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2019-10 Security Bulletin: Junos OS: Kernel crash (vmcore) upon receipt of a specific link-local IPv6 packet on devices configured with Multi-Chassis Link Aggregation Group (MC-LAG) (CVE-2019-0067)

  [JSA10966] Show Article Properties


Product Affected:
This issue affects Junos OS 16.1, 16.2, 17.1.
Problem:
Receipt of a specific link-local IPv6 packet destined to the RE may cause the system to crash and restart (vmcore).

By continuously sending a specially crafted IPv6 packet, an attacker can repeatedly crash the system causing a prolonged Denial of Service (DoS).

This issue affects Juniper Networks Junos OS:

16.1 versions prior to 16.1R6-S2, 16.1R7;

16.2 versions prior to 16.2R2-S10;

17.1 versions prior to 17.1R3.

This issue does not affect Juniper Networks Junos OS version 15.1 and prior versions.

This issue affects Junos OS devices with Multi-Chassis Link Aggregation Group (MC-LAG) enabled.

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-2019-0067.

Solution:
The following software releases have been updated to resolve this specific issue: 16.1R6-S2, 16.1R7, 16.2R2-S10, 17.1R3, 17.2R1,  and all subsequent releases.

This issue is being tracked as PR 1261996 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 available workarounds for this issue.
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
2019-10-09: Initial Publication.
Related Links:
CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/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."