SB2024071545 - Denial of service in Junos OS chassisd

Security Bulletin ID SB2024071545

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) Improper check for unusual or exceptional conditions (CVE-ID: CVE-2024-39530)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/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 improper check for unusual or exceptional conditions error in the chassis management daemon (chassisd). A remote non-authenticated attacker can cause a Denial-of-Service (DoS).

If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2024-07-Security-Bulletin-Junos-OS-Attempting-to-access-specific-sensors-on-platforms-not-supporting-these-will-lead-to-a-chassisd-crash-CVE-2024-39530