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2014-04 Security Bulletin: Junos: Persistent Cross Site Scripting vulnerability in J-Web (CVE-2014-2711)

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Article ID: JSA10619 SECURITY_ADVISORIES Last Updated: 09 Apr 2014Version: 1.0
Product Affected:
This issue can affect any product or platform running Junos OS.
Problem:
A persistent cross site scripting vulnerability in J-Web may allow a remote unauthenticated user to inject web script or HTML and steal sensitive data and credentials from a J-Web session and to perform administrative actions on the Junos device.

An attacker can inject web script or HTML even when J-Web is disabled, but the vulnerability can only be exploited when J-Web is used to monitor the system.

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-2014-2711.
Solution:
The following software releases have been updated to resolve this specific issue:
  • All Junos OS software releases built on or after 2014-03-20, or
  • Junos OS 11.4R11, 11.4X27.62 (BBE), 12.1R9, 12.1X44-D35, 12.1X45-D25, 12.1X46-D20, 12.2R7, 12.3R6, 13.1R4, 13.2R3, 13.3R1, and all subsequent releases (i.e. all releases built after 13.3R1).

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 940744 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:
Avoid using J-Web to monitor the system.

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:
9.3 (AV:N/AC:M/Au:N/C:C/I:C/A:C)
Severity Level:
Critical
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."
Acknowledgements:
Juniper SIRT would like to acknowledge and thank Chuck McAuley for responsibly reporting this vulnerability.

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