Vulnerability identifier: #VU65372

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-22215

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
Junos OS Evolved
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

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

The vulnerability exists due to failure to release file descriptors (e.g. delete the "respective/var/run/.env" file) in plugable authentication module (PAM) when handling gRPC connection termination events. A remote attacker can trigger inode exhaustion by initiating and terminating a large number of gRPC connections and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.2 - 20.2R3-S4, 19.2 - 19.2R3-S5, 19.2R1-S4, 20.3 - 20.3R3-S3, 19.4 - 19.4R2-S5, 19.4R1 - 19.4R1-S4, 19.1 - 19.1R3-S7, 19.1R1-S4, 19.3 - 19.3R3-S4, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 21.1 - 21.1R2-S2, 21.2R1 - 21.2R1-S2, 20.4 - 20.4R2-S2

Junos OS Evolved: 21.2-EVO - 21.2R1-EVO, 21.1 - 21.1R3-EVO, 20.4 - 20.4R2-S3-EVO, 20.4R2-S2-EVO, 21.3-EVO

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External links
http://supportportal.juniper.net/s/article/2022-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-var-run-pid-env-files-are-potentially-not-deleted-during-termination-of-a-gRPC-connection-causing-inode-exhaustion-CVE-2022-22215

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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.