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UNIRAS Brief - 87/04 - eEye Security Bulletin - ZoneLabs SMTP Processing Buffer Overflow
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UNIRAS (UK Govt CERT) Briefing Notice - 87/04 dated 26.02.04 Time: 10:25
UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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UNIRAS material is also available from its website at www.uniras.gov.uk and
Information about NISCC is available from www.niscc.gov.uk
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Title
=====
eEye Security Bulletin:
ZoneLabs SMTP Processing Buffer Overflow.
Detail
======
ZoneLabs provides a suite of desktop firewall products. Products in this suite such
as ZoneAlarm analyze incoming and outgoing email messages for malicious or otherwise
abnormal content. When ZoneAlarm examines outgoing email messages a buffer overflow
condition is presented when they retrieve the destination email address from the
message. An attacker can exploit this vulnerability to elevate his privileges to SYSTEM
on any machine protected by a vulnerable ZoneLabs product. This vulnerability can also
be exploited remotely if an attacker can manipulate the protected system into sending
an outgoing email message.
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ZoneLabs SMTP Processing Buffer Overflow
Release Date:
February 18, 2004
Date Reported:
February 13, 2004
Severity:
Medium (Local Privilege Escalation/Remote Code Execution)
Vendor:
ZoneLabs Inc.
Software Affected:
ZoneAlarm 4.0 and above
ZoneAlarm Pro 4.0 and above
ZoneAlarm Plus 4.0 and above
ZoneLabs Integrity client 4.0 and above
Description:
ZoneLabs provides a suite of desktop firewall products. Products in this suite such as ZoneAlarm analyze incoming and outgoing email messages for malicious or otherwise abnormal content. When ZoneAlarm examines outgoing email messages a buffer overflow condition is presented when they retrieve the destination email address from the message. An attacker can exploit this vulnerability to elevate his privileges to SYSTEM on any machine protected by a vulnerable ZoneLabs product. This vulnerability can also be exploited remotely if an attacker can manipulate the protected system into sending an outgoing email message.
Technical Description:
A stack based buffer overflow vulnerability within vsmon.exe can be exploited to execute code with the context of the SYSTEM account. The vulnerability exists within the component responsible for processing the RCPT TO command argument. By specifying a large argument to the RCPT TO command an internal stack based buffer can be overflowed within the TrueVector Internet Monitor (vsmon.exe) process.
Protection:
Retina Network Security Scanner has been updated to identify this vulnerability.
Vendor Status:
ZoneLabs was contacted and within only a few days they produced an update to eliminate this vulnerability within their products. We would like to give special recognition to the responsiveness of ZoneLabs in creating a fix to protect their customers.
http://download.zonelabs.com/bin/free/securityAlert/8.html
Credit:
Discovery: Riley Hassell
Related Links:
Retina Network Security Scanner - Free 15 Day Trial http://www.eeye.com/html/Products/Retina/index.html
Greetings:
All the other firewall vendors on our list.
Copyright (c) 1998-2004 eEye Digital Security Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please e-mail alert@xxxxxxxx for permission.
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Feedback
Please send suggestions, updates, and comments to:
eEye Digital Security
http://www.eEye.com
info@xxxxxxxx
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UNIRAS wishes to acknowledge the contributions of eEye for the information
contained in this Briefing.
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<End of UNIRAS Briefing>
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