Dear Adam,

> It would be more helpful if you checked, before filing grave bugs on
> packages.

I apologize for my laziness. I do not normally use fuse. Maybe I could
set up a test machine, but (unless succeeded in the exploit) would not
properly know whether Debian was safe. I thought it was better to warn
now, than leave blissfully vulnerable.

> This sounds very much like CVE-2009-3297, which has been fixed in
> unstable, testing and stable since February (see DSA-1989-1).

The page  http://www.debian.org/security/2010/dsa-1989  refers to
http://bugs.debian.org/567633  which says:
  a race condition if two fusermount -u instances are run in paralell
so that does not seem to be the same issue.

The page  http://security-tracker.debian.org/tracker/DSA-1989-1  points
to  http://security-tracker.debian.org/tracker/CVE-2010-0789  which
mentions "a symlink attack", which may be closer to this issue.

I would expect DSA-1989 to have been adopted and fixed by Ubuntu,
where the original poster says he found the issue.

Cheers, Paul

Paul Szabo   p...@maths.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia



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