Denial of service in Junos OS PFE

1) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU75095

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-2023-28976

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

Exploit availability: No

Description

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

The vulnerability exists due to improper error handling in the packet forwarding engine (pfe). If specific traffic is received on MX Series and its rate exceeds the respective DDoS protection limit the ingress PFE will crash and restart.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.4 - 22.1R1-S2

External links

http://supportportal.juniper.net/s/article/2023-04-Security-Bulletin-Junos-OS-MX-Series-If-a-specific-traffic-rate-goes-above-the-DDoS-threshold-it-will-lead-to-an-FPC-crash-CVE-2023-28976

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.