Product Affected

This issue can affect all SRX Series service gateways with web-authentication policies configured.
Medium
5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N)

Problem


When modifying a web-authentication policy containing a client-match statement, removing the client-match statement causes the web-authentication policy to no longer be enforced. While the control plane configuration will still display as if web-authentication is required (the web-authentication login page still responds and the policies display still reflect the configuration), the actual effective policy that is pushed into the forwarding plane functions like a normal policy without web-authentication. This can cause open access to resources that are assumed to be protected by web-authentication.

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

No other Juniper Networks products or platforms are affected by this issue.

Solution


All Junos OS software releases built on or after 2012-07-12 have fixed this specific issue. Releases containing the fix specifically include: 10.0S27, 10.4S9, 10.4R10, 11.4R1, 12.1R1, and all subsequent releases (i.e. all releases built after 12.1R1).

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 749129 and is visible on the Customer Support website.

KB16765 [juniper.net] - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.


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.

Workaround

Deactivate and re-activate the affected security policy. This will assign a new policy index number and add the correct fw-auth flags in the PFE.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Related Information