Published:
22 February 2004
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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0147 -- eEye Security Bulletin ZoneLabs SMTP Processing Buffer Overflow 23 February 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ZoneAlarm 4.0 and later ZoneAlarm Pro 4.0 and later ZoneAlarm Plus 4.0 and later ZoneLabs Integrity client 4.0 and later Publisher: eEye Digital Security Impact: Denial of Service Administrator Compromise Access Required: Remote Comment: See also the Zone Labs Security Advisory at: http://download.zonelabs.com/bin/free/securityAlert/8.html Zone Labs has stated that "successful exploitation requires one of the following scenarios and applies only to SMTP traffic: o A program listening on port 25/TCP (SMTP) of the target system. This condition is usually only present on SMTP servers. Zone Labs does not recommend using our client security products to protect servers. o A malicious program running on the protected system could trigger the buffer overflow and gain SYSTEM privileges if the user or administrator has given it permission to access the network." - --------------------------BEGIN INCLUDED TEXT-------------------- 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@eEye.com for permission. Disclaimer The information within this paper may change without notice. 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This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQDmKaCh9+71yA2DNAQGY2gP8DKC1EgIMGR3HUv6hBSvQ9Zd9BgNh0Wxr foEXfk9LxGK5zMC4PcNM4Wr77pszlVTvMFRZsp4xRqbnTF0bi7mNq/JW5IBWsoYf Sv5UiKGlHr0/0BCX3mMv1jdlKDwLh4R0h6eLEERvf9oL49lUwZ1r+sFMv5jFvH0a za249GG9prc= =IVqQ -----END PGP SIGNATURE-----