2016-01 Security Bulletin: Junos: J-Web denial of service due to vulnerability in Embedthis Appweb Server (CVE-2016-1258)
Product Affected:These issues can affect any product or platform running Junos OS with J-Web enabled.
Problem:A denial of service vulnerability in Embedthis Appweb Server while processing certain malformed HTTP requests may allow a remote unauthenticated user to crash the J-Web service. This issue was found during internal product security testing. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue has been assigned CVE-2016-1258
Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D60, 12.1X46-D45 (pending release), 12.1X47-D30, 12.3R10, 12.3R11, 12.3X48-D20, 13.2X51-D20, 13.3R8, 14.1R6, 14.2R5 and all subsequent releases. This issue is being tracked as PR 925108 and is visible on the Customer Support website.
Workaround:Disable J-Web, or limit access to only trusted hosts.
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: 2016-01-13: Initial publication.
Related Links: CVSS Score:5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Risk Assessment:A network based unauthenticated attacker can cause the J-Web service on a device to become unavailable.