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AUSCERT External Security Bulletin Redistribution
ESB-2016.0109
Linux kernel vulnerabilities
14 January 2016
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AusCERT Security Bulletin Summary
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Product: F5 BIG-IP
F5 Enterprise Manager
F5 Traffix SDC
Publisher: F5
Operating System: Network Appliance
Virtualisation
Impact/Access: Denial of Service -- Existing Account
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-8104 CVE-2015-7872 CVE-2015-5307
CVE-2015-2925
Reference: ESB-2015.2825
ESB-2015.2806.2
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/k/31/sol31026324.html
https://support.f5.com/kb/en-us/solutions/public/k/94/sol94105604.html
Comment: This bulletin contains two (2) F5 security advisories.
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sol31026324: Linux kernel vulnerabilities CVE-2015-2925, CVE-2015-5307, and
CVE-2015-8104
Security Advisory
Original Publication Date: 01/13/2016
Vulnerability Description
CVE-2015-2925
The prepend_path function in fs/dcache.c in the Linux kernel before 4.2.4 does
not properly handle rename actions inside a bind mount, which allows local
users to bypass an intended container protection mechanism by renaming a
directory, related to a "double-chroot attack."
CVE-2015-5307
The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through
4.6.x, allows guest OS users to cause a denial of service (host OS panic or
hang) by triggering many #AC (aka Alignment Check) exceptions, related to
svm.c and vmx.c.
CVE-2015-8104
The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through
4.6.x, allows guest OS users to cause a denial of service (host OS panic or
hang) by triggering many #DB (aka Debug) exceptions, related to svm.c.
Impact
A local user may be able to bypass a container protection mechanism by
renaming a directory, or cause a denial-of-service (DoS) to the system by
triggering certain exceptions.
Security Issue Status
F5 Product Development has assigned ID 563154 (BIG-IP) 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 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP AAM 12.0.0 11.4.0 - 11.6.0 None High vCMP
BIG-IP AFM 12.0.0 11.3.0 - 11.6.0 None High vCMP
BIG-IP Analytics 12.0.0 11.1.0 - 11.6.0 11.0.0 High vCMP
BIG-IP APM 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP ASM 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP DNS 12.0.0 None High vCMP
BIG-IP Edge Gateway 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP GTM 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP Link Controller 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP PEM 12.0.0 11.3.0 - 11.6.0 None High vCMP
BIG-IP PSM 11.1.0 - 11.4.1 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP WebAccelerator 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High vCMP
BIG-IP WOM 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High vCMP
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise Manager None 3.0.0 - 3.1.1 Not vulnerable None
FirePass None 7.0.0 6.0.0 - 6.1.0 Not vulnerable None
BIG-IQ Cloud None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ Device None 4.2.0 - 4.5.0 Not vulnerable None
BIG-IQ Security None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ ADC None 4.5.0 Not vulnerable None
BIG-IQ Centralized Management None 4.6.0 Not vulnerable None
BIG-IQ Cloud and Orchestration None 1.0.0 Not vulnerable None
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
F5 WebSafe None 1.0.0 Not vulnerable None
Traffix SDC None 4.0.0 - 4.4.0 3.3.2 - 3.5.1 Not vulnerable None
Vulnerability 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.
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.
To mitigate this vulnerability, you can limit access to the Linux shell 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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sol94105604: Linux kernel vulnerability CVE-2015-7872
Security Advisory
Original Publication Date: 01/13/2016
Vulnerability Description
The key_gc_unused_keys function in security/keys/gc.c in the Linux kernel
through 4.2.6 allows local users to cause a denial of service (OOPS) via
crafted keyctl commands. (CVE-2015-7872) Impact
A local user may be able to cause a denial-of-service (DoS) attack on the
system by using specially crafted keyctl commands.
Security Issue Status
F5 Product Development has assigned ID 563154 (BIG-IP), ID 565221 (BIG-IQ), ID
565223 (Enterprise Manager), and INSTALLER-2102 (Traffix SDC) 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 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP AAM 12.0.0 11.4.0 - 11.6.0 None High Linux kernel
BIG-IP AFM 12.0.0 11.3.0 - 11.6.0 None High Linux kernel
BIG-IP Analytics 12.0.0 11.1.0 - 11.6.0 11.0.0 High Linux kernel
BIG-IP APM 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP ASM 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP DNS 12.0.0 None High Linux kernel
BIG-IP Edge Gateway 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP GTM 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP Link Controller 12.0.0 11.1.0 - 11.6.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP PEM 12.0.0 11.3.0 - 11.6.0 None High Linux kernel
BIG-IP PSM 11.1.0 - 11.4.1 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP WebAccelerator 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
BIG-IP WOM 11.1.0 - 11.3.0 11.0.0 10.1.0 - 10.2.4 High Linux kernel
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise Manager 3.0.0 - 3.1.1 None High Linux kernel
FirePass None 7.0.0 6.0.0 - 6.1.0 Not vulnerable None
BIG-IQ Cloud 4.0.0 - 4.5.0 None High Linux kernel
BIG-IQ Device 4.2.0 - 4.5.0 None High Linux kernel
BIG-IQ Security 4.0.0 - 4.5.0 None High Linux kernel
BIG-IQ ADC 4.5.0 None High Linux kernel
BIG-IQ Centralized Management 4.6.0 None High Linux kernel
BIG-IQ Cloud and Orchestration 1.0.0 None High Linux kernel
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 3.3.2 - 3.5.1 None Low Linux kernel
Vulnerability 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.
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.
To mitigate this vulnerability, you can limit access to the Linux shell 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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