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Lotus Sametime User Enumeration

Lotus Sametime User Enumeration
Posted Jul 9, 2009
Authored by Karan Khosla | Site senseofsecurity.com.au

Lotus Sametime suffers from a user enumeration vulnerability. This is based on the time it takes to respond when authenticating credentials. IBM Lotus Instant Messaging and Web Conferencing (Sametime) version 6.5.1 is affected.

tags | advisory, web
SHA-256 | cdcae2dc33b38a562b1583b7879b5cbe70a7200ad54c82ce179f4a9c3891f31c

Lotus Sametime User Enumeration

Change Mirror Download
Lotus Sametime User Enumeration Vulnerability - Security Advisory - 
SOS-09-004



Release Date. 9-Jul-2009

Vendor Notification Date. 2-Jun-2009

Product. IBM Lotus Instant Messaging and Web Conferencing (Sametime)

Platform. Windows (verified), possibly others

Affected versions. IBM Lotus Instant Messaging and Web Conferencing
(Sametime) 6.5.1 (verified), possibly others

Severity Rating. Low

Impact. Exposure of sensitive information

Attack Vector. Remote without authentication

Solution Status. Vendor patch not yet available

CVE reference. Not yet allocated



Details.

IBM Lotus Sametime is an enterprise instant messaging and web conferencing
application. During an application penetration test Sense of Security
identified a user enumeration vulnerability when trying to connect to the
Sametime server using the Sametime Connect Client. This occurred as a result
of varying response times depending on whether or not a valid user name is
supplied.

The client takes significantly longer to display the 'Invalid logon' error
message when a valid username (and invalid password) is provided (5-8
seconds). This is a result of additional information exchanges occurring
between the server and client.

When an invalid username (and password) is supplied, the error is displayed
almost instantaneously (1-3 seconds).

This can be used to enumerate valid user names.



Solution.

The vendor has advised that IBM is looking to eliminate this behaviour
completely in a future release.



Discovered by.

Karan Khosla from SOS Labs.



About us.

Sense of Security is a leading provider of IT security and risk management
solutions. Our team has expert skills in assessment and assurance, strategy
and architecture, and deployment through to ongoing management. We are
Australia's premier application security consultancy and trusted IT security
advisor to many of the countries largest organisations.

Sense of Security Pty Ltd

Level 3, 66 King St
Sydney NSW 2000
AUSTRALIA


T: +61 (0)2 9290 4444
F: +61 (0)2 9290 4455
W: http://www.senseofsecurity.com.au
E: info@senseofsecurity.com.au



The latest version of this advisory can be found at:

http://www.senseofsecurity.com.au/advisories/SOS-09-004.pdf



Other Sense of Security advisories can be found at:

http://www.senseofsecurity.com.au/research/it-security-advisories.php

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