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AUSCERT External Security Bulletin Redistribution
ESB-2020.2379.2
Netty vulnerabilities CVE-2019-16869 and CVE-2020-7238
16 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Netty
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7238 CVE-2019-16869
Reference: ESB-2020.0583
Original Bulletin:
https://support.f5.com/csp/article/K75555129
Revision History: July 16 2020: Updated Severity and CVSS for Netty
July 14 2020: Initial Release
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K75555129:Netty vulnerabilities CVE-2019-16869 and CVE-2020-7238
Security Advisory
Original Publication Date: 14 Jul, 2020
Latest Publication Date: 16 Jul, 2020
Security Advisory Description
o CVE-2019-16869
Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP
headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP
request smuggling.
o CVE-2020-7238
Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles
Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked
line) and a later Content-Length header. This issue exists because of an
incomplete fix for CVE-2019-16869.
Impact
These vulnerabilities result in HTTP request smuggling. When malformed or
abnormal HTTP requests are interpreted, the system can interpret them
inconsistently, allowing the attacker to 'smuggle' a request to one device
while the other device is unaware of it.
Security Advisory Status
F5 Product Development has assigned ID 924361 (BIG-IQ) 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 or |
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+----------------+------+----------+----------+----------+------+-------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
|BIG-IP (LTM, | | |applicable| | | |
|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 | | | |
|Controller, PEM,| | |applicable| | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+----------------+------+----------+----------+----------+------+-------------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
|BIG-IQ +------+----------+----------+ | |Netty |
|Centralized |6.x |6.0.0 - |None |Medium |6.0 |(Connectivity|
|Management | |6.1.0 | | | |(SSL, |
| +------+----------+----------+ | |Sockets)) |
| |5.x |5.2.0 - |None | | | |
| | |5.4.0 | | | | |
+----------------+------+----------+----------+----------+------+-------------+
|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
None
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 K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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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