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posted by n1 on Thursday September 25 2014, @01:59AM   Printer-friendly
from the well,-that's-not-ideal dept.

Ars reports that a new bug has been found in GNU Bash allows remote attackers to execute arbitrary code by setting the process trailing strings after function definitions in the values of environment variables.

This bug is reported to be present in RHEL (ver 4 through 7), Fedora, CentOS (ver 5 through 7), Ubuntu (ver 10.04 LTS, 12.04 LTS, and 14.04 LTS), Debian, and even OS X Mavericks.

This bug is exploitable through Apache servers with mod_cgi and mod_cgid loaded, OpenSSH, malicious DHCP servers in a compromised wireless access point through dhclient, as well as the CUPS printing system.

The Ars also includes a simple single liner that will test your setup for the newly found discovery:

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

A vulnerable system will output the following:

vulnerable
 this is a test

While a patched or unaffected system outputs:

bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test

A patch is already out, so administrators are advised to update Bash.

Editor's Update: Security Engineer Tavis Ormandy has said "The bash patch seems incomplete to me, function parsing is still brittle".

$ env X='() { (a)=>\' sh -c "echo date"; cat echo

 
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  • (Score: 0) by Anonymous Coward on Thursday September 25 2014, @09:03PM

    by Anonymous Coward on Thursday September 25 2014, @09:03PM (#98407)

    You mean the various patches that have been found not to actually fix it?

    This isn't a fucking ego-trip about OS or a circle-jerk about how fucking *wonderful* your facile choice of OS is. This is a bug that affects about twenty accumulative years' worth of Unix OSs (and any Windows that happens to have Bash on it as well). It's to be fixed, not to be used by some smug adolescent prick to fallaciously justify his choice of OS as wank fodder.

    Grow the fucking hell up, for God's sake. Seriously, and without any intent towards flamebait, just fucking Grow. Up. You're pathetic.