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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 /ChangeLog | |
| parent | da2d62df77de66e5de5755228759f8bc18481871 (diff) | |
| download | glibc-e4608715e6e1dd2adc91982fd151d5ba4f761d69.zip glibc-e4608715e6e1dd2adc91982fd151d5ba4f761d69.tar.gz glibc-e4608715e6e1dd2adc91982fd151d5ba4f761d69.tar.bz2 | |
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 'ChangeLog')
| -rw-r--r-- | ChangeLog | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -1,3 +1,24 @@ +2013-07-21 Siddhesh Poyarekar <siddhesh@redhat.com> + Andreas Schwab <schwab@suse.de> + Roland McGrath <roland@hack.frob.com> + Joseph Myers <joseph@codesourcery.com> + Carlos O'Donell <carlos@redhat.com> + + [BZ #15755] + * config.h.in: Define HAVE_PT_CHOWN. + * config.make.in (build-pt-chown): New variable. + * configure.in (--enable-pt_chown): New configure option. + * configure: Regenerate. + * login/Makefile: Include Makeconfig. Build pt_chown only if + build-pt-chown is enabled. + * sysdeps/unix/grantpt.c (grantpt) [HAVE_PT_CHOWN]: Spawn + pt_chown to fix pty ownership. + * sysdeps/unix/sysv/linux/grantpt.c [HAVE_PT_CHOWN]: Define + CLOSE_ALL_FDS. + * manual/install.texi (Configuring and compiling): Mention + --enable-pt_chown. Add @findex for grantpt. + * INSTALL: Regenerate. + 2013-07-20 David S. Miller <davem@davemloft.net> * sysdeps/sparc/fpu/libm-test-ulps: Update ULPs to handle minor |