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| author | Carlos O'Donell <carlos@redhat.com> | 2013-07-19 02:42:03 -0400 |
|---|---|---|
| committer | Carlos O'Donell <carlos@redhat.com> | 2013-07-21 15:39:55 -0400 |
| commit | e4608715e6e1dd2adc91982fd151d5ba4f761d69 (patch) | |
| tree | 04bc13d3736e14045f0f9fc37e0303a067f943cf /config.make.in | |
| parent | da2d62df77de66e5de5755228759f8bc18481871 (diff) | |
| download | glibc-e4608715e6e1dd2adc91982fd151d5ba4f761d69.tar.gz | |
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.
Diffstat (limited to 'config.make.in')
| -rw-r--r-- | config.make.in | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/config.make.in b/config.make.in index b01b70be2b..7b04568a22 100644 --- a/config.make.in +++ b/config.make.in @@ -95,6 +95,7 @@ link-obsolete-rpc = @link_obsolete_rpc@ build-nscd = @build_nscd@ use-nscd = @use_nscd@ build-hardcoded-path-in-tests= @hardcoded_path_in_tests@ +build-pt-chown = @build_pt_chown@ # Build tools. CC = @CC@ |