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2016-04 Security Bulletin: Junos: A race condition in the Op script Op URL option allows an authenticated remote attacker to fully compromise the system (CVE-2016-1264)

  [JSA10725] Show Article Properties


Product Affected:
This issue can affect any product or platform running Junos OS.
Problem:

The Op script Op URL option can be used by an authenticated malicious actor performing a series of steps to take advantage of a race condition to ultimately compromise the system by multiple attack vectors.

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-2016-1264.


Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D55, 12.1X46-D40, 12.1X47-D25, 12.3R11, 12.3X48-D20, 12.3X50-D50, 13.2R8, 13.2X51-D39, 13.2X51-D40, 13.2X52-D30, 13.3R7, 14.1R6, 14.1X53-D30, 14.2R4, 15.1F2, 15.1R2, 15.1X49-D10, 15.1X49-D20, 16.1R1 and all subsequent releases.

This issue is being tracked as PR 1088339 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:
Entering the following set will disable the Op URL option:
set system scripts op no-allow-url

Additionally, disabling any existing Junos OS Op scripts using the Op URL option or removing them from the environment may reduce the risk for exploitation of this problem, but which does not resolve the underlying problem.







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.


Modification History:
Modification History:

2016-04-13: Initial publication

Related Links:
CVSS Score:
8.8 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Risk Level:
High
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: