Vulnerability Note VU#505564

IBM SecureWay Directory is vulnerable to denial-of-service attacks via LDAP handling code

Overview

The IBM SecureWay Directory 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 IBM SecureWay Directory server contains one or more buffer overflow vulnerabilities in the code that processes LDAP requests. These vulnerabilities were discovered independently by IBM using the PROTOS LDAPv3 test suite.

II. Impact

These vulnerabilities allow a remote attacker to crash affected SecureWay Directory servers, resulting in a denial-of-service condition. It is not known at this time whether these vulnerabilities will allow a remote attacker to execute arbitrary code. These vulnerabilities exist on the Solaris and Windows 2000 platforms but are not present under Windows NT, AIX, and AIX with SSL.

III. Solution

Apply a patch from your vendor

Please consult the vendor 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 Notified	Date Updated
IBM	Vulnerable	20-May-2002

References

http://www.ee.oulu.fi/research/ouspg/protos/testing/c06/ldapv3/
http://www.securityfocus.com/bid/3040
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1309
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1310
http://ciac.llnl.gov/ciac/bulletins/l-116.shtml
http://xforce.iss.net/static/6894.php

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:	2001-07-16
Date First Published:	2001-07-16
Date Last Updated:	2002-12-12
CERT Advisory:	CA-2001-18
CVE-ID(s):	CAN-2001-1309
NVD-ID(s):	CAN-2001-1309
US-CERT Technical Alerts:
Metric:	4.96
Document Revision:	36

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