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AUSCERT External Security Bulletin Redistribution
ESB-2020.2286.2
glibc vulnerability CVE-2020-1752
17 July 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-1752
Reference: ESB-2020.1109
Original Bulletin:
https://support.f5.com/csp/article/K49921213
Revision History: July 17 2020: Vendor updated product table with vulnerable and fixed version details
July 3 2020: Initial Release
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K49921213:glibc vulnerability CVE-2020-1752
Security Advisory
Original Publication Date: 03 Jul, 2020
Latest Publication Date: 16 Jul, 2020
Security Advisory Description
A use-after-free vulnerability introduced in glibc upstream version 2.14 was
found in the way the tilde expansion was carried out. Directory paths
containing an initial tilde followed by a valid username were affected by this
issue. A local attacker could exploit this flaw by creating a specially crafted
path that, when processed by the glob function, would potentially lead to
arbitrary code execution. This was fixed in version 2.32. (CVE-2020-1752)
Impact
To exploit this issue, a user with the ability to create directories may be
tricked into first creating a very large directory path, then accessing that
path with a glob call. This behavior may lead to arbitrary code execution.
Security Advisory Status
F5 Product Development has assigned ID 921525 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 |16.0.0 |None | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |None | | | |
| | |15.1.0 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.1.0 - |None | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, FPS,+------+----------+----------+Medium |6.3 |glibc |
|GTM, Link |13.x |13.1.0 - |None | | | |
|Controller, PEM) | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|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 BIG-IP system
to only trusted users and do not run untrusted scripts on the system. For more
information, refer to the following articles:
o K13309: Restricting access to the Configuration utility by source IP
address (11.x - 15.x)
o K13092: Overview of securing access to the BIG-IP system
Supplemental Information
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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===========================================================================
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