|
Microsoft Exchange SMTP Service Extended Verb Request Buffer Overflow
|
|
Secunia Advisory:
|
SA14920
|
|
|
Release Date:
|
2005-04-12
|
|
Last Update:
|
2005-04-20
|
|
Popularity:
|
12,538 views
|
|
|
Critical:
|
 Highly critical
|
|
Impact:
|
System access
|
|
Where:
|
From remote
|
|
Solution Status:
|
Vendor Patch
|
|
| Software: | Microsoft Exchange Server 2000 Microsoft Exchange Server 2003
|
|
|
Subscribe:
|
Instant alerts on relevant vulnerabilities
|
|
| CVE reference: | CVE-2005-0560
|
|
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
|
|
|
Track this Secunia Advisory
|
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.
Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.
|
|
|
About this Secunia Advisory
|
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
|