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TITLE:
Microsoft Windows helpctr.exe Invalid URL Processing Vulnerability

SECUNIA ADVISORY ID:
SA40076

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/40076/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=40076

RELEASE DATE:
2010-06-11

DISCUSS ADVISORY:
http://secunia.com/advisories/40076/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/40076/

ONLY AVAILABLE IN CUSTOMER AREA:
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 * Report Reliability
 * Secunia PoC
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https://ca.secunia.com/?page=viewadvisory&vuln_id=40076

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Tavis Ormandy has discovered a vulnerability in Microsoft Windows,
which can be exploited by malicious people to compromise a user's
system.

The vulnerability is caused due to an error in the
"MPC::HTML::UrlUnescapeW()" function in helpctr.exe when escaping
URLs. This can be exploited to bypass restrictions normally imposed
by the "-FromHCP" command-line argument and load arbitrary help
documents.

Successful exploitation allows execution of arbitrary commands
through the use of an additional input sanitation error in the
sysinfomain.htm help document, when opening a specially crafted
"hcp://" URL.

The vulnerability is confirmed on a fully patched Windows XP SP3 with
Windows Media Player 9 and Internet Explorer 8.

SOLUTION:
Do not browse untrusted websites or follow untrusted links. Disable
the "hcp:" URI handler.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy

ORIGINAL ADVISORY:
http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0197.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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

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