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2014-07 Security Bulletin: Junos: XSS vulnerability in web authentication (webauth) (CVE-2014-3821)

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Product Affected:
This issue affects SRX Series devices running Junos OS 11.4, 12.1X44, 12.1X45, 12.1X46.
A reflected cross site scripting (XSS) vulnerability in SRX Web Authentication (webauth) may allow the stealing of sensitive information or session credentials from firewall users. This issue affects the device only when Web Authentication is used for firewall user authentication.

SRX Series devices where Web Authentication is used for firewall user authentication will have a configuration similar to:
user@SRX# show
unit 0 {
    family inet {
        address {
            web-authentication http;

Juniper SIRT is not aware of any malicious exploitation of this vulnerability. 

This issue does not affect the WebAuth feature on ScreenOS devices.

This issue has been assigned CVE-2014-3821.
The following Junos OS software releases have been updated to resolve this specific issue: 11.4R11, 12.1X44-D34, 12.1X44-D35, 12.1X45-D25, 12.1X46-D20, 12.1X47-D10, and all subsequent releases (i.e. all releases built after 12.1X47-D10).

This issue is being tracked as PR 907664 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.
This issue can be mitigated through the use of Pass-Through Authentication, rather than Web Authentication, as an alternative form of firewall user authentication.
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:
CVSS Score:
4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Risk Level:
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."