CVE-2020-1627

Junos OS: vMX and MX150: Denial of Service vulnerability in packet processing

Description

A vulnerability in Juniper Networks Junos OS on vMX and MX150 devices may allow an attacker to cause a Denial of Service (DoS) by sending specific packets requiring special processing in microcode that the flow cache can't handle, causing the riot forwarding daemon to crash. By continuously sending the same specific packets, an attacker can repeatedly crash the riot process causing a sustained Denial of Service. Flow cache is specific to vMX based products and the MX150, and is enabled by default in performance mode. This issue can only be triggered by traffic destined to the device. Transit traffic will not cause the riot daemon to crash. When the issue occurs, a core dump and riot log file entry are generated. For example: /var/crash/core.J-UKERN.mpc0.1557255993.3864.gz /home/pfe/RIOT logs: fpc0 riot[1888]: PANIC in lu_reorder_send_packet_postproc(): fpc0 riot[6655]: PANIC in lu_reorder_send_packet_postproc(): This issue affects Juniper Networks Junos OS: 18.1 versions prior to 18.1R3 on vMX and MX150; 18.2 versions prior to 18.2R3 on vMX and MX150; 18.2X75 versions prior to 18.2X75-D60 on vMX and MX150; 18.3 versions prior to 18.3R3 on vMX and MX150; 18.4 versions prior to 18.4R2 on vMX and MX150; 19.1 versions prior to 19.1R2 on vMX and MX150. This issue does not affect Junos OS versions prior to 18.1R1.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 18.1R3, 18.2R3, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R2, 19.2R1, 19.3R1, and all subsequent releases.

Workaround:

  • There are no viable workarounds for this issue.
7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.39%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://kb.juniper.net/JSA11006 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-1627?
CVE-2020-1627 has been scored as a high severity vulnerability.
How to fix CVE-2020-1627?
To fix CVE-2020-1627: The following software releases have been updated to resolve this specific issue: 18.1R3, 18.2R3, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R2, 19.2R1, 19.3R1, and all subsequent releases.
Is CVE-2020-1627 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-1627 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-1627?
CVE-2020-1627 affects Juniper Networks Junos OS.
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