GNU Bash incomplete fix Remote Code Execution Vulnerability (CVE-2014-6278)

GNU Bash incomplete fix Remote Code Execution Vulnerability (CVE-2014-6278)

Release date:
Updated on:

Affected Systems:
GNU Bash <= 4.3 bash43-026
Description:
Bugtraq id: 70166
CVE (CAN) ID: CVE-2014-6278

Bash, a Unix shell, was written by Brian fox for the GNU program in 1987.

The GNU Bash 4.3 bash43-026 and earlier versions do not properly parse function definitions in environment variable values, which allows remote attackers to execute arbitrary code or by constructing an environment. This vulnerability stems from incomplete fixes for CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277.

<* Source: Michal zarewski (lcamtuf@echelon.pl)

Link: http://secunia.com/advisories/61549/
*>

Test method:

Alert

The following procedures (methods) may be offensive and are intended only for security research and teaching. Users are at your own risk!
GET/some/script. cgi HTTP/1.0
User-Agent: () {_ ;}& gt; _ [$ ()] {id & gt;/tmp/hi_mom;

Suggestion:
Vendor patch:

GNU
---
The vendor has released a patch to fix this security problem. Please download it from the vendor's homepage:

Http://www.gnu.org/software/bash
Http://lcamtuf.blogspot.com/2014/09/bash-bug-apply-unofficial-patch-now.html
Https://www.suse.com/support/shellshock/
Http://support.novell.com/security/cve/CVE-2014-6277.html
Https://kb.bluecoat.com/index? Page = content & id = SA82

 

GNU Bash:
Http://ftp.gnu.org/gnu/bash/bash-4.3-patches/bash43-027
Http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-050
Http://ftp.gnu.org/gnu/bash/bash-4.1-patches/bash41-014
Http://ftp.gnu.org/gnu/bash/bash-4.0-patches/bash40-041
Http://ftp.gnu.org/gnu/bash/bash-3.2-patches/bash32-054
Http://ftp.gnu.org/gnu/bash/bash-3.1-patches/bash31-020
Http://ftp.gnu.org/gnu/bash/bash-3.0-patches/bash30-019
Http://ftp.gnu.org/gnu/bash/bash-2.05b-patches/bash205b-010

Michal zarewski:
Http://lcamtuf.blogspot.com/2014/09/bash-bug-apply-unofficial-patch-now.html
Http://lcamtuf.blogspot.com/2014/10/bash-bug-how-we-finally-cracked.html

Gitlab-shell is affected by Bash CVE-2014-6271 Vulnerability

Linux security vulnerability exposure Bash is more serious than heartbleed

The solution is to upgrade Bash. Please refer to this article.

Linux Bash Security Vulnerability repair

This article permanently updates the link address: