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securityvulnsSecurityvulnsSECURITYVULNS:DOC:28442
HistorySep 02, 2012 - 12:00 a.m.

SEC Consult SA-20120829-0 :: Symantec Messaging Gateway - Support Backdoor

2012-09-0200:00:00
vulners.com
8

SEC Consult Vulnerability Lab Security Advisory < 20120829-0 >

          title: Support Backdoor
        product: Symantec Messaging Gateway

vulnerable version: 9.5.x
fixed version: 10.0
CVE number: CVE-2012-3579
impact: Critical
homepage: http://www.symantec.com
found: 2012-06-26
by: S. Viehbock
SEC Consult Vulnerability Lab
https://www.sec-consult.com

Vendor/product description:

"Symantec Messaging Gateway powered by Brightmail, delivers inbound and outbound
messaging security, with effective and accurate real-time antispam and antivirus
protection, advanced content filtering, data loss prevention, and email
encryption. Messaging Gateway is simple to administer and catches more than 99%
of spam with less than one in a million false positives. Defend your email
perimeter, and quickly respond to new messaging threats with this market leading
messaging security solution."

URL: http://www.symantec.com/messaging-gateway

Vulnerability overview/description:

By default the 'support' user is enabled and uses an insecure password. This
user is not visible in the web interface and therefore cannot be disabled.
As the appliance provides a SSH daemon on all interfaces, this account can be
used to gain remote shell access on the device.

Proof of concept:

Connect to the appliance via SSH with the following credentials:
support:removed

Vulnerable / tested versions:

The vulnerability has been verified to exist in the Symantec Mail Gateway version
9.5.4-4, which was the most recent version at the time of discovery.

Vendor contact timeline:

2012-07-11: Contacting vendor through [email protected]
2012-07-11: Vendor response - will forward it to product team for validation
2012-07-25: Update to SMG is being finalized, release date will be coordinated
2012-08-27: Vendor releases advisory and new version.
2012-08-29: SEC Consult releases security advisory

Solution:

Update to the latest release of Symantec Messaging Gateway 10.0.

More information can be found at:
http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&amp;pvid=security_advisory&amp;suid=20120827_00

Workaround:

Restrict SSH access to the Symantec Mail Gateway or change the password of
the 'support' user.

Advisory URL:

https://www.sec-consult.com/en/advisories.html

SEC Consult Unternehmensberatung GmbH

Office Vienna
Mooslackengasse 17
A-1190 Vienna
Austria

Tel.: +43 / 1 / 890 30 43 - 0
Fax.: +43 / 1 / 890 30 43 - 25
Mail: research at sec-consult dot com
www.sec-consult.com


EOF S. Viehbock / @2012
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