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CVE-2009-1041

Status Candidate

Overview

The ktimer feature (sys/kern/kern_time.c) in FreeBSD 7.0, 7.1, and 7.2 allows local users to overwrite arbitrary kernel memory via an out-of-bounds timer value.

Related Files

FreeBSD Security Advisory - ktimer
Posted Mar 24, 2009
Site security.freebsd.org

FreeBSD Security Advisory - In FreeBSD 7.0, support was introduced for per-process timers as defined in the POSIX realtime extensions. This allows a process to have a limited number of timers running at once, with various actions taken when each timer reaches zero. An integer which specifies which timer a process wishes to operate upon is not properly bounds-checked. An unprivileged process can overwrite an arbitrary location in kernel memory. This could be used to change the user ID of the process (in order to "become root"), to escape from a jail, or to bypass security mechanisms in other ways.

tags | advisory, arbitrary, kernel, root
systems | freebsd, osx
advisories | CVE-2009-1041
SHA-256 | bfe3f8cd4f9f141932f321714dc7fd3f873020d7be4c70aea61d5dfc7f2b2af7
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