Full Disclosure mailing list archives
Re: Critical bash vulnerability CVE-2014-6271
From: Tim <tim-security () sentinelchicken org>
Date: Thu, 25 Sep 2014 13:06:06 -0700
dhcpcd is vulnerable. root@blackarch ~ # dhcpcd -4 eth0 dhcpcd[413]: version 5.6.8 starting dhcpcd[413]: eth0: rebinding lease of 192.168.1.2 dhcpcd[413]: eth0: acknowledged 192.168.1.2 from 192.168.1.1 `() { :;}; echo vulnerable > /TEST' dhcpcd[413]: eth0: checking for 192.168.1.2 ... root@blackarch ~ # cat /TEST vulnerable
If you change the default shell from bash to a more sane one[1], like dash or ash, does this attack disappear? I would assume so, but sometimes foolish packages directly reference /bin/bash in the #! header. (I notice some dhclient shell script hooks don't make an explicit reference at all, while others reference /bin/sh.) tim 1. Under Debian/Ubuntu, 'sudo apt-get install dash' and saying "yes" at the prompt can quickly accomplish this. _______________________________________________ Sent through the Full Disclosure mailing list http://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
Current thread:
- Critical bash vulnerability CVE-2014-6271 Philip Cheong (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Michal Zalewski (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Tony Arcieri (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 (slightly OT logo discussion) Ben Lincoln (F7EFC8C9 - FD) (Sep 26)
- Re: Critical bash vulnerability CVE-2014-6271 Matt Hazinski (Sep 26)
- Re: Critical bash vulnerability CVE-2014-6271 Tony Arcieri (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Michal Zalewski (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Paul Vixie (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Yvan Janssens (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 g () 1337 io (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Evan Teitelman (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Godin, Erik (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Tim (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Paul Vixie (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Seth Arnold (Sep 25)
- Re: Critical bash vulnerability CVE-2014-6271 Paul Vixie (Sep 25)
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- Re: Critical bash vulnerability CVE-2014-6271 Paul Vixie (Sep 25)