Posts tagged: Windows Vulnerability

Jun 20 2012

Hackers Exploit Windows XML Core Services Vulnerability

An unpatched Windows vulnerability considered a critical threat by security experts is being exploited by cybercriminals.

Microsoft disclosed the flaw in XML Core Services (MSXML) 3.0, 4.0 and 6.0 June 12 during its monthly release of patches. The security advisory, which was separate from the patch release, offered a workaround for vulnerability CVE-2012-1889, but no fix.

Vulnerability CVE-2012-1889 is simple to exploit in all known versions of Internet Explorer. An attacker can make a CLSID-identification request by calling MSXML library methods and create an object identifier in order to try to access a non-existent object. Proof of Concept code for causing a crash looks like this:

msxml vulnerability

This code looks simple, but generates memory corruption and crashes Internet Explorer. The exploitation code tries to request a non-initialized object, but reference to memory region already exists. Memory corruption takes place in the helper function _dispatchImpl :: InvokeHelper() in the MSXML library.

Currently, this vulnerability has no patch available but Microsoft has released a Fix it solution. We strongly suggest that you consider this workaround – for now.

Dec 21 2011

Windows-7 Memory Corruption Vulnerability

Windows Memory CorruptionA vulnerability has been discovered in Microsoft Windows, which can be exploited by malicious people to potentially compromise a user’s system.

The vulnerability is caused due to an error in win32k.sys and can be exploited to corrupt memory via e.g. a specially crafted web page containing an IFRAME with an overly large “height” attribute viewed using the Apple Safari browser.

Successful exploitation may allow execution of arbitrary code with kernel-mode privileges.

The vulnerability is confirmed on a fully patched Windows 7 Professional 64-bit.
Other versions may also be affected.

Solution:
No effective solution is currently available.

Discovered By:
webDEViL

Original Advisory:
https://twitter.com/#!/w3bd3vil/status/148454992989261824

<iframe height=’18082563′></iframe> causes a BSoD on win 7 x64 via Safari. Lol!