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Microsoft Exchange SMTP Service Extended Verb Request Buffer Overflow
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Secunia Advisory:
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SA14920
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Release Date:
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2005-04-12
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Last Update:
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2005-04-20
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Popularity:
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12,538 views
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Critical:
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Highly critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Microsoft Exchange Server 2000
Microsoft Exchange Server 2003
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2005-0560
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Description:
ISS X-Force has reported a vulnerability in Microsoft Exchange Server, which can be exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to a boundary error in the "SvrAppendReceivedChunk()" function in "xlsasink.dll" when processing X-LINK2STATE extended verb requests. This can be exploited to cause a heap-based buffer overflow by connecting to the SMTP service and issuing a specially crafted command.
Successful exploitation allows execution of arbitrary code with the privileges of the SMTP service (by default "Local System").
Exploit code is publicly available.
NOTE: On Exchange Server 2003, unauthorised users are not able to execute the affected command. Instead, this requires permissions usually only granted to other Exchange servers in a domain.
Solution:
Apply patches.
Microsoft Exchange 2000 Server (requires SP3):
http://www.microsoft.com/downloads/de...=2A2AF17E-2E4A-4479-8AC9-B5544EA0BD66
Microsoft Exchange Server 2003:
http://www.microsoft.com/downloads/de...=97F409EB-C8D0-4C94-A67B-5945E26C9267
Microsoft Exchange Server 2003 (requires SP1):
http://www.microsoft.com/downloads/de...=35BCE74A-E84A-4035-BF18-196368F032CC
The following versions are not affected:
* Microsoft Exchange Server 5.5 SP4
* Microsoft Exchange Server 5.0 SP2
Provided and/or discovered by:
Mark Dowd and Ben Layer, ISS X-Force.
Changelog:
2005-04-13: Added link to US-CERT vulnerability note.
2005-04-20: Added additional information from Evgeny Pinchuk.
Original Advisory:
MS05-021 (KB894549):
http://www.microsoft.com/technet/security/Bulletin/MS05-021.mspx
ISS X-Force:
http://xforce.iss.net/xforce/alerts/id/193
Other References:
US-CERT VU#275193:
http://www.kb.cert.org/vuls/id/275193
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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