Improper validation of syntactic correctness of input in Juniper Junos OS

1) Improper validation of syntactic correctness of input

EUVDB-ID: #VU85282

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-2024-21616

CWE-ID: CWE-1286 - Improper Validation of Syntactic Correctness of Input

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 improper validation of syntactic correctness of input error in Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause Denial of Service (DoS).

On all Junos OS MX Series and SRX Series platforms, when SIP ALG is enabled, and a specific SIP packet is received and processed, NAT IP allocation fails for genuine traffic, which causes Denial of Service (DoS).

Continuous receipt of this specific SIP ALG packet will cause a sustained DoS condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.2R1 - 22.4R2-S1

External links

http://supportportal.juniper.net/s/article/2024-01-Security-Bulletin-Junos-OS-Processing-of-a-specific-SIP-packet-causes-NAT-IP-allocation-to-fail-CVE-2024-21616

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.