SB2023011184 - Use after free in Junos OS Evolved

Security Bulletin ID SB2023011184

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Remote access

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Use after free (CVE-ID: CVE-2023-22402)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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

The vulnerability exists due to use after free error in the kernel. A remote non-authenticated attacker can cause a Denial of Service (DoS).

In a Non Stop Routing (NSR) scenario, an unexpected kernel restart might be observed if "bgp auto-discovery" is enabled and if there is a BGP neighbor flap of auto-discovery sessions for any reason.

This is a race condition which is outside of an attackers direct control and it depends on system internal timing whether this issue occurs.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2023-01-Security-Bulletin-Junos-OS-Evolved-The-kernel-might-restart-in-a-BGP-scenario-where-bgp-auto-discovery-is-enabled-and-such-a-neighbor-flaps-CVE-2023-22402