GLSA 200508-22: pam_ldap: Authentication bypass vulnerability

http://security.gentoo.org/

Severity:	normal
Title:	pam_ldap: Authentication bypass vulnerability
Date:	08/31/2005
Bugs:	#103659
ID:	200508-22

Synopsis

pam_ldap contains a vulnerability that may allow a remote attacker to gain system access.

Background

pam_ldap is a Pluggable Authentication Module which allows authentication against LDAP directories.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-auth/pam_ldap	< 180	>= 180	All supported architectures

Description

When a pam_ldap client attempts to authenticate against an LDAP server that omits the optional error value from the PasswordPolicyResponseValue, the authentication attempt will always succeed.

Impact

A remote attacker may exploit this vulnerability to bypass the LDAP authentication mechanism, gaining access to the system possibly with elevated privileges.

Workaround

There is no known workaround at this time.

Resolution

All pam_ldap users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-180"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200508-22.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.