Home page logo
/

bugtraq logo Bugtraq mailing list archives

RE: First vulnerabilities in the SP2 - XP ?...
From: "Thor Larholm" <tlarholm () pivx com>
Date: Thu, 19 Aug 2004 10:17:07 -0700

From: Radoslav Dejanović [mailto:radoslav.dejanovic () opsus hr] 
On Monday 16 August 2004 15:58, Jrme ATHIAS wrote:
http://www.heise.de/security/artikel/50051

This might be SP2 bug only if the same bug can't be repeated 
on pre-SP2 machine. Didn't test, but I think this is an old 
trick. Anyone care to test it?

The entire concept of the Zone.Identifier altenate data stream is new to XPSP2. Whenever you download any file from the 
web IE will add an ADS called Zone.Identifier which specifies what IE security zone the file originated from. Later, 
when the user tries to execute this file, Explorer itself will check for this ADS. If it does not exist Explorer will 
simply execute the file as it has always done, but if it does exist and it specifies the Internet zone Explorer will 
then check for a valid digital signature. If such a signature is not found Explorer will prompt the user and ask 
whether to execute this unknown executable from an unknown publisher.

Regardless of whether we think this has a high practical impact the advisory from Jürgen does specify a way to 
circumvent a desired security functionality which has been addded to XPSP2. Circumventing a desired security 
functionality is always interested, especially seeing as this is one of many first steps in a move toward digitally 
signing all executables on the Windows platform.



Regards

Thor Larholm
Senior Security Researcher
PivX Solutions
23 Corporate Plaza #280
Newport Beach, CA 92660
http://www.pivx.com
thor () pivx com
Stock symbol: (PIVX.OB)
Phone: +1 (949) 231-8496
PGP: 0x4207AEE9
B5AB D1A4 D4FD 5731 89D6  20CD 5BDB 3D99 4207 AEE9

PivX defines a new genre in Desktop Security: Proactive Threat Mitigation. 
<http://www.pivx.com/qwikfix>


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault