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AUSCERT Security Bulletin
ASB-2010.0080.2
Code execution vulnerability identified in the SpamAssassin Milter plugin
29 March 2010
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AusCERT Security Bulletin Summary
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Product: SpamAssassin Milter plugin
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-1132
Member content until: Thursday, April 15 2010
Revision History: March 29 2010: Added CVE Reference
March 16 2010: Initial Release
OVERVIEW
A vulnerability has been identified in the SpamAssassin Milter
Plugin.
IMPACT
The following information was published regarding this
vulnerability:
"A vulnerability was reported in SpamAssassin Milter Plugin. A
remote user can execute arbitrary code on the target system.
When the software is invoked with the expand (-x) flag, the
software makes an unsafe popen() call. A remote user can send a
specially crafted RCPT TO value to execute arbitrary code on the
target system. The code will run with the privileges of the target
service." [1]
MITIGATION
A preliminary patch has been made available on the vendor's website
[1]. Administrators should test the patch before deploying to
production systems. The vulnerability also depends on the plugin
being run with the -x flag, so systems not utilising this
configuration would not be affected. Also for good practise you
should never run plugins as root as this would enable more severe
attacks.
REFERENCES
[1] bug #29136: SpamAssassin Milter Plugin Input Validation Flaw Lets
Remote Users Execute Arbitrary Code
http://savannah.nongnu.org/bugs/index.php?29136
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. 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.
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
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
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.
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