Denial of service in Junos OS and Junos OS Evolved rpd

1) Time-of-check Time-of-use (TOCTOU) Race Condition

EUVDB-ID: #VU68272

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-22225

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Exploit availability: No

Description

The vulnerability allows a remote attacker to preform a denial of service (DoS) attack.

The vulnerability exists due to a race condition in the Routing Protocol Daemon (rpd). In a BGP multipath scenario, when one of the contributing routes is flapping often and rapidly, rpd may crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4 - 21.3R1-S1-EVO

Juniper Junos OS: 19.2 - 21.3R1-S2

External links

http://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-a-BGP-multipath-scenario-when-one-of-the-contributing-routes-is-flapping-often-and-rapidly-rpd-may-crash-CVE-2022-22225

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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