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AUSCERT External Security Bulletin Redistribution
ESB-2014.1512
Junos: Security issue with Proxy ARP enabled on unnumbered interface
5 September 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: Juniper Junos
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-6014
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10595
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2013-10 Security Bulletin: Junos: Security issue with Proxy ARP enabled on
unnumbered interface (CVE-2013-6014)
PRODUCT AFFECTED:
This issue can affect any product or platform running Junos OS 10.4, 11.4,
11.4X27, 12.1, 12.1X44, 12.1X45, 12.2, 12.3, or 13.1, supporting unnumbered
interfaces.
PROBLEM:
If Proxy ARP is enabled on an unnumbered interface, an attacker directly
connected to the router can poison the ARP cache and create a bogus forwarding
table entry for an IP address, effectively creating a denial of service for
that subscriber or interface. When Proxy ARP is enabled on an unnumbered
interface, the router will answer any ARP message from any IP address which
could lead to exploitable information disclosure.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
No other Juniper Networks products or platforms are affected by this issue.
This issue has been assigned CVE-2013-6014.
SOLUTION:
The following software releases have been updated to resolve this specific
issue:
All Junos OS software releases built on or after 2013-09-18, or
Junos OS 10.4S15, 11.4R9, 11.4X27.44, 12.1R7, 12.1X44-D20, 12.1X45-D15,
12.2R6, 12.3R3, 13.1R3, 13.2R1, and all subsequent releases (i.e. all releases
built after 13.2R1).
Customers can confirm the build date of any Junos OS release by issuing the
command 'show version detail'.
This issue is being tracked as PR 842092 and is visible on the Customer
Support website.
KB16765 - "In which releases are vulnerabilities fixed?" describes which
release vulnerabilities are fixed as per our End of Engineering and End of
Life support policies.
WORKAROUND:
No known workaround exists for this issue.
IMPLEMENTATION:
How to obtain fixed software:
Security vulnerabilities in Junos are fixed in the next available Maintenance
Release of each supported Junos version. In some cases, a Maintenance Release
is not planned to be available in an appropriate time-frame. For these cases,
Service Releases are made available in order to be more timely. Security
Advisory and Security Notices will indicate which Maintenance and Service
Releases contain fixes for the issues described. Upon request to JTAC,
customers will be provided download instructions for a Service Release.
Although Juniper does not provide formal Release Note documentation for a
Service Release, a list of "PRs fixed" can be provided on request.
RELATED LINKS:
KB16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
Report a Vulnerability - How to Contact the Juniper Networks Security Incident
Response Team
CVE-2013-6014: Security issue with Proxy ARP enabled on unnumbered interface
CVSS SCORE:
6.1 (AV:A/AC:L/Au:N/C:N/I:N/A:C)
RISK LEVEL:
Medium
RISK ASSESSMENT:
Information for how Juniper Networks uses CVSS can be found at KB 16446
"Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories."
ACKNOWLEDGEMENTS:
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