View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-0438 high priority: Ubuntu including 1 source packages (nss-pam-ldapd), 6 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): DNE 3, not-affected 2, released 1.
nslcd/pam.c in the nss-pam-ldapd 0.8.0 PAM module returns a success code when a user is not found in LDAP, which allows remote attackers to bypass authentication.