Public Vulnerability Reports

Oracle Internet Directory Pre-Authentication LDAP DoS Vulnerability



Internet Directory is Oracle's implementation of the Lightweight Directory Access Protocol (LDAP) v3 service. It is used in conjunction with Oracle Identity Management to implement user administration in the Oracle environment. More information can be found at the following URL.


Remote exploitation of a pre-authentication input validation vulnerability in Oracle Corp.'s Oracle Internet Directory allows an attacker to conduct a denial of service attack on a vulnerable host.

Internet Directory consists of two processes. One process acts as a listener. It handles incoming connections and passes them off to the second process. The second process, which handles requests, contains the vulnerability.

When processing a malformed LDAP request, it is possible to cause the handler to dereference a NULL pointer. This results in the process crashing. Future connection requests will be accepted by the listener process, and then immediately closed when it finds that there is no handler process running.


Exploitation of this vulnerability allows an attacker to deny service to legitimate users of the directory server. In order to exploit this issue, an attacker must be able to establish an LDAP session with the vulnerable server. This is typically done via TCP port 389 or the SSL-enabled TCP port 636. No authentication is needed. In order to restore functionality, the listener process must be stopped and restarted.


iDefense confirmed the existence of this vulnerability in Oracle Internet Directory for Windows version with the April 2007 CPU installed. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


Oracle Corp. has addressed this vulnerability with the release of their July 2008 Critical Patch Update. For more information, visit the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-2595 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


05/11/2007 Initial vendor notification
05/11/2007 Initial vendor response
07/15/2008 Coordinated public disclosure


This vulnerability was reported to iDefense by Joxean Koret.

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