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ATI driver flaw exposes Vista kernel to attackers | |
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| Time: 10:04 EST/15:04 GMT | News Source: ZDNet | Posted By: Jonathan Tigner | ||
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An unpatched flaw in an ATI driver was at the center of the mysterious Purple Pill proof-of-concept tool that exposed a way to maliciously tamper with the Windows Vista kernel. Purple Pill, a utility released by Alex Ionescu and yanked an hour later after the kernel developer realized that the ATI driver flaw was not yet patched, provided an easy way to load unsigned drivers onto Vista — effectively defeating the new anti-rootkit/anti-DRM mechanism built into Microsoft’s newest operating system. In an interview, Ionescu confirmed his tool was exploiting a vulnerability in an ATI driver — atidsmxx.sys, version 3.0.502.0 — to patch the kernel to turn off certain checks for signed drivers. This meant that a malicious rootkit author could essentially piggyback on ATI’s legitimately signed driver to tamper with the Vista kernel. | ||
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