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2018-10 Security Bulletin: MX Series: In BBE configurations, receipt of a crafted IPv6 exception packet causes a Denial of Service (CVE-2018-0058)

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Product Affected:
This issue affects Junos OS 15.1, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2. Affected platforms: MX Series.
Problem:

Receipt of a specially crafted IPv6 exception packet may be able to trigger a kernel crash (vmcore), causing the device to reboot.

The issue is specific to the processing of Broadband Edge (BBE) client route processing on MX Series subscriber management platforms, introduced by the Tomcat (Next Generation Subscriber Management) functionality in Junos OS 15.1. This issue affects no other platforms or configurations.

Affected releases are Juniper Networks Junos OS:

  • 15.1 versions prior to 15.1R7-S2, 15.1R8 on MX Series;
  • 16.1 versions prior to 16.1R4-S11, 16.1R7-S2, 16.1R8 on MX Series;
  • 16.2 versions prior to 16.2R3 on MX Series;
  • 17.1 versions prior to 17.1R2-S9, 17.1R3 on MX Series;
  • 17.2 versions prior to 17.2R2-S6, 17.2R3 on MX Series;
  • 17.3 versions prior to 17.3R2-S4, 17.3R3-S2, 17.3R4 on MX Series;
  • 17.4 versions prior to 17.4R2 on MX Series;
  • 18.1 versions prior to 18.1R2-S3, 18.1R3 on MX Series;
  • 18.2 versions prior to 18.2R1-S1, 18.2R2 on MX Series.

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

This issue was seen during production usage.

This issue has been assigned CVE-2018-0058.
 

Solution:

The following software releases have been updated to resolve this specific issue: 15.1R7-S2, 15.1R8, 16.1R4-S11, 16.1R7-S2, 16.1R8, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.3R2-S4, 17.3R3-S2*, 17.3R4, 17.4R2, 18.1R2-S3, 18.1R3, 18.2R1-S1, 18.2R2, 18.3R1, and all subsequent releases.
*Available November 2018

This issue is being tracked as PR 1368599 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
 

Workaround:
There are no viable workarounds for this issue.
 
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
‚Äč2018-10-10: Initial publication

Related Links:
CVSS Score:
5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
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."