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Windows Vulnerability in Animated Cursor Handling

MoreDruid writes "Secunia reports a vulnerability in Windows Animated Cursor Handling. According to the linked article, the rating is "extremely critical". Microsoft has put up their own advisory on the subject, confirming this is a vulnerability that affects Windows 2000, XP, 2003 and Vista. The exploit has already been used in the wild. From the Secunia page: The vulnerability is caused due to an unspecified error in the handling of animated cursors and can e.g. be exploited by tricking a user into visiting a malicious website using Internet Explorer or opening a malicious e-mail message. Successful exploitation allows execution of arbitrary code."

2 of 338 comments (clear)

  1. Caution by Alioth · · Score: 5, Informative

    If you think you're not vulnerable because you won't be downloading an animated cursor, or you're not vulnerable because you have AV software, read this:

    http://www.secureworks.com/research/threats/gozi/ ...which has a similar infection vector (by merely visiting a web page you get infected), and went undetected for 54 days.

    This latest silent exploit, which can be used by merely visiting a web page, will be used for other similar attacks.

  2. IE loads animated cursors via CSS by illegalcortex · · Score: 5, Informative

    For those people saying "turn off animated cursors" and such, I don't think that's a solution. IE allows a webpage (or email if you're using the IE rendering engine in Outlook) to replace your cursor using some IE-specific CSS code. It's as easy as changing the background for a webpage. Examples:

    body {cursor: url('cursor.ani');}
    <BODY style="CURSOR: url('cursor.ani')">
    <BODY style="CURSOR: url('http://www.example.com/cursor.ani')">

    You can do it for the <BODY> element, or for other elements like <A>s. It then loads the specified .ANI file which exploits the hole in IE.

    I am almost positive there is no way to disable this in IE.