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June 24, 2015 12:00 am

HP Researchers Disclose Details of Internet Explorer Zero Day

Trailrunner7 writes: Researchers at HP's Zero Day Initiative have disclosed full details and proof-of-concept exploit code for a series of bugs they discovered that allow attackers to bypass a key exploit mitigation in Internet Explorer. The disclosure is a rarity for ZDI. The company typically does not publish complete details and exploit code for the bugs it reports to vendors until after the vulnerabilities are fixed. But in this case, Microsoft has told the researchers that the company doesn't plan to fix the vulnerabilities, even though the bugs were serous enough to win ZDI's team a $125,000 Blue Hat Bonus from Microsoft. The reason: Microsoft doesn't think the vulnerabilities affect enough users. The vulnerabilities that the ZDI researchers submitted to Microsoft enable an attacker to fully bypass ASLR (address space layout randomization), one of the many mitigations in IE that help prevent successful exploitation of certain classes of bugs. ZDI reported the bugs to Microsoft last year and disclosed some limited details of them in February. The researchers waited to release the full details until Microsoft fixed all of the flaws, but Microsoft later informed them that they didn't plan to patch the remaining bugs because they didn't affect 64-bit systems.

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