August 14, 2007
Microsoft XML Core Services is prone to an integer-overflow vulnerability because the application fails to ensure that integer values are not overrun.
Attackers can exploit this issue by enticing unsuspecting users to view malicious web content. Specially crafted scripts could issue requests to MSXML that trigger memory corruption.
Successfully exploiting this issue allows remote attackers to corrupt heap memory and execute arbitrary code in the context of the affected application. Failed exploit attempts will result in a denial-of-service condition.
Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.
Do not follow links provided by unknown or untrusted sources.
Attackers could exploit this vulnerability by enticing a user to visit a malicious website. Do not follow links provided by sources of questionable integrity.
Set web browser security to disable the execution of script code or active content.
Since a successful exploit of this issue may require malicious script code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.
Do not open email messages from unknown or untrusted individuals.
Attackers could exploit this vulnerability through HTML email messages. Never accept any email from sources of questionable integrity.
Microsoft has released an advisory and fixes to address this issue. Please see the references for more information.
Anonymous researchers working with the VeriSign iDefence VCP, and the Zero Day Initiative reported this issue.
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