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TITLE:
Microsoft ISA Server Two Vulnerabilities

SECUNIA ADVISORY ID:
SA15693

VERIFY ADVISORY:
http://secunia.com/advisories/15693/

CRITICAL:
Less critical

IMPACT:
Security Bypass, Manipulation of data

WHERE:
>From remote

SOFTWARE:
Microsoft ISA Server 2000
http://secunia.com/product/44/
Microsoft Small Business Server 2000
http://secunia.com/product/43/

DESCRIPTION:
Two vulnerabilities have been reported in Microsoft ISA Server 2000,
which can be exploited by malicious people to manipulate contents in
the web cache or bypass certain security restrictions.

1) An error in the handling of malformed HTTP requests containing
multiple "Content-Length" headers can be exploited to poison the web
cache of the ISA server.

Successful exploitation may allow bypassing of content restrictions
or cause users' requests to be redirected, but requires that the ISA
server has been configured to publish a web server or proxy web
content.

2) An error when validating NetBIOS connections can be exploited by
malicious people to create a NetBIOS connection with the ISA server
via the NetBIOS (all) predefined packet filter.

Successful exploitation requires that the NetBIOS (all) predefined
packet filter has been enabled to allow access to local services
using the NetBIOS protocol.

A security issue has also been reintroduced by a previous patch,
which may result in Basic Credentials being sent over an external
HTTP connection even though SSL is required.

SOLUTION:
Apply patch.

Microsoft ISA Server 2000 (requires SP2):
http://www.microsoft.com/downloads/details.aspx?FamilyId=E579813B-0372-45BE-8070-3F4D7D4CB89C

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Steve Orrin of Watchfire for reporting the first
vulnerability.

The vendor also credits Han Valk for reporting the Basic Credentials
issue.

ORIGINAL ADVISORY:
MS05-034 (KB899753):
http://www.microsoft.com/technet/security/bulletin/ms05-034.mspx

Watchfire:
http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf

OTHER REFERENCES:
Microsoft KB Article 821724:
http://support.microsoft.com/kb/821724

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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