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AUSCERT External Security Bulletin Redistribution
ESB-2018.3251
K27228191: Node.js vulnerability CVE-2018-7159
24 October 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: None
CVE Names: CVE-2018-7159
Reference: ESB-2018.1980
ESB-2018.1038
Original Bulletin:
https://support.f5.com/csp/article/K27228191
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K27228191: Node.js vulnerability CVE-2018-7159
Security Advisory
Original Publication Date: Oct 20, 2018
Updated Date: Oct 23, 2018
Security Advisory Description
The HTTP parser in all current versions of Node.js ignores spaces in the
`Content-Length` header, allowing input such as `Content-Length: 1 2` to be
interpreted as having a value of `12`. The HTTP specification does not allow
for spaces in the `Content-Length` value and the Node.js HTTP parser has been
brought into line on this particular difference. The security risk of this flaw
to Node.js users is considered to be VERY LOW as it is difficult, and may be
impossible, to craft an attack that makes use of this flaw in a way that could
not already be achieved by supplying an incorrect value for `Content-Length`.
Vulnerabilities may exist in user-code that make incorrect assumptions about
the potential accuracy of this value compared to the actual length of the data
supplied. Node.js users crafting lower-level HTTP utilities are advised to
re-check the length of any input supplied after parsing is complete. (
CVE-2018-7159)
Impact
BIG-IP
According to CVE-2018-7159, it may be impossible to craft an attack that uses
this flaw in a way that could not already be achieved by supplying an incorrect
'Content-Length' value. However, when the flaw is exploited, it may cause the
affected Node.js component to behave unexpectedly.
BIG-IQ, F5 iWorkflow, Enterprise Manager, and Traffix SDC
There is no impact; these F5 products are not affected by this vulnerability.
Security Advisory Status
F5 Product Development has assigned IDs 744340 and 745103 (BIG-IP) to this
vulnerability. Additionally, BIG-IP iHealth may list Heuristic H27228191 on the
Diagnostics > Identified > Medium page.
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 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 or |
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+----------------+------+----------+----------+----------+------+-------------+
| |14.x |14.0.0 |None | | | |
|BIG-IP (LTM, +------+----------+----------+ | | |
|AAM, AFM, |13.x |13.0.0 - |None | | | |
|Analytics, APM, | |13.1.1 | | | | |
|ASM, DNS, Edge +------+----------+----------+Medium |5.3 |Node.js, |
|Gateway, FPS, |12.x |12.1.0 - |None | | |f5-rest-node |
|GTM, Link | |12.1.3 | | | | |
|Controller, PEM,+------+----------+----------+ | | |
|WebAccelerator) |11.x |11.2.1 - |None | | | |
| | |11.6.3 | | | | |
+----------------+------+----------+----------+----------+------+-------------+
|Enterprise |3.x |None |Not |Not |None |None |
|Manager | | |applicable|vulnerable| | |
+----------------+------+----------+----------+----------+------+-------------+
| |6.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+----------+----------+ | | |
|Centralized |5.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+----------------+------+----------+----------+----------+------+-------------+
|BIG-IQ Cloud and|1.x |None |Not |Not |None |None |
|Orchestration | | |applicable|vulnerable| | |
+----------------+------+----------+----------+----------+------+-------------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+----------------+------+----------+----------+----------+------+-------------+
| |5.x |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+----------------+------+----------+----------+----------+------+-------------+
^1 The 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
None
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 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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