QID 44116

QID 44116: Juniper Networks Junos OS An l2cpd Crash Leading to a Denial of Service (CVE-2023-36839)

An Improper Validation of Specified Quantity in Input vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker who sends specific LLDP packets to cause a Denial of Service(DoS).

This issue affects:
Juniper Networks Junos OS
All versions prior to 20.4R3-S8;
21.1 version 21.1R1 and later versions;
21.2 versions prior to 21.2R3-S5;
21.3 versions prior to 21.3R3-S4;
21.4 versions prior to 21.4R3-S3;
22.1 versions prior to 22.1R3-S2;
22.2 versions prior to 22.2R3;
22.3 versions prior to 22.3R2-S2;
22.4 versions prior to 22.4R2;

QID detection logic: (Authenticated)

It checks for vulnerable Junos OS version.

The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected.

CVSS V3 rated as High - 6.5 severity.

CVSS V2 rated as Medium - 3.3 severity.

Solution

Vendor has released patch addressing the vulnerabilities, for more information please refer JSA73171

Workaround:

Workaround
If LLDP and its services are not required, customers can disable LLDP. Disabling telemetry polling also mitigates the issue.

Vendor References

JSA73171 - supportportal.juniper.net/JSA73171

CVEs related to QID 44116

CVE-2023-36839 |

Software Advisories

Advisory ID	Software	Component	Link
JSA73171			supportportal.juniper.net/JSA73171

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