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AUSCERT External Security Bulletin Redistribution
ESB-2015.1570
SOL16743: MIT Kerberos 5 vulnerability CVE-2014-5355
16 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 ARX
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2014-5355
Reference: ESB-2015.1381
ESB-2015.0924
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/16000/700/sol16743.html
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SOL16743: MIT Kerberos 5 vulnerability CVE-2014-5355
Security AdvisorySecurity Advisory
Original Publication Date: 06/15/2015
Description
MIT Kerberos 5 (aka krb5) through 1.13.1 incorrectly expects that a
krb5_read_message data field is represented as a string ending with a '\0'
character, which allows remote attackers to (1) cause a denial of service
(NULL pointer dereference) via a zero-byte version string or (2) cause a
denial of service (out-of-bounds read) by omitting the '\0' character, related
to appl/user_user/server.c and lib/krb5/krb/recvauth.c. (CVE-2014-5355)
Impact
A remote attacker may be able to cause a denial-of-service (DoS) to
application that uses the Kerberos authentication.
Status
F5 Product Development has assigned ID 476378 (ARX) 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 Versions known to be Severity Vulnerable component or feature
be vulnerable not vulnerable
ARX 6.0.0 - 6.4.0 None Medium ARX GUI and client authentication
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.
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.
ARX
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 table does not list any version in the column, then no
upgrade candidate currently exists.
To mitigate this vulnerability, do not enable Kerberos authentication.
Supplemental Information
SOL9970: Subscribing to email notifications regarding F5 products
SOL9957: Creating a custom RSS feed to view new and updated documents
SOL4602: Overview of the F5 security vulnerability response policy
SOL4918: Overview of the F5 critical issue hotfix policy
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