CVE-2022-22249 : Exploit Details and Defense Strategies

An FPC crash might be seen due to mac-moves within the same bridge domain in Junos OS MX Series.

Understanding CVE-2022-22249

This vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS) by triggering memory corruption.

What is CVE-2022-22249?

An Improper Control of a Resource Through its Lifetime vulnerability in Juniper Networks Junos OS on MX Series leads to FPC crashes due to continuous mac moves within the same bridge domain.

The Impact of CVE-2022-22249

The vulnerability affects multiple versions of Juniper Networks Junos OS on MX Series, potentially causing Denial of Service (DoS) when exploited by an unauthenticated adjacent attacker.

Technical Details of CVE-2022-22249

Vulnerability Description

The vulnerability results in FPC crashes within MX Series due to memory corruption caused by mac moves within the same bridge domain.

Affected Systems and Versions

Juniper Networks Junos OS on MX Series versions prior to 15.1R7-S13, 19.1 versions prior to 19.1R3-S9, and various other versions up to 21.3R2 are affected.

Exploitation Mechanism

The vulnerability can be exploited by an unauthenticated adjacent attacker through continuous mac moves, leading to memory corruption and subsequent FPC crashes.

Mitigation and Prevention

Immediate Steps to Take

To mitigate the risk, use the updated software releases: 15.1R7-S13, 19.1R3-S9, 19.2R3-S6, and subsequent releases.

Long-Term Security Practices

Ensure a minimal bridge domain configuration with two interfaces and consider implementing EVPN MPLS protocols to reduce exposure to the vulnerability.

Patching and Updates

Juniper SIRT is not aware of any known exploits. Update to the latest software releases like 21.1R3, 21.2R3, 21.3R2, and subsequent versions to address and prevent this issue.