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2017-07 Security Bulletin: Junos OS: Insufficient authentication for user login when a specific system configuration error occurs. (CVE-2017-10601)

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Article ID: JSA10802 SECURITY_ADVISORIES Last Updated: 12 Jul 2017Version: 1.0
Product Affected:
This issue affects Junos OS 12.3, 12.3X48, 13.2, 13.3, 14.1, 14.1X53, 14.2, 15.1 on all products and platforms.
Problem:

A specific device configuration can result in a commit failure condition. When this occurs, a user is logged in without being prompted for a password while trying to login through console, ssh, ftp, telnet or su etc.,

This issue relies upon a device configuration precondition to occur. Typically, device configurations are the result of a trusted administrative change to the system’s running configuration. The following error messages may be seen when this failure occurs:

mgd: error: commit failed: (statements constraint check failed)
Warning: Commit failed, activating partial configuration.
Warning: Edit the router configuration to fix these errors.

If the administrative changes are not made that result in such a failure, then this issue is not seen.

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

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-2017-10601.

Solution:

The following software releases have been updated to resolve this specific issue: 12.3R10, 12.3R11, 12.3X48-D20, 13.2R8, 13.3R7, 14.1R4-S12, 14.1R5, 14.1R6, 14.1X53-D30, 14.2R4, 15.1F2, 15.1F3, 15.1R2, 15.1X49-D10, 16.1R1, and all subsequent releases.

This issue is being tracked as PR 1075580 and is visible on the Customer Support website.

Workaround:

Make sure console authentication works as expected after a system configuration change.

Use the SSH certificate based authentication.

Use access lists or firewall filters to limit access to the device only from trusted administrative hosts, networks and users.

Implementation:
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:
  • 2017-07-12: Initial Publication.
CVSS Score:
9.8 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
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."

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