Product Affected

This issue can affect all SRX Series services gateways.
Medium
CVSSv2: 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Problem

The SRX Network Security Daemon (nsd) in SRX Series services gateways is susceptible to a denial of service vulnerability. This issue can happen while processing certain DNS response messages for name resolution requests initiated by the SRX device. An attack would require a rogue DNS server.

Repeated crashes of the nsd process would prevent SRX's security subsystem from functioning properly. If this condition occurs, security-related configurations cannot be committed and security-related 'show' commands do not work. For example: 

user@srx> show security zones
error: the network-security subsystem is not running

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-2015-5363 .

Solution

The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D50, 12.1X46-D35, 12.1X47-D25, 12.3X48-D15, and all subsequent releases.

This issue is being tracked as PR 1067941 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

No known workaround exists for this issue.

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."

Modification History

Modification History:

2015-07-08: Initial publication

Related Information

Acknowledgements