IBM Lotus Domino Server LDAP Request Invalid DN Message Heap Overflow
Vulnerability

iDefense Security Advisory 03.28.07
http://labs.idefense.com/intelligence/vulnerabilities/
Mar 28, 2007

I. BACKGROUND

IBM Lotus Domino Server software provides messaging, calendaring and
scheduling capabilities on a variety of operating systems. More information
about the product is available at the following URL.

http://www-142.ibm.com/software/sw-lotus/domino

II. DESCRIPTION

Remote exploitation of a heap overflow vulnerability in the LDAP
component of
IBM Corp.'s Lotus Domino Server 7.0.1 may allow a remote attacker to cause
denial of service or execute arbitrary code.

When a malformed request is made to the LDAP component of a Lotus Domino
Enterprise Server, a heap overflow can be triggered. The vulnerability
specifically exists in the handling of strings larger than 65535 bytes. When
a string longer than this value is encountered, the service allocates memory
using only the lower 16-bits of the string length. Since the entire
string is
subsequently copied into the newly allocated buffer, a heap-overflow occurs.

III. ANALYSIS

Exploitation of this vulnerability allows attackers to crash the LDAP
service
or potentially execute arbitrary code on the affected host.

In order to attempt exploitation, attackers must be able to connect to the
LDAP service.

Although the service does not run as root, it does run as the same user as
many other components of the Lotus Domino Server. Because of this an
attacker
may gain access to sensitive information or be able to maliciously
subvert the
server in other ways.

IV. DETECTION

This vulnerability has been confirmed to exist within versions 7.0.1 and
7.0.1.1 the Directory Service (LDAP) component of Lotus Domino Server.

V. WORKAROUND

iDefense is currently unaware of any effective workaround for this issue.

VI. VENDOR RESPONSE

IBM Lotus has addressed this vulnerability in the 6.5.6 and 7.0.2 FP1
releases
of Domino. For more information consult IBM Technote swg21257248 via the
following URL.

http://www-1.ibm.com/support/docview.wss?uid=swg21257248

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

10/09/2006  Initial vendor notification
10/10/2006  Initial vendor response
03/28/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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X. LEGAL NOTICES

Copyright © 2007 iDefense, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at
the time of publishing based on currently available information. Use of
the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
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or consequential loss or damage arising from use of, or reliance on, this
information.