An Unchecked Return Value to NULL Pointer Dereference vulnerability in Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a locally authenticated attacker with low privileges to cause a Denial of Service (DoS).

In Segment Routing (SR) to Label Distribution Protocol (LDP) interworking scenario, configured with Segment Routing Mapping Server (SRMS) at any node, when an Area Border Router (ABR) leaks the SRMS entries having "S" flag set from IS-IS Level 2 to Level 1, an rpd core might be observed when a specific low privileged CLI command is issued.

This issue affects:

Juniper Networks Junos OS

• 21.4 versions prior to 21.4R1-S2, 21.4R2-S1, 21.4R3;
• 22.1 versions prior to 22.1R2.

Juniper Networks Junos OS Evolved

• 21.4-EVO versions prior to 21.4R1-S2-EVO, 21.4R2-S1-EVO, 21.4R3-EVO;
• 22.1-EVO versions prior to 22.1R2-EVO.

This issue does not affect:

Juniper Networks Junos OS versions prior to 21.4R1.

Juniper Networks Junos OS Evolved versions prior to 21.4R1.

To be affected by the issue the device needs to be configured with ISIS L2 and L1 (neither disabled) and Segment Routing:

[protocols isis interface <interface>]
[protocols isis source-packet-routing]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2022-22233.

The following software releases have been updated to resolve this specific issue:

Junos OS: 21.4R1-S2, 21.4R2-S1, 21.4R3, 22.1R2, 22.2R1 and all subsequent releases.

Junos OS Evolved: 21.4R1-S2-EVO, 21.4R2-S1-EVO, 21.4R3-EVO, 22.1R2-EVO, 22.2R1-EVO and all subsequent releases.

This issue is being tracked as PR 1662559 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

IMPLEMENTATION:

Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/.

There are no known workarounds for this issue.

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2022-22233 at cve.mitre.org