UFS Bug: FreeBSD 6.1/6.2/7.0: MOKB-08-11-2006, CVE-2006-5824, MOKB-03-11-2006, CVE-2006-5679

Tom Samplonius tom at samplonius.org
Thu Nov 23 01:46:05 PST 2006

----- O. Hartmann <ohartman at zedat.fu-berlin.de> wrote:
> Is for these UFS bugs in FreeBSD since 6.1 a fix uderway?
> See:
> http://projects.info-pull.com/mokb/
> MOKB-08-11-2006,CVE-2006-5824, MOKB-03-11-2006,CVE-2006-5679

  Probably not.  In both cases a "crafted filesystem" is mounted to trigger crash.  Garbage in, garbage out.

  It is hardly exploitable, since only root can mount filesystems.  And only root could "craft" a bogus filesystem to crash the kernel.  If you are root, "reboot" is a far faster way to crash the system.

  What the MOKB people seem to leave out, is:  do their "crafted filesystems" pass a "fsck -f"?  If fsck says the filesystem is good, then the kernel should not crash.  But I suspect that "fsck -f" would fix the filesystem.  (BTW, "-f" is mandatory as I suspect that these "crafted filesystems" would have the clean flag set).  If "fsck -f" fixes the filesystem, then both of these bugs are bogus.


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