Internet Explorer Patch Buffer Overflow Vulnerability



Date Discovered

December 19, 2003


It has been reported that the Internet Explorer patch supplied by for the Multiple Browser URI Display Obfuscation Weakness (BID 9182) may be prone to a buffer overflow condition that may allow an attacker to execute arbitrary code on a vulnerable system in order to gain unauthorized access. The condition is present due to insufficient boundary checking. The problem is reported to exist in the BeforeNavigateEvent() function of IETray.cpp module. This may also cause a denial of service condition in Internet Explorer.

Technologies Affected

  • IEpatch


Run all software as a nonprivileged user with minimal access rights.
Execute all client software with minimal privileges. This may limit consequences of a successful attack.

Implement multiple redundant layers of security.
Memory protection schemes and randomly mapped memory pages may protect against attacks.

Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: <>.



The disclosure of this issue has been credited to Heise Security.

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