Bash – CentOS Updates
Number: AV14-072
Date: 26 September 2014
Purpose
The purpose of this Advisory is to bring attention to recently released security updates for CentOS related to Bash.
Assessment
CentOS has released security updates to address multiple vulnerabilities in Bash. Exploitation of certain services and applications can allow a remote unauthenticated attacker to provide environment variables, override or bypass environment restrictions to execute shell commands and run arbitrary code.
Affected Products :
- CentOS-5
- CentOS-6
- CentOS-7
CVE Reference: CVE-2014-6271, CVE-2014-7169
Suggested Action
CCIRC recommends that owner/operators test and deploy the vendor released updates or workarounds to affected platforms accordingly.
References:
- CentOS:
http://lists.centos.org/pipermail/centos/2014-September/146099.html 723 - Free Software Foundation
https://fsf.org/news/free-software-foundation-statement-on-the-gnu-bash-shellshock-vulnerability - CCIRC Alert AL14-032 Critical vulnerability in Bash
http://www.publicsafety.gc.ca/cnt/rsrcs/cybr-ctr/2014/al14-032-eng.aspx - CCIRC Advisory AV14-069 OpenSSL Critical vulnerability in Bash
http://www.publicsafety.gc.ca/cnt/rsrcs/cybr-ctr/2014/av14-069-eng.aspx - US CERT - Bourne Again Shell (Bash) Remote Code Execution Vulnerability
https://www.us-cert.gov/ncas/current-activity/2014/09/24/Bourne-Again-Shell-Bash-Remote-Code-Execution-Vulnerability - SANS ISC - Update on CVE-2014-6271: Vulnerability in bash (shellshock)
https://isc.sans.edu/forums/diary/Update+on+CVE-2014-6271+Vulnerability+in+bash+shellshock/18707
Note to Readers
In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.
Please note, CCIRC PGP key has recently been updated.
http://www.publicsafety.gc.ca/cnt/ntnl-scrt/cbr-scrt/_fl/CCIRCPublicPGPKey.txt
For general information, please contact Public Safety Canada's Public Affairs division at:
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