Denial of service in Junos OS MPLS handling

1) Improper Handling of Exceptional Conditions

EUVDB-ID: #VU65402

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-22202

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a DoS attack.

The vulnerability exists due to improper error handling when processing MPLS packets. A remote attacker on the local network can send specially crafted MPLS packets to the affected device and perform a denial of service attack by crashing the dcpfe process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.1 - 22.1R1-S2

External links

http://supportportal.juniper.net/s/article/2022-07-Security-Bulletin-Junos-OS-PTX-Series-FPCs-may-restart-unexpectedly-upon-receipt-of-specific-MPLS-packets-with-certain-multi-unit-interface-configurations-CVE-2022-22202

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.