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AUSCERT External Security Bulletin Redistribution
ESB-2019.3755
Bash vulnerability CVE-2012-6711
8 October 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2012-6711
Original Bulletin:
https://support.f5.com/csp/article/K05122252
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K05122252:Bash vulnerability CVE-2012-6711
Security Advisory
Original Publication Date: 08 Oct, 2019
Security Advisory Description
A heap-based buffer overflow exists in GNU Bash before 4.3 when wide
characters, not supported by the current locale set in the LC_CTYPE environment
variable, are printed through the echo built-in function. A local attacker, who
can provide data to print through the "echo -e" built-in function, may use this
flaw to crash a script or execute code with the privileges of the bash process.
This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv(). (
CVE-2012-6711)
Impact
A local attacker can perform a buffer-overflow attack, which can lead to data
corruption, allow the malicious code to be run, or cause the program to
terminate.
Security Advisory Status
F5 Product Development has assigned ID 830361 (BIG-IP) to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding Security Advisory versioning.
+-------------------+------+----------+----------+----------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity |score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |None | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.1.0 - |None | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |None |Not |High |7.0 |Bash |
|Link Controller, | | |applicable| | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
To mitigate this vulnerability, you should restrict access to the affected
systems to only trusted users. For more information, refer to K13092: Overview
of securing access to the BIG-IP system.
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 15.x)
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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