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AUSCERT External Security Bulletin Redistribution
ESB-2016.0086
sol25901386: GRUB2 vulnerability CVE-2015-8370
13 January 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
F5 Enterprise Manager
Publisher: F5
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2015-8370
Reference: ESB-2015.3160
ESB-2015.3141
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/k/25/sol25901386.html
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sol25901386: GRUB2 vulnerability CVE-2015-8370
Security Advisory
Original Publication Date: 01/12/2016
Vulnerability Description
Multiple integer underflows in Grub2 1.98 through 2.02 allow physically
proximate attackers to bypass authentication, obtain sensitive information, or
cause a denial of service (disk corruption) via backspace characters in the
(1) grub_username_get function in grub-core/normal/auth.c or the (2)
grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or
"Out of bounds overwrite" memory error. (CVE-2015-8370)
Impact
This vulnerability can be exploited under certain circumstances, allowing
physically proximate attackers to bypass the system's access authentication.
By default, the GRUB2 configuration used in F5 products does not expose this
issue. The customization of GRUB2 configurations is not supported.
Security Issue Status
F5 Product Development has assigned ID 565911 (BIG-IP), ID 566052 (Enterprise
Manager), and ID 566050 (BIG-IQ) 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 11.3.0 - 11.6.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP AAM 12.0.0 11.4.0 - 11.6.0 None Low GRUB2 *
BIG-IP AFM 12.0.0 11.3.0 - 11.6.0 None Low GRUB2 *
BIG-IP Analytics 12.0.0 11.3.0 - 11.6.0 11.0.0 - 11.2.1 Low GRUB2 *
BIG-IP APM 12.0.0 11.3.0 - 11.6.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP ASM 12.0.0 11.3.0 - 11.6.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP DNS 12.0.0 None Low GRUB2 *
BIG-IP Edge Gateway 11.3.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP GTM 11.3.0 - 11.6.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP Link Controller 12.0.0 11.3.0 - 11.6.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP PEM 12.0.0 11.3.0 - 11.6.0 None Low GRUB2 *
BIG-IP PSM 11.3.0 - 11.4.1 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP WebAccelerator 11.3.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
BIG-IP WOM 11.3.0 11.0.0 - 11.2.1 10.1.0 - 10.2.4 Low GRUB2 *
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise Manager 3.0.0 - 3.1.1 None Low GRUB2 *
FirePass None 7.0.0 6.0.0 - 6.1.0 Not vulnerable None
BIG-IQ Cloud 4.0.0 - 4.5.0 None Low GRUB2 *
BIG-IQ Device 4.2.0 - 4.5.0 None Low GRUB2 *
BIG-IQ Security 4.0.0 - 4.5.0 None Low GRUB2 *
BIG-IQ ADC 4.5.0 None Low GRUB2 *
BIG-IQ Centralized Management 4.6.0 None Low GRUB2 *
BIG-IQ Cloud and Orchestration 1.0.0 None Low GRUB2 *
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
* The system is vulnerable only if a customized GRUB2 configuration is
applied.
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 maintain affected products in a secure
location, which limits physical access to the device.
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
SOL13123: Managing BIG-IP product hotfixes (11.x - 12.x)
SOL9502: BIG-IP hotfix matrix
SOL15106: Managing BIG-IQ product hotfixes
SOL15113: BIG-IQ hotfix matrix
SOL14658: Determining the GRUB bootloader version on the BIG-IP system
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