Advisory Details

June 10th, 2009

Microsoft Internet Explorer onreadystatechange Memory Corruption Vulnerability

ZDI-09-039
ZDI-CAN-429

CVE ID CVE-2009-1531
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer 7
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists when repeated calls are made to getElementsByTagName() and the reordering of the elements in the document causes an object to be allocated. The use of the event "onreadystatechange" during this operation improperly frees the previously allocated resource. The combination, with repeated page rendering, leads to the exploitable memory corruption.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS09-019.mspx
DISCLOSURE TIMELINE
  • 2009-01-26 - Vulnerability reported to vendor
  • 2009-06-10 - Coordinated public release of advisory
CREDIT ling&wushi of team509
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