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TITLE:
Microsoft Windows URI Handling Command Execution Vulnerability

SECUNIA ADVISORY ID:
SA26201

VERIFY ADVISORY:
http://secunia.com/advisories/26201/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

OPERATING SYSTEM:
Microsoft Windows XP Professional
http://secunia.com/product/22/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows Server 2003 Datacenter Edition
http://secunia.com/product/1175/
Microsoft Windows Server 2003 Enterprise Edition
http://secunia.com/product/1174/
Microsoft Windows Server 2003 Standard Edition
http://secunia.com/product/1173/
Microsoft Windows Server 2003 Web Edition
http://secunia.com/product/1176/

SOFTWARE:
Microsoft Internet Explorer 7.x
http://secunia.com/product/12366/

DESCRIPTION:
A vulnerability has been discovered in Microsoft Windows, which can
be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to an input validation error within
the handling of system default URIs with registered URI handlers
(e.g. "mailto", "news", "nntp", "snews", "telnet"). This can be
exploited to execute arbitrary commands when a user e.g. using
Firefox visits a malicious website with a specially crafted "mailto"
URI containing a "%" character and ends in a certain extension (e.g.
".bat", ".cmd")

Examples:
mailto:test%../../../../windows/system32/calc.exe".cmd
nntp:../../../../../Windows/system32/telnet.exe" "secunia.com
80%.bat

Successful exploitation requires that Internet Explorer 7 is
installed on the system.

The vulnerability is confirmed on a fully patched Windows XP SP2 and
Windows Server 2003 SP2 system using Firefox version 2.0.0.5 and
Netscape Navigator version 9.0b2. Other versions and browsers may
also be affected.

SOLUTION:
Do not browse untrusted websites or follow untrusted links.

PROVIDED AND/OR DISCOVERED BY:
Vulnerability discovered by:
* Billy (BK) Rios

Firefox not escaping quotes originally discussed by:
* Jesper Johansson

Additional research by Secunia Research.

ORIGINAL ADVISORY:
Billy (BK) Rios:
http://xs-sniper.com/blog/2007/07/24/remote-command-execution-in-firefox-2005/

OTHER REFERENCES:
US-CERT VU#783400:
http://www.kb.cert.org/vuls/id/783400

Jesper Johansson blog:
http://msinfluentials.com/blogs/jesper/archive/2007/07/20/hey-mozilla-quotes-are-not-legal-in-a-url.aspx

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About:
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