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CERT Coordination Center

Lotus Domino R5 Server Family contains multiple vulnerabilities in LDAP handling code

Vulnerability Note VU#583184

Original Release Date: 2001-07-17 | Last Revised: 2003-04-17


The Lotus Domino R5 Server Family 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.


The Lotus Domino R5 Server Family (including the Enterprise, Application, and Mail servers) contains multiple vulnerabilities in the code that processes LDAP requests.

In the encoding section of the test suite, this product failed 1 of 77 groups. The failed group tests a server's response to miscellaneous packets with semi-valid BER encodings.

In the application section of the test suite, this product failed 23 of 77 groups. These results suggest that both buffer overflow and format string vulnerabilities are likely to be present in a variety of application components.


One or more of these vulnerabilities allow a remote attacker to execute arbitrary code with the privileges of the Domino server. The server typically runs with system privileges. At least one of these vulnerabilities has been successfully exploited in a laboratory environment.


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)

Vendor Information


Lotus Software Affected

Notified:  April 06, 2001 Updated: March 26, 2003



Vendor Statement

Lotus reproduced the problem as reported by OUSPG and documented it in SPR#DWUU4W6NC8.

Lotus responded quickly to resolve the problem in a maintenance update to Domino. It was addressed in Domino R5.0.7a, which was released on May 18th, 2001. This release can be downloaded from at

The fix is documented in the fix list at

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Researchers at Rapid 7, Inc. have determined that this vulnerability affects several pre-release and beta versions of Lotus Domino R6. For additional information, please see

CVSS Metrics

Group Score Vector



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

CVE IDs: CVE-2001-1311
CERT Advisory: CA-2001-18
Severity Metric: 41.90
Date Public: 2001-07-16
Date First Published: 2001-07-17
Date Last Updated: 2003-04-17 22:51 UTC
Document Revision: 43

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