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2017-10 Security Bulletin: Junos: EX Series PFE and MX MPC7E/8E/9E PFE crash when fetching interface stats with 'extended-statistics' enabled (CVE-2017-10611)

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Article ID: JSA10814 SECURITY_ADVISORIES Last Updated: 11 Oct 2017Version: 1.0
Product Affected:
This issue affects Junos OS on MX Series, EX2200, EX3300, XRE200.
Problem:

If extended statistics are enabled via 'set chassis extended-statistics', when executing any operation that fetches interface statistics, including but not limited to SNMP GET requests, the pfem process or the FPC may crash and restart. Repeated crashes of PFE processing can result in an extended denial of service condition.

This issue only affects the following platforms:

  • EX2200, EX3300, XRE200
  • MX Series routers with MPC7E/8E/9E PFEs installed.

and only if 'extended-statistics' are enabled under the [edit chassis] configuration.

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

Juniper SIRT is not aware of any malicious exploitation of this vulnerability, however, the issue has been seen in a production network.

This issue has been assigned CVE-2017-10611.
 

Solution:

The following software releases have been updated to resolve this specific issue: 14.1R8-S5, 14.1R9, 14.1X53-D46, 14.1X53-D50, 14.2R7-S9, 14.2R8, 15.1F5-S8, 15.1F6-S8, 15.1R5-S3, 15.1R6, 16.1R4-S5, 16.1R5, 16.1X65-D45, 16.2R2-S1, 16.2R3, 17.1R2-S2, 17.1R3, 17.2R1-S3, 17.2R2, 17.2X75-D50, 17.3R1-S1, 17.3R2, 17.4R1, and all subsequent releases.

This issue is being tracked as PR 1247026 and is visible on the Customer Support website.
 

Workaround:

Disable chassis extended-statistics.

Use access lists or firewall filters to limit access to the router via SNMP or CLI only from trusted hosts and administrators.
 

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.

CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
High
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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