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2014-10 Security Bulletin: Junos: RADIUS accounting servers create additional entries in pam_radius.conf (CVE-2014-6379)

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Article ID: JSA10654 SECURITY_ADVISORIES Last Updated: 08 Oct 2014Version: 1.0
Product Affected:
This issue can affect any product or platform running Junos OS configured for RADIUS authentication and accounting.
Problem:
In Junos, when a RADIUS authentication server is configured under [system radius-server], an entry is created in /var/etc/pam_radius.conf. An issue was discovered where RADIUS accounting servers configured under [system accounting destination radius] are also propagated to pam_radius.conf. This can cause authentication requests to be sent to the RADIUS accounting server which may allow for unintended successful authentication. If the same RADIUS server is used for both authentication and accounting — a common configuration — the issue is less severe since RADIUS authentication is sent to the intended server despite the duplicate entries. However, if the RADIUS authentication server is later removed from the configuration, the duplicate entry created by configuration of the RADIUS accounting server will remain in pam_radius.conf, also leading to possible unintended authentication success.

This issue was found during internal product security testing.

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-2014-6379.
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 11.4R12, 12.1R10, 12.1X44-D35, 12.1X45-D25, 12.1X46-D20, 12.1X47-D10, 12.2R8, 12.2X50-D70, 12.3R6, 13.1R4-S3, 13.1X49-D55, 13.1X50-D30, 13.2R4, 13.2X50-D20, 13.2X51-D26, 13.2X51-D30, 13.2X52-D15, 13.3R2, 14.1R1, and all subsequent releases.

This issue is being tracked as PR 947307 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 viable workaround exists for this issue. Manual edits to pam_radius.conf will be overwritten when the configuration is committed. Duplicate entries will, however, be cleaned up after upgrading to a fixed release.
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.
CVSS Score:
5.5 (AV:N/AC:L/Au:S/C:P/I:P/A:N)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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