Bug 36003 – bash: Missing sanitising (3.1)

Bug 36003 - bash: Missing sanitising (3.1)


Summary:	bash: Missing sanitising (3.1)

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Security updates
Version:	UCS 3.1
Hardware:	Other Linux

Importance:	P3 normal (vote)
Target Milestone:	UCS 3.1-1-errata
Assigned To:	Janek Walkenhorst
QA Contact:	Felix Botner

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Blocks:
	Show dependency tree / graph

Reported:	2014-09-26 10:29 CEST by Stefan Gohmann
Modified:	2014-12-11 08:08 CET (History)
CC List:	4 users (show)

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Description Stefan Gohmann

2014-09-26 10:29:54 CEST

Please make a backport for UCS 3.1.

+++ This bug was initially created as a clone of Bug #35992 +++

CVE-2014-6271

Stephane Chazelas discovered a vulnerability in bash, the GNU
Bourne-Again Shell, related to how environment variables are
processed.  In many common configurations, this vulnerability is
exploitable over the network, especially if bash has been configured
as the system shell.

Additional writeup: 
https://securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/

Comment 1 Janek Walkenhorst

2014-09-26 11:58:05 CEST

Additionally there are two out-of-bounds array accesses in the bash parser, which were revealed in Red Hat's internal analysis for these issues and also independently reported by Todd Sabin:

CVE-2014-7186
Parser can allow out-of-bounds memory access while handling redir_stack.

CVE-2014-7187
Off-by-one error in deeply nested flow control constructs.

Comment 2 Janek Walkenhorst

2014-09-26 14:27:28 CEST

squeeze-lts version (4.1-3+deb6u2) built.
Tests (amd64, i386): OK
Advisory: 2014-09-24-bash.yaml

Comment 3 Felix Botner

2014-09-26 14:41:00 CEST

OK - amd64/i386

-> env x='() { :;}; echo vulnerable' bash -c 'echo hello'
hello

OK - reboot/boot still works

OK - YAML

Comment 4 Janek Walkenhorst

2014-09-26 17:56:37 CEST

http://errata.univention.de/ucs/3.1/233.html

Comment 5 Moritz Muehlenhoff

2014-12-11 08:08:11 CET

This update also fixed CVE-2014-6277 and CVE-2014-6278