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2019-10 Security Bulletin: Junos OS: MX Series: An MPC10 Denial of Service (DoS) due to OSPF states transitioning to Down, causes traffic to stop forwarding through the device. (CVE-2019-0056)

  [JSA10954] Show Article Properties


Product Affected:
This issue affects Junos OS 18.1, 18.1X75, 18.2, 18.2X75, 18.3, 18.4. Affected platforms: MX2008, MX2010, MX2020, MX480, MX960.
Problem:
This issue only affects devices with three (3) or more MPC10's installed in a single chassis with OSPF enabled and configured on the device.

An Insufficient Resource Pool weakness allows an attacker to cause the device's Open Shortest Path First (OSPF) states to transition to Down, resulting in a Denial of Service (DoS) attack. This attack requires a relatively large number of specific Internet Mixed (IMIXed) types of genuine and valid IPv6 packets to be transferred by the attacker in a relatively short period of time, across three or more PFE's on the device at the same time. Continued receipt of the traffic sent by the attacker will continue to cause OSPF to remain in the Down starting state, or flap between other states and then again to Down, causing a persistent Denial of Service. This attack will affect all IPv4, and IPv6 traffic served by the OSPF routes once the OSPF states transition to Down.

This issue affects:

Juniper Networks Junos OS on MX480, MX960, MX2008, MX2010, MX2020:

18.1 versions prior to 18.1R2-S4, 18.1R3-S5;

18.1X75 version 18.1X75-D10 and later versions;

18.2 versions prior to 18.2R1-S5, 18.2R2-S3, 18.2R3;

18.2X75 versions prior to 18.2X75-D50;

18.3 versions prior to 18.3R1-S4, 18.3R2, 18.3R3;

18.4 versions prior to 18.4R1-S2, 18.4R2.

OSPF configuration examples can be found at https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-configuring-interfaces.html#jd0e229

You can issue show chassis at the device to determine if there are multiple MCP10's in your system. For example:

root@device> show chassis fpc pic-status
Slot 1 Online MPC10E 3D MRATE-15xQSFPP
PIC 0 Online MRATE-5xQSFPP
PIC 1 Online MRATE-5xQSFPP
PIC 2 Online MRATE-5xQSFPP
Slot 2 Online MPC10E 3D MRATE-15xQSFPP
PIC 0 Online MRATE-5xQSFPP
PIC 1 Online MRATE-5xQSFPP
PIC 2 Online MRATE-5xQSFPP
Slot 3 Online MPC10E 3D MRATE-15xQSFPP
PIC 0 Online MRATE-5xQSFPP
PIC 1 Online MRATE-5xQSFPP
PIC 2 Online MRATE-5xQSFPP

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2019-0056.

Solution:
The following software releases have been updated to resolve this specific issue: 18.1R2-S4, 18.1R3-S5, 18.2R1-S5, 18.2R2-S3, 18.2R3, 18.2X75-D50, 18.3R1-S4, 18.3R2, 18.3R3, 18.4R1-S2, 18.4R2, 19.1R1, and all subsequent releases.

This issue is being tracked as PR 1418955 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 known 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:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
High
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."