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2017-10 Security Bulletin: Junos OS: Denial of service vulnerabilities in telnetd (CVE-2017-10614, CVE-2017-10621)

  [JSA10817] Show Article Properties


Product Affected:
This issue affects Junos OS 12.1X46, 12.3X48, 14.1, 14.1X53, 14.2, 15.1, 15.1X49, 15.1X53, 16.1, 16.2.
Problem:

Two vulnerabilities in telnetd service on Juniper Networks Junos OS may allow a remote unauthenticated attacker to cause a denial of service through memory and/or CPU consumption.

These issues were found during internal product security testing.

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

These issues have been assigned CVE-2017-10614 and CVE-2017-10621.

This issue only affects systems with telnet enabled, which is disabled by default.

Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities.

Solution:

CVE-2017-10614 is resolved in: 12.1X46-D45, 12.3X48-D30, 14.1R4-S9, 14.1R8, 14.2R6, 15.1F5, 15.1R3, 15.1X49-D40, 15.1X53-D232, 15.1X53-D47, 16.1R1, and all subsequent releases.

CVE-2017-10614 is being tracked as PR 1108483 and is visible on the Customer Support website.

CVE-2017-10621 is resolved in: 12.1X46-D71, 12.3X48-D50, 14.1R8-S5, 14.1R9, 14.1X53-D46, 14.1X53-D50, 14.2R7-S9, 14.2R8, 15.1F2-S16, 15.1F5-S7, 15.1F6-S6, 15.1R5-S2, 15.1R6, 15.1X49-D100, 15.1X49-D90, 15.1X53-D47, 16.1R4-S1, 16.1R5, 16.2R1-S3, 16.2R2, 17.1R1, and all subsequent releases.

CVE-2017-10614 is being tracked as PR 1159841 and is visible on the Customer Support website.

Workaround:

Disabling the telnet service will completely mitigate these issues.

It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device via telnet from trusted, administrative networks or hosts.

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:
2017-10-11: 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 Level:
Medium
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."