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2017-07 Security Bulletin: MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG (CVE-2017-2346)

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Article ID: JSA10794 SECURITY_ADVISORIES Last Updated: 12 Jul 2017Version: 2.0
Product Affected:
This issue affects Junos OS 14.1X55, 14.2R, 15.1R, and 16.1R running on MX Series.
Problem:

An MS-MPC or MS-MIC Service PIC may crash when large fragmented packets are passed through an Application Layer Gateway (ALG). Repeated crashes of the Service PC can result in an extended denial of service condition.   The issue can be seen only if NAT or stateful-firewall rules are configured with ALGs enabled.

This issue was caused by the code change for PR 1182910 in Junos OS 14.1X55-D30, 14.1X55-D35, 14.2R7, 15.1R5, and 16.1R2. No other versions of Junos OS and no other Juniper Networks products or platforms are affected by this issue.

Affected releases are Juniper Networks Junos OS on MX platforms running:

  • 14.1X55 from 14.1X55-D30 to releases prior to 14.1X55-D35;
  • 14.2R from 14.2R7 to releases prior to 14.2R7-S4, 14.2R8;
  • 15.1R from 15.1R5 to releases prior to 15.1R5-S2, 15.1R6;
  • 16.1R from 16.1R2 to releases prior to 16.1R3-S2, 16.1R4.


Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue has been assigned CVE-2017-2346.
 

Solution:

The following software releases have been updated to resolve this specific issue: 14.1X55-D35, 14.2R7-S4, 14.2R8, 15.1R5-S2, 15.1R6, 16.1R3-S2, 16.1R4, and all subsequent releases.

This issue is being tracked as PR 1214134 and is visible on the Customer Support website.
 

Workaround:
No known workaround exists for this issue.

If NAT and stateful-firewall are not required, disabling them in the [edit applications] stanza will mitigate this issue.
 
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:
5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
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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