nss_ldap: Information disclosure

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200711-33 / nss_ldap
Release Date	November 25, 2007
Latest Revision	November 25, 2007: 01
Impact	low
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
sys-auth/nss_ldap	< 258	>= 258	All supported architectures

Related bugreports: #198390

Synopsis

A race condition might lead to theft of user credentials or information disclosure in services using nss_ldap.

2. Impact Information

Background

nss_ldap is a Name Service Switch module which allows 'passwd', 'group' and 'host' database information to be pulled from LDAP.

Description

Josh Burley reported that nss_ldap does not properly handle the LDAP connections due to a race condition that can be triggered by multi-threaded applications using nss_ldap, which might lead to requested data being returned to a wrong process.

Impact

Remote attackers could exploit this race condition by sending queries to a vulnerable server using nss_ldap, possibly leading to theft of user credentials or information disclosure (e.g. Dovecot returning wrong mailbox contents).

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All nss_ldap users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-auth/nss_ldap-258"

4. References

CVE-2007-5794

Updated November 25, 2007

Summary: This is a Gentoo Linux Security Advisory

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