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authorCarlos O'Donell <carlos@redhat.com>2013-07-19 02:42:03 -0400
committerCarlos O'Donell <carlos@redhat.com>2013-07-21 15:39:55 -0400
commite4608715e6e1dd2adc91982fd151d5ba4f761d69 (patch)
tree04bc13d3736e14045f0f9fc37e0303a067f943cf /io
parentda2d62df77de66e5de5755228759f8bc18481871 (diff)
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CVE-2013-2207, BZ #15755: Disable pt_chown.
The helper binary pt_chown tricked into granting access to another
user's pseudo-terminal.

Pre-conditions for the attack:

 * Attacker with local user account
 * Kernel with FUSE support
 * "user_allow_other" in /etc/fuse.conf
 * Victim with allocated slave in /dev/pts

Using the setuid installed pt_chown and a weak check on whether a file
descriptor is a tty, an attacker could fake a pty check using FUSE and
trick pt_chown to grant ownership of a pty descriptor that the current
user does not own.  It cannot access /dev/pts/ptmx however.

In most modern distributions pt_chown is not needed because devpts
is enabled by default. The fix for this CVE is to disable building
and using pt_chown by default. We still provide a configure option
to enable hte use of pt_chown but distributions do so at their own
risk.
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