A race condition might lead to theft of user credentials or information disclosure in services using nss_ldap.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-auth/nss_ldap | * | < 258 | >= 258 |
nss_ldap is a Name Service Switch module which allows 'passwd', 'group' and 'host' database information to be pulled from LDAP.
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.
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).
There is no known workaround at this time.
All nss_ldap users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-auth/nss_ldap-258"
pam_ldap and nss_ldap fail to restart TLS when following a referral, possibly leading to credentials being sent in plain text.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-auth/nss_ldap | * | < 239-r1 | >= 239-r1, >= 226-r1 (revision) |
| sys-auth/pam_ldap | * | < 178-r1 | >= 178-r1 |
pam_ldap is a Pluggable Authentication Module which allows authentication against an LDAP directory. nss_ldap is a Name Service Switch module which allows 'passwd', 'group' and 'host' database information to be pulled from LDAP. TLS is Transport Layer Security, a protocol that allows encryption of network communications.
Rob Holland of the Gentoo Security Audit Team discovered that pam_ldap and nss_ldap fail to use TLS for referred connections if they are referred to a master after connecting to a slave, regardless of the "ssl start_tls" ldap.conf setting.
An attacker could sniff passwords or other sensitive information as the communication is not encrypted.
pam_ldap and nss_ldap can be set to force the use of SSL instead of TLS.
All pam_ldap users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-178-r1"
All nss_ldap users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose sys-auth/nss_ldap