Re: : [Security] Update bash *NOW*

=E2=80=8EThis is interesting. Only one person maintain bash, really?

=E2=80=8ESimilarly, the responsibility for Bash lies with just one person -=
 Chet Ramey, a developer based at Case Western Reserve University in Ohio.
=C2=A0
http://m.bbc.com/news/technology-29361794

William=C2=A0

=E2=80=8E
Slashdot article http://linux.slashdot.org/story/14/09/24/1638207/remote-ex=
ploit-vulnerability-found-in-bash

Story at http://www.csoonline.com/article/2687265/application-security/remo=
te-exploit-in-bash-cve-2014-6271.html

CVE ID CVE-2014-6271 at http://seclists.org/oss-sec/2014/q3/650

Summary... bash scripts, CGI, perl via "system()", and various other
"commands" invoke a bash shell at times, passing environmental variables
in the process. Problem is that an "environmental variable" ***CAN
CONTAIN A FUNCTION DEFINITION, AND EXECUTE IT WHILST SPAWNING A NEW
SHELL***. E.g. execute the command...

env x=3D'() { :;}; echo vulnerable' bash -c "echo this is a test"

...and you get the following...

vulnerable
this is a test

Replace...

x=3D'() { :;}; echo vulnerable'

...with malicious stuff, and it could get ugly. bash-4.2_p48 seems
to fix this security hole. The same "env" command results in...

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

--=20
Walter Dnes <waltdnes-SLHPyeZ9y/[email protected]>
I don't run "desktop environments"; I run useful applications
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