Secunia Research: Symantec Mail Security for SMTP Boundary Errors

From: Secunia Research <remove-vuln(at)secunia.com>
Date: Thu Jun 28 2007 - 09:17:09 EDT

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                     Secunia Research 27/06/2007

          - Symantec Mail Security for SMTP Boundary Errors -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software

• Symantec Mail Security for SMTP 5.0 patch 176.

NOTE: Other versions may also be affected.

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2) Severity

Rating: Less Critical
Impact: Denial of Service
Where: Remote Network

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3) Vendor's Description of Software

"Symantec Mail Security for SMTP defends your business from emailborne  threats that can overload your email infrastructure, reduce employee productivity, and jeopardize confidential information.".

Product Link:
http://www.symantec.com/smb/products/overview.jsp?pcid=mes_sec&pvid=smsmtp50

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4) Description of Vulnerability

Secunia Research has discovered boundary errors in the detection of executable packers in libdayzero.dll as loaded by the Filter Hub (filter-hub.exe) of Symantec Mail Security for SMTP. The errors can be exploited to cause unhandled memory access violations causing the filter hub service to crash.

The crash will cause the Filter Hub service to restart and attempt to reprocess the malicious email causing the mail queue to backup.

The functions that detect the "PE-Shield v0.2" and "ASPack v1.00-1.08.02" both use a value from the executable as an offset into a buffer with insufficient validation.

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5) Solution

Apply fixes.

Symantec Mail Security for SMTP:
Update to version 5.0.1 and apply patch 181.

Symantec Mail Security Appliance:
Update to version 5.0.0-36 or later.

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6) Time Table

23/03/2007 - Vulnerability discovered.
10/04/2007 - Vendor notified.
11/04/2007 - Vendor response.
27/06/2007 - Public disclosure.

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7) Credits

Discovered by Dyon Balding, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2007-1792 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory database as a service to the security community and private individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to do active vulnerability research in order to aid improving the security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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1. Verification

Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2007-48/

Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/

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Received on Thu Jun 28 12:10:36 2007