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Date: Fri, 26 Sep 2014 02:35:20 -0700
From: Dwayne Litzenberger <dlitz@...tz.net>
To: oss-security@...ts.openwall.com
Cc: chet.ramey@...e.edu
Subject: Re: CVE-2014-6271: remote code execution through bash
For folks like me who are running production systems that don't need
exported functions at all, I've hacked together a little wrapper that
just refuses to run bash if any environment variable's value starts with
a left-paren:
https://github.com/dlitz/bash-shellshock
TL;DR:
$ ls -l /bin/bash*
lrwxrwxrwx 1 root root 20 Sep 26 01:12 /bin/bash -> /bin/bash-shellshock
-rwxr-xr-x 1 root root 1029624 Sep 24 11:51 /bin/bash.real
-rwxr-xr-x 1 root root 10368 Sep 26 00:32 /bin/bash-shellshock
$ XX=1 XXX='(hello' /bin/bash -c env
bash-shellshock: Refusing to start due to possibly unsafe environment variable (see syslog)
It also supports log-only and variable-stripping modes, configurable
system-wide.
I've made binary .deb packages for Debian and Ubuntu, for anyone foolish
enough to trust me. (If you've ever run "sudo pip install pycrypto",
then you're already that foolish. ;)
Tags and SHA256SUMS.asc files are signed using my OpenPGP key.
--
Dwayne C. Litzenberger <dlitz@...tz.net>
OpenPGP: 19E1 1FE8 B3CF F273 ED17 4A24 928C EC13 39C2 5CF7
Content of type "application/pgp-signature" skipped
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