[NEWS] Oracle Internet Directory Pre-Authentication LDAP DoS Vulnerability

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Oracle Internet Directory Pre-Authentication LDAP DoS Vulnerability
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SUMMARY

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". 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.

DETAILS

Vulnerable Systems:
* Oracle Internet Directory for Windows version 10.1.4.0.1 with the April
2007 CPU installed

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.

Analysis:
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.

Vendor response:
Oracle Corp. has addressed this vulnerability with the release of their
July 2008 Critical Patch Update. For more information, visit the following
URL:
<http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpujul2008.html> http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpujul2008.html

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2595>
CVE-2008-2595

Disclosure timeline:
05/11/2007 - Initial vendor notification
05/11/2007 - Initial vendor response
07/15/2008 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by
<mailto:idlabs-advisories@xxxxxxxxxxxx> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=725>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=725



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