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[ GLSA 200612-19 ] pam_ldap: Authentication bypass vulnerability
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PostPosted: Wed Dec 20, 2006 9:26 pm    Post subject: [ GLSA 200612-19 ] pam_ldap: Authentication bypass vulnerabi Reply with quote

Gentoo Linux Security Advisory

Title: pam_ldap: Authentication bypass vulnerability (GLSA 200612-19)
Severity: low
Exploitable: remote
Date: December 20, 2006
Bug(s): #153916
ID: 200612-19

Synopsis

pam_ldap contains a vulnerability that may allow a remote user with a locked account to gain unauthorized system access.

Background

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

Affected Packages

Package: sys-auth/pam_ldap
Vulnerable: < 183
Unaffected: >= 183
Architectures: All supported architectures


Description

Steve Rigler discovered that pam_ldap does not correctly handle "PasswordPolicyResponse" control responses from an LDAP directory. This causes the pam_authenticate() function to always succeed, even if the previous authentication failed.

Impact

A locked user may exploit this vulnerability to bypass the LDAP authentication mechanism, possibly gaining unauthorized access to the system.

Workaround

There is no known workaround at this time.

Resolution

All pam_ldap users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-183"


References

CVE-2006-5170
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