Microsoft has had to reissue a patch following the introduction in its 9 August monthly update of a bug that caused Internet Explorer to crash.
The company was expected to release a new version of security update 918899 (MS06-042) on 22 August to address the problem, which affects users of Internet Explorer 6 Service Pack 1 when they access certain websites. But it delayed releasing the update until 24 August.
In a statement on the Microsoft security site, the company said it had discovered an issue during final testing.
Prior to the release of the update, Microsoft issued users with a workaround that prevents access to sites running the HTTP 1.0 protocol.
The patch fixes a problem that could enable a hacker to take control of a PC, install programs, view and change data and create log-in accounts.
David Lacey of IT security group Jericho Forum said Microsoft's problems highlighted how important it was for IT departments to test patches thoroughly. He urged IT directors to make sure the business was aware of the need to schedule in the testing of patches.
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