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AUSCERT External Security Bulletin Redistribution
ESB-2018.0009
K85235351: cURL and libcurl vulnerability CVE-2016-8624
2 January 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-8624
Reference: ASB-2017.0001
ASB-2016.0101
ESB-2016.2642
ESB-2016.2607
Original Bulletin:
https://support.f5.com/csp/article/K85235351
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K85235351: cURL and libcurl vulnerability CVE-2016-8624
Security Advisory
Original Publication Date: Apr 15, 2017
Updated Date: Dec 22, 2017
Security Advisory Description
** RESERVED ** This candidate has been reserved by an organization or
individual that will use it when announcing a new security problem. When the
candidate has been publicized, the details for this candidate will be provided.
(CVE-2016-8624)
Impact
When a domain name ends with a number sign (#), cURL does not parse the
authority component of the URL correctly and can be tricked into connecting to
a different host. For example:
http://f5.com#@example.com/x.txt
To exploit this vulnerability, cURL must parse a malformed URL. The BIG-IP
system uses cURL/libcurl for IMAP, FTP, POP3, SMTP, Windows WMI, RealServer,
and custom external monitors that incorporate cURL. On the BIG-IP system,
access to the cURL utility is restricted to locally authenticated users.
Security Advisory Status
F5 Product Development has assigned ID 655421 (BIG-IP), ID 655675 (BIG-IQ), ID
655804 (F5 iWorkflow), ID 655673 (Enterprise Manager), ID 476510 (ARX), and
CPF-23662, CPF-23663, and CPF-23664 (Traffix SDC) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H85235351 on the Diagnostics >
Identified > Low screen.
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:
+--------------+-------------+--------------+-----------+---------------------+
| |Versions |Versions known| |Vulnerable component |
|Product |known to be |to be not |Severity |or feature |
| |vulnerable |vulnerable | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP LTM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP AAM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP AFM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP |12.1.2 |13.1.0 |Low |cURL and libcurl |
|Analytics |11.4.0 - | | | |
| |11.6.1 | | | |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP APM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP ASM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
|BIG-IP DNS |12.0.0 - |13.1.0 |Low |cURL and libcurl |
| |12.1.2 | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IP Edge |11.2.1 |None |Low |cURL and libcurl |
|Gateway | | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |11.4.0 - | | | |
|BIG-IP GTM |11.6.1 |None |Low |cURL and libcurl |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP Link |12.1.2 |13.1.0 |Low |cURL and libcurl |
|Controller |11.4.0 - | | | |
| |11.6.1 | | | |
| |11.2.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP PEM |12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.4.0 - | | | |
| |11.6.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IP PSM |11.4.0 - |None |Low |cURL and libcurl |
| |11.4.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IP |11.2.1 |None |Low |cURL and libcurl |
|WebAccelerator| | | | |
+--------------+-------------+--------------+-----------+---------------------+
| |13.0.0 | | | |
| |12.0.0 - | | | |
|BIG-IP WebSafe|12.1.2 |13.1.0 |Low |cURL and libcurl |
| |11.6.0 - | | | |
| |11.6.1 | | | |
+--------------+-------------+--------------+-----------+---------------------+
| | | | |libcurl via the |
|ARX |6.2.0 - 6.4.0|None |Low |Management API |
| | | | |(disabled by default)|
+--------------+-------------+--------------+-----------+---------------------+
|Enterprise |3.1.1 |None |Low |cURL and libcurl |
|Manager | | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ Cloud |4.0.0 - 4.5.0|None |Low |cURL and libcurl |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ Device |4.2.0 - 4.5.0|None |Low |cURL and libcurl |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ |4.0.0 - 4.5.0|None |Low |cURL and libcurl |
|Security | | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ ADC |4.5.0 |None |Low |cURL and libcurl |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ |5.0.0 - 5.1.0| | | |
|Centralized |4.6.0 |None |Low |cURL and libcurl |
|Management | | | | |
+--------------+-------------+--------------+-----------+---------------------+
|BIG-IQ Cloud | | | | |
|and |1.0.0 |None |Low |cURL and libcurl |
|Orchestration | | | | |
+--------------+-------------+--------------+-----------+---------------------+
|F5 iWorkflow |2.0.0 - 2.1.0|None |Low |cURL and libcurl |
+--------------+-------------+--------------+-----------+---------------------+
| | | |Not | |
|LineRate |None |2.5.0 - 2.6.2 |vulnerable^|None |
| | | |1 | |
+--------------+-------------+--------------+-----------+---------------------+
|Traffix SDC |5.0.0 - 5.1.0|None |Medium |cURL and libcurl |
| |4.0.0 - 4.4.0| | | |
+--------------+-------------+--------------+-----------+---------------------+
^1 The specified product contains 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
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 Versions known to be not vulnerable 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.
To determine the necessary upgrade path for your BIG-IQ system, you should
understand the BIG-IQ product offering name changes. For more information,
refer to K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
.
Mitigation
BIG-IP, BIG-IQ, Enterprise Manager, and iWorkflow
To mitigate this vulnerability, if feasible, you should avoid using the local
cURL utility in scripts and the BIG-IP system's Extended Application
Verification (EAV) monitors on the vulnerable system. Additionally, you should
only permit access to the system over a secure network and limit login access
to trusted users. For more information about securing access to the BIG-IP or
Enterprise Manager system, refer to K13092: Overview of securing access to the
BIG-IP system.
ARX
To mitigate this vulnerability, avoid enabling the API functionality.
Supplemental Information
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
o K4602: Overview of the F5 security vulnerability response policy
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