Vulnerability identifier: #VU82484

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-2023-22411

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

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

Vendor: Juniper Networks, Inc.

Description

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

The vulnerability exists due to out-of-bounds write error in Flow Processing Daemon (flowd). A remote non-authenticated attacker can cause Denial of Service (DoS).

 On SRX Series devices using Unified Policies with IPv6, when a specific IPv6 packet goes through a dynamic-application filter which will generate an ICMP deny message, the flowd core is observed and the PFE is restarted.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.4 - 19.4R3-S8, 19.4R1 - 19.4R1-S4, 20.2 - 20.2R3-S4, 19.2 - 19.2R3-S5, 19.2R1-S4, 21.4R1 - 21.4R1-S2, 20.3 - 20.3R3-S3, 19.3 - 19.3R3-S5, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 20.4 - 20.4R3-S2, 21.2R1 - 21.2R2-S2, 21.3R1 - 21.3R1-S2, 21.1 - 21.1R2-S2

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External links
http://supportportal.juniper.net/s/article/2023-01-Security-Bulletin-Junos-OS-SRX-Series-The-flowd-daemon-will-crash-when-Unified-Policies-are-used-with-IPv6-and-certain-dynamic-applications-are-rejected-by-the-device-CVE-2023-22411

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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.