Multiple memory leaks in Red Hat Directory Server 7.1 before SP7, Red Hat Directory Server 8, and Fedora Directory Server 1.1.1 and earlier allow remote attackers to cause a denial of service (memory consumption) via vectors involving (1) the authentication / bind phase and (2) anonymous LDAP search requests.

A flaw was found in a Accept Language HTTP header parsers implemented in adminutil library used by various Red Hat Directory Server's Administration Server's CGI scripts. A remote attacker able to connect to Administration Server web interface could cause a CGI scripts to crash, or possibly execute an arbitrary code.

Issue affects: - Red Hat Directory Server 7.1 - adminutil packages shipped in Red Hat Directory Server 8 and Fedora Directory Server, prior to adminutil version 1.1.7

It was discovered that Red Hat Directory Server and Fedora Directory Server is prone to a temporary denial of service attack (high CPU usage) via crafted LDAP search patterns. LDAP search patterns are internally translated to regular expressions. If the regular expression is matched against specially crafted record already stored in the LDAP, it may cause regular expression NFA to iterate over large amount of states, causing one slapd thread to occupy CPU for excessive amount of time.

Additionally, due to a current design of the regular expression handling code, only one slapd thread can execute regular expression NFA code at the time. Because of that, during the processing of such CPU intensive search request, all other search requests using patterns are blocked.

Affected version: Red Hat Directory Server 7.1 and 8 Fedora Directory Server 1.1.1

It was discovered that multiple CGI scripts used by Red Hat / Fedora Directory Server did not properly sanitize %-escaped inputs, resulting in a possibility to conduct cross-site scripting (XSS) attacks.

Issue was caused by a flow in an adminutil library that contain common functionality used by multiple CGI scripts, such as affected GET / POST argument parsing.

Issue is know to affect some Administration Express scripts and Directory Server Gateway (DSGW) scripts.

Affected version: Red Hat Directory Server 7.1 Red Hat Directory Server 8 (flaw limited to Administration Express issues, as DSGW component is not shipped) Fedora Directory Server

Buffer overflow in the regular expression handler in Red Hat Directory Server 8.0 and 7.1 before SP6 allows remote attackers to cause a denial of service (slapd crash) and possibly execute arbitrary code via a crafted LDAP query that triggers the overflow during translation to a regular expression.