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AUSCERT External Security Bulletin Redistribution
ESB-2015.2385
sol17242: Linux kernel SCTP vulnerability CVE-2015-1421
10 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1421
Reference: ESB-2015.1497
ESB-2015.1100
ESB-2015.0799
ESB-2015.0750
ESB-2015.0429
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/17000/200/sol17242.html
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sol17242: Linux kernel SCTP vulnerability CVE-2015-1421
Security Advisory
Original Publication Date: 09/09/2015
Description
Use-after-free vulnerability in the sctp_assoc_update function in
net/sctp/associola.c in the Linux kernel before 3.18.8 allows remote
attackers to cause a denial of service (slab corruption and panic) or
possibly have unspecified other impact by triggering an INIT collision
that leads to improper handling of shared-key data. (CVE-2015-1421)
Impact
Remote attackers may be able to cause a denial-of-service (DoS) attack on
an affected system by triggering an INIT collision in the Stream Control
Transmission Protocol (SCTP). This vulnerability does not affect SCTP
functionality on the data plane, but does affect the SCTP kernel module
on the control plane for BIG-IP, BIG-IQ, and Enterprise Manager systems.
Status
F5 Product Development has assigned ID 520183 (BIG-IP), ID 525368
(BIG-IQ), ID 525369 (Enterprise Manager), and INSTALLER-1420 (Traffix)
to this vulnerability, and has evaluated the currently supported releases
for potential vulnerability.
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:
Product Versions known to be vulnerable Versions known to be not vulnerable Severity Vulnerable component or feature
BIG-IP LTM 11.0.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
10.1.0 - 10.2.4
BIG-IP AAM 11.4.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
BIG-IP AFM 11.3.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
BIG-IP 11.0.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
Analytics
BIG-IP APM 11.0.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
10.1.0 - 10.2.4
BIG-IP ASM 11.0.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
10.1.0 - 10.2.4
BIG-IP DNS None 12.0.0 Not vulnerable None
BIG-IP Edge 11.0.0 - 11.3.0 None Severe* SCTP kernel module
Gateway 10.1.0 - 10.2.4
BIG-IP GTM 11.0.0 - 11.6.0 None Severe* SCTP kernel module
10.1.0 - 10.2.4
BIG-IP Link 11.0.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
Controller 10.1.0 - 10.2.4
BIG-IP PEM 11.3.0 - 11.6.0 12.0.0 Severe* SCTP kernel module
BIG-IP PSM 11.0.0 - 11.4.1 None Severe* SCTP kernel module
10.1.0 - 10.2.4
BIG-IP 11.0.0 - 11.3.0 None Severe* SCTP kernel module
WebAccelerator 10.1.0 - 10.2.4
BIG-IP WOM 11.0.0 - 11.3.0 None Severe* SCTP kernel module
10.1.0 - 10.2.4
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise 3.0.0 - 3.1.1 None Severe* SCTP kernel module
Manager
FirePass None 7.0.0 Not vulnerable None
6.0.0 - 6.1.0
BIG-IQ Cloud 4.0.0 - 4.5.0 None Severe* SCTP kernel module
BIG-IQ Device 4.2.0 - 4.5.0 None Severe* SCTP kernel module
BIG-IQ Security 4.0.0 - 4.5.0 None Severe* SCTP kernel module
BIG-IQ ADC 4.5.0 None Severe* SCTP kernel module
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
F5 WebSafe None 1.0.0 Not vulnerable None
Traffix SDC 4.0.0 - 4.4.0 None High SCTP FEP
3.3.2 - 3.5.1
Note: As of February 17, 2015, AskF5 Security Advisory articles include
the Severity value. Security Advisory articles published before this date
do not list a Severity value.
*The BIG-IP/BIG-IQ/Enterprise Manager software contains vulnerable code
(SCTP kernel module), but the code is not enabled by default. Before a
remote attacker can exploit this vulnerability, a locally authenticated
administrative user must load the vulnerable SCTP kernel module, create
a listener (such as self IP) on the control plane, and allow SCTP traffic
on this listener. Because of the specific conditions required for exploit,
F5 Product Development considers affected BIG-IP/BIG-IQ/Enterprise Manager
systems as not vulnerable in a standard configuration and severely vulnerable
if the described conditions are met.
Recommended Action
If the previous table lists a version in the Versions known to be not
vulnerable column, you can eliminate this vulnerability by upgrading to
the listed version. If the listed version is older than the version you
are currently running, or if the table does not list any version in the
column, then no upgrade candidate currently exists.
F5 responds to vulnerabilities in accordance with the Severity values
published in the previous table. The Severity values and other security
vulnerability parameters are defined in SOL4602: Overview of the F5 security
vulnerability response policy.
BIG-IP/BIG-IQ/Enterprise Manager
If you must load the vulnerable SCTP kernel module for your environment,
F5 recommends that you block upstream traffic to the control plane of the
affected systems. To mitigate this vulnerability for an affected system,
you should permit access to the management interface, and/or the self IP
that exposes SCTP listeners, over a secure network.
Traffix SDC
To mitigate this vulnerability for an affected system, you should use
iptables rules to limit SCTP access to trusted users only.
Supplemental Information
SOL9970: Subscribing to email notifications regarding F5 products
SOL9957: Creating a custom RSS feed to view new and updated documents
SOL4918: Overview of the F5 critical issue hotfix policy
SOL167: Downloading software and firmware from F5
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