CVE-2023-36848: Junos OS: MX Series: The FPC will crash on receiving a malformed CFM packet
An Improper Handling of Undefined Values vulnerability in the periodic packet management daemon (PPMD) of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600) allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).
When a malformed CFM packet is received, it leads to an FPC crash. Continued receipt of these packets causes a sustained denial of service. This vulnerability occurs only when CFM has been configured on the interface.
This issue affects Juniper Networks Junos OS: versions prior to 19.1R3-S10 on MX Series; 19.2 versions prior to 19.2R3-S7 on MX Series; 19.3 versions prior to 19.3R3-S8 on MX Series; 19.4 versions prior to 19.4R3-S12 on MX Series; 20.1 version 20.1R1 and later versions on MX Series; 20.2 versions prior to 20.2R3-S8 on MX Series; 20.3 version 20.3R1 and later versions on MX Series; 20.4 versions prior to 20.4R3-S7 on MX Series; 21.1 versions prior to 21.1R3-S5 on MX Series; 21.2 versions prior to 21.2R3-S5 on MX Series; 21.3 versions prior to 21.3R3-S4 on MX Series; 21.4 versions prior to 21.4R3-S4 on MX Series; 22.1 versions prior to 22.1R3-S3 on MX Series; 22.2 versions prior to 22.2R3-S1 on MX Series; 22.3 versions prior to 22.3R3 on MX Series; 22.4 versions prior to 22.4R1-S2, 22.4R2 on MX Series.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 19.2R3-S7 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 19.3R3-S8 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 19.4R3-S12 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 20.2R3-S8 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 20.4R3-S7 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.1R3-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.2R3-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.3R3-S4 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.4R3-S4 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.1R3-S3 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.2R3-S1 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.3R3 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.4R1-S2 - Upgrade
Upgrade
Juniper Networks Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.4R2 - Configuration
This vulnerability occurs only when CFM has been configured on the interface; if CFM is not required, unconfigure/disable CFM on affected interfaces to prevent malformed CFM packets from triggering an FPC crash.
Juniper Networks Junos OS (MX Series) - CFM CFM on interface = remove/disable
Event History
Frequently Asked Questions
What is the severity of CVE-2023-36848?
CVE-2023-36848 has a severity rating that indicates it can lead to a Denial of Service (DoS) when exploited.
How do I fix CVE-2023-36848?
To fix CVE-2023-36848, you should update your Junos OS to the latest version that addresses this vulnerability.
What types of Junos OS versions are affected by CVE-2023-36848?
CVE-2023-36848 affects various versions of Junos OS, particularly version 19.1 and its subsequent releases.
Who can exploit CVE-2023-36848?
CVE-2023-36848 can be exploited by an unauthenticated adjacent attacker.
What is the impact of CVE-2023-36848?
The impact of CVE-2023-36848 is that it allows an attacker to cause a Denial of Service (DoS) on affected devices.