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AUSCERT External Security Bulletin Redistribution
ESB-2021.0330.2
Sudo vulnerability CVE-2021-3156
9 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Root Compromise -- Existing Account
Resolution: None
CVE Names: CVE-2021-3156
Reference: ASB-2021.0036
ESB-2021.0313
ESB-2021.0307
ESB-2021.0306
ESB-2021.0295
Original Bulletin:
https://support.f5.com/csp/article/K86488846
Revision History: February 9 2021: Vendor updated table of products affected
February 1 2021: Initial Release
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K86488846: Sudo vulnerability CVE-2021-3156
Original Publication Date: 30 Jan, 2021
Latest Publication Date: 09 Feb, 2021
Security Advisory Description
Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege
escalation to root via "sudoedit -s" and a command-line argument that ends with
a single backslash character. (CVE-2021-3156)
Impact
A local attacker can exploit the vulnerability to escalate their privileges on
a vulnerable system giving them access to read or modify sensitive information
or cause a denial-of-service (DoS).
For products with None in the Versions known to be vulnerable column, there is
no impact.
Security Advisory Status
F5 Product Development has assigned SDC-742 (Traffix) 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| | | | |
+------------------+------+----------+----------+-----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM,|14.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|ASM, DDHD, DNS, +------+----------+----------+vulnerable^|None |None |
|FPS, GTM, Link |13.x |None |Not |2 | | |
|Controller, PEM, | | |applicable| | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+-----------+------+----------+
| |7.x |None |Not | | | |
|BIG-IQ Centralized| | |applicable|Not | | |
|Management +------+----------+----------+vulnerable^|None |None |
| |6.x |None |Not |2 | | |
| | | |applicable| | | |
+------------------+------+----------+----------+-----------+------+----------+
| | | |Not |Not | | |
|F5OS |1.x |None |applicable|vulnerable^|None |None |
| | | | |2 | | |
+------------------+------+----------+----------+-----------+------+----------+
|Traffix SDC |5.x |5.1.0 |None |High |7.8 |sudo |
| | | | | | |(bash) |
+------------------+------+----------+----------+-----------+------+----------+
^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.
^2The specified products contain the affected code. However, F5 identifies the
vulnerability status as Not vulnerable because the attacker cannot exploit the
code in default, standard, or recommended configurations.
Security Advisory Recommended Actions
Mitigation
To mitigate this vulnerability, restrict access to the management interface
with appropriate network controls, and restrict login access for affected
systems to only trusted users.
Supplemental Information
o K41942608: Overview of AskF5 security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
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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