Computer code that could be used to hijack Windows PCs via a yet-to-be-patched Internet Explorer flaw has been posted on the Net, experts have warned.

The code was published on public Web sites, where it is accessible to miscreants who might use it to craft attacks on vulnerable Windows computers. Microsoft is investigating the issue, the company representative said in a statement Thursday.

"Microsoft's initial investigation reveals that this exploit code could allow an attacker to execute memory corruption," the representative said. As a workaround to protect against potential attacks, Microsoft suggests Windows users disable ActiveX and active scripting controls.

The flaw is due to an error in an ActiveX control related to multimedia features and could be exploited by viewing a rigged Web page, Symantec said in an alert sent to users of its DeepSight security intelligence service Thursday. An attacker could commandeer a Windows PC or cause IE to crash, the security company said.

C/Net News