Secunia

Multiple vulnerabilities have been reported in Internet Explorer, where the most critical can be exploited by malicious people to compromise a user's system.

1) A boundary error within the processing of CSS (Cascading Style Sheets) can be exploited to cause a buffer overflow via a malicious web page or HTML e-mail message.

Successful exploitation allows execution of arbitrary code.

2) An error in the cross-domain security model within the handling of navigation methods by functions with similar names can be exploited to execute arbitrary script code in the "Local Machine" security zone or access information in a different domain.

For more information:
SA12048

3) An integer overflow in the Install Engine Control module (inseng.dll) can be exploited to cause a heap-based buffer overflow via a malicious web page or HTML email.

Successful exploitation allows execution of arbitrary code.

4) Insufficient validation of drag and drop events issued from the "Internet" zone to local resources can be exploited by malicious people to plant arbitrary executable files on a user's system.

For more information:
SA12321

5) A canonicalization error within the processing of URLs on DBCS (Double Byte Character Set) systems can be exploited to spoof information displayed in the address bar.

6) An error within the processing of plug-in navigations can be exploited to spoof information displayed in the address bar.

7) An error within the way scripts are processed in image tags can be exploited to save files on a user's system by tricking the user into visiting a malicious web site or view a malicious e-mail message.

For more information:
SA12048

8) An error within the handled of cached SSL content can be exploited to access sensitive information or spoof content on SSL-protected web sites.

9) A boundary error in the Heartbeat ActiveX component (Heartbeat.ocx) used on some MSN gaming sites can be exploited to cause a heap-based buffer overflow by passing an overly long string for the SetupData parameter.

Successful exploitation allows execution of arbitrary code on a user's system when e.g. a malicious web site is visited.

Solution
Apply patches.
Further details available in Customer Area

Provided and/or discovered by
3) Greg Jones of KPMG UK and Peter Winter-Smith of Next Generation Security Software.
8) Mitja Kolsek, ACROS Security.
9) John Heasman, Next Generation Security Software.

Changelog
Further details available in Customer Area

Original Advisory
MS04-038 (KB834707):
http://www.microsoft.com/technet/security/bulletin/ms04-038.mspx

ACROS Security:
http://www.acrossecurity.com/aspr/ASPR-2004-10-13-1-PUB.txt

NGSSoftware:
http://www.ngssoftware.com/advisories/heartbeatfull.txt
http://www.ngssoftware.com/advisories/msinsengfull.txt

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area