Vulnerability Note VU#276944

iPlanet Directory Server contains multiple vulnerabilities in LDAP handling code

Overview

The iPlanet Directory Server contains vulnerabilities that may allow denial-of-service attacks, unauthorized privileged access, or both. These vulnerabilities were revealed using the PROTOS LDAPv3 test suite and are documented in CERT Advisory CA-2001-18. If your site uses this product, the CERT/CC encourages you to follow the advice provided below.

I. Description

The iPlanet Directory Server contains multiple vulnerabilities in the code that processes LDAP requests.

In the encoding section of the test suite, this product had an indeterminate number of failures in the group that tests invalid BER length of length fields.

In the application section of the test suite, this product failed four groups and had inconclusive results for an additional five groups. The four failed groups indicate the presence of buffer overflow vulnerabilities. For the inconclusive groups, the product exhibited suspicious behavior while testing for format string vulnerabilities.

II. Impact

One or more of these vulnerabilities allow a remote attacker to execute arbitrary code with the privileges of the Directory Server. The server typically runs with system privileges. At least one of these vulnerabilities has been successfully exploited in a laboratory environment under Windows NT 4.0, but they may affect other platforms as well.

III. Solution

Apply a patch from your vendor

Please consult the Systems Affected section for vendor-specific information on addressing this vulnerability.

Block access to directory services at network perimeter

As a temporary measure, it is possible to limit the scope of these vulnerabilities by blocking access to directory services at the network perimeter. Please note that this workaround does not protect vulnerable products from internal attacks.

ldap 389/tcp # Lightweight Directory Access Protocol
ldap 389/udp # Lightweight Directory Access Protocol
ldaps 636/tcp # ldap protocol over TLS/SSL (was sldap)
ldaps 636/udp # ldap protocol over TLS/SSL (was sldap)

Systems Affected

Vendor	Status	Date Updated
iPlanet	Vulnerable	27-Jul-2001
SGI	Vulnerable	10-Dec-2001

References

http://www.ee.oulu.fi/research/ouspg/protos/testing/c06/ldapv3/
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1306
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1307
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1308
http://www.securityfocus.com/bid/3038
http://www.securityfocus.com/bid/3039
http://xforce.iss.net/static/6893.php
http://xforce.iss.net/static/6898.php
http://ciac.llnl.gov/ciac/bulletins/l-116.shtml

Credit

The CERT Coordination Center thanks the Oulu University Secure Programming Group for reporting these vulnerabilities to us, for their detailed technical analyses, and for their assistance in preparing this document.

This document was written by Jeffrey P. Lanza.

Other Information

Date Public	07/16/2001
Date First Published	07/16/2001 11:36:51 PM
Date Last Updated	12/12/2002
CERT Advisory	CA-2001-18
CVE-ID(s)	CAN-2001-1306
NVD-ID(s)	CAN-2001-1306
US-CERT Technical Alerts
Metric	18.70
Document Revision	39

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