affected Products:

  • Conectiva Linux 10.0.0
  • Gentoo Linux
  • MandrakeSoft Linux Mandrake 10.1.0
  • MandrakeSoft Linux Mandrake 10.1.0 x86_64
  • MandrakeSoft Linux Mandrake 10.2.0
  • MandrakeSoft Linux Mandrake 10.2.0 x86_64
  • PADL Software pam_ldap Build 169
  • PADL Software pam_ldap Build 179
  • RedHat Desktop 4.0.0
  • RedHat Enterprise Linux AS 4
  • RedHat Enterprise Linux ES 4
  • RedHat Enterprise Linux WS 4
  • SGI Advanced Linux Environment 3.0.0
  • Ubuntu Ubuntu Linux 5.0.0 4 amd64
  • Ubuntu Ubuntu Linux 5.0.0 4 i386
  • Ubuntu Ubuntu Linux 5.0.0 4 powerpc
  • rPath rPath Linux 1

References:

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