Improper check for unusual or exceptional conditions in Junos OS Evolved and Juniper Junos OS

1) Improper check for unusual or exceptional conditions

EUVDB-ID: #VU88437

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-2024-30402

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

Exploit availability: No

Description

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

The vulnerability exists due to an improper check for unusual or exceptional conditions error in the Layer 2 Address Learning Daemon (l2ald). A remote non-authenticated attacker can cause a Denial of Service (DoS).

When telemetry requests are sent to the device, and the Dynamic Rendering Daemon (drend) is suspended, the l2ald crashes and restarts due to factors outside the attackers control.

Repeated occurrences of these events causes a sustained DoS condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 21.4R1-EVO - 23.2R1-S2-EVO

Juniper Junos OS: 20.4R1 - 23.4R1-S1

External links

http://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-The-l2ald-crashes-on-receiving-telemetry-messages-from-a-specific-subscription-CVE-2024-30402

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.