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oss-security: Re: [oss-security] CVE request: v86d: Failure to v

Re: [oss-security] CVE request: v86d: Failure to validate netlink message sender

From: Josh Bressers <bressers_at_nospam>
Date: Mon Feb 28 2011 - 20:53:44 GMT
To: oss-security@lists.openwall.com

Please use CVE-2011-1070


-- JB ----- Original Message ----- > Versions of the v86d userspace helper for the Linux uvesafb driver > before 0.1.10 did not verify that received netlink messages were sent > by the kernel, allowing unprivileged users to manipulate the video > mode and potentially other consequences. > > v86d executes video BIOS code with access to /dev/mem in response to > netlink messages, using either vm86 mode or an x86 emulator, depending > on configuration. I an unclear on whether it is possible to e.g. crash > the machine or escalate privileges by spoofing requests, or only to > mess with the video card. > > References: > http://repo.or.cz/w/v86d.git/commit/f9abfd412639286c3143e93e8ba2c9598dfba640