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Secunia Research: Symantec Mail Security for SMTP Boundary Errors

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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 email-
borne 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:

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Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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10) 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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