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Product Affected

This issue affects all versions of Junos OS and Junos OS Evolved.

Severity

Medium

Severity Assessment (CVSS) Score

5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Problem

Multiple vulnerabilities in the CLI commands of Juniper Networks Junos OS and Junos OS Evolved allows a local low privileged attacker to execute specific CLI commands leading to Denial of Service.

Repeated execution by the attacker will create a sustained Denial of Service (DoS) condition.

These issues affects Juniper Networks:

Junos OS:
All versions prior to 20.4R3-S8;
21.2 versions prior to 21.2R3-S6;
21.3 versions prior to 21.3R3-S5;
21.4 versions prior to 21.4R3-S4;
22.1 versions prior to 22.1R3-S3;
22.2 versions prior to 22.2R3-S1;
22.3 versions prior to 22.3R3;
22.4 versions prior to 22.4R2.

Junos OS Evolved:
All versions prior to 20.4R3-S8-EVO;
21.2 versions prior to 21.2R3-S6-EVO;
21.3 versions prior to 21.3R3-S5-EVO;
21.4 versions prior to 21.4R3-S4-EVO;
22.1 versions prior to 22.1R3-S3-EVO;
22.2 versions prior to 22.2R3-S1-EVO;
22.3 versions prior to 22.3R3-EVO;
22.4 versions prior to 22.4R2-EVO.

Note: Junos OS Evolved is unaffected by CVE-2023-44176 and CVE-2023-44178.

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

This issue was discovered during external security research.

The specific issues reported and resolved are listed below:

CVE	CVSS	Summary
CVE-2023-44176	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)	A Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos OS allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service. Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition.
CVE-2023-44177	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)	A Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos and Junos EVO allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service. Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition.
CVE-2023-44178	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)	A Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos OS allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service. Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition.

Solution

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

Junos OS: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 22.1R3-S3, 22.2R3-S1, 22.3R3, 23.2R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.3R3-S5-EVO, 21.4R3-S4-EVO, 22.1R3-S3-EVO, 22.2R3-S1-EVO. 22.3R3-EVO, 22.4R2-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1720517, 1723674 and 1720521 which are visible on the Customer Support website.

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

Workaround

To reduce the risk of malicious exploitation use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

There are no known workarounds for this issue.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History