CVE-2024-39536: Junos OS and Junos OS Evolved: Flaps of BFD sessions with authentication cause a ppmd memory leak
First published: Thu Jul 11 2024(Updated: )
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS). When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode. Whether the leak occurs can be monitored with the following CLI command: > show ppm request-queue FPC Pending-request fpc0 2 request-total-pending: 2 where a continuously increasing number of pending requests is indicative of the leak. This issue affects: Junos OS: * All versions before 21.2R3-S8, * 21.4 versions before 21.4R3-S7, * 22.1 versions before 22.1R3-S4, * 22.2 versions before 22.2R3-S4, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R2-S2, 22.4R3. Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * 21.4-EVO versions before 21.4R3-S7-EVO, * 22.2-EVO versions before 22.2R3-S4-EVO, * 22.3-EVO versions before 22.3R3-EVO, * 22.4-EVO versions before 22.4R3-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper JUNOS | <21.2R3-S8<21.4R3-S7<22.1R3-S4<22.2R3-S4<22.3R3<22.4R2-S2<22.4R3 | |
| Juniper Networks Junos OS | <21.2R3-S8-EVO<21.4R3-S7-EVO<22.2R3-S4-EVO<22.3R3-EVO<22.4R3-EVO |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S8, 21.4R3-S7, 22.1R3-S4, 22.2R3-S4, 22.3R3, 22.4R2-S2, 22.4R3, 23.2R1, and all subsequent releases; Junos OS Evolved: 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-39536?
CVE-2024-39536 is classified as a Denial-of-Service (DoS) vulnerability.
How does CVE-2024-39536 affect Juniper Networks devices?
CVE-2024-39536 allows an unauthenticated adjacent attacker to cause a Denial-of-Service in affected Junos OS and Junos OS Evolved devices.
Which versions of Junos OS are affected by CVE-2024-39536?
Versions up to and including 21.2R3-S8, 21.4R3-S7, 22.1R3-S4, 22.2R3-S4, 22.3R3, and 22.4R2-S2 for Junos OS are affected.
What steps should be taken to mitigate CVE-2024-39536?
To mitigate CVE-2024-39536, it is recommended to upgrade to the patched versions of Junos OS or apply any available security updates.
Can CVE-2024-39536 be exploited remotely?
Yes, CVE-2024-39536 can be exploited by an unauthenticated adjacent attacker.
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