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AUSCERT External Security Bulletin Redistribution
ESB-2019.0658.2
OpenSSL vulnerability CVE-2018-0732
13 March 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0732
Reference: ASB-2019.0060
ASB-2019.0030
ASB-2019.0025
ASB-2019.0019
ASB-2019.0012
Original Bulletin:
https://support.f5.com/csp/article/K21665601
Revision History: March 13 2019: Updated product table
March 4 2019: Initial Release
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K21665601:OpenSSL vulnerability CVE-2018-0732
Security Advisory
Original Publication Date: 21 Jul, 2018
Latest Publication Date: 13 Mar, 2019
Security Advisory Description
During key agreement in a TLS handshake using a DH(E) based ciphersuite a
malicious server can send a very large prime value to the client. This will
cause the client to spend an unreasonably long period of time generating a key
for this prime resulting in a hang until the client has finished. This could be
exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected
1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o). (
CVE-2018-0732)
Impact
A remote attacker may be able to cause a denial-of-service (DoS) attack.
Security Advisory Status
F5 Product Development has assigned IDs 724680 (BIG-IP), ID 724857 (Enterprise
Manager), ID 724858 (BIG-IQ), and CPF-24923 and CPF-24924 (Traffix SDC) to this
vulnerability. Additionally, BIG-IP iHealth may list Heuristic H21665601 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 |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |14.x |14.0.0 - |14.1.0.2 | | | |
| | |14.1.0 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |13.x |13.0.0 - |13.1.1.2 | | | |
|APM, ASM, DNS, Edge| |13.1.1 | | | | |
|Gateway, FPS, GTM, +------+----------+----------+Medium |4.3 |OpenSSL |
|Link Controller, |12.x |12.1.0 - |12.1.4 | | | |
|PEM, | |12.1.3 | | | | |
|WebAccelerator) +------+----------+----------+ | | |
| |11.x |11.2.1 - |11.6.3.3 | | | |
| | |11.6.3 |11.5.9 | | | |
+-------------------+------+----------+----------+----------+------+----------+
|ARX |6.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None |Medium |4.3 |OpenSSL |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |6.0.0 |None | | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |5.x |5.0.0 - |None |Medium |4.3 |OpenSSL |
|Management | |5.4.0 | | | | |
| +------+----------+----------+ | | |
| |4.x |4.6.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
|BIG-IQ Cloud and |1.x |1.0.0 |None |Medium |4.3 |OpenSSL |
|Orchestration | | | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |2.1.0 - |None |Medium |4.3 |OpenSSL |
| | |2.3.0 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |5.0.0 - |None | | | |
|Traffix SDC | |5.1.0 | |Medium |4.3 |OpenSSL |
| +------+----------+----------+ | | |
| |4.x |4.4.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
^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 limit connections to SSL/TLS servers
only on trusted networks. To protect vulnerable clients, you can configure the
BIG-IP system to proxy outbound SSL connections. For more information about
proxying outbound SSL connections, refer to the following documents:
o The Implementing SSL Forward Proxy on a Single BIG-IP System chapter of the
BIG-IP System: SSL Administration manual
o The BIG-IP Access Policy Manager: Secure Web Gateway manual
Note: For information about how to locate F5 product manuals, refer to
K12453464: Finding product documentation on AskF5.
o K71174564: Overview of F5 SSL Orchestrator
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 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
o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
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