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CVE
PUBLISHED

CVE-2024-39536

Junos OS and Junos OS Evolved: Flaps of BFD sessions with authentication cause a ppmd memory leak

Assignerjuniper
Reserved2024-06-25
Published2024-07-11
Updated2024-07-12

Description

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.



MEDIUM: 5.3CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
MEDIUM: 6.0CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-401 Missing Release of Memory after Effective Lifetime

Denial-of-Service (DoS)

Product status

Default status
unaffected

Any version before 21.2R3-S8
affected

21.4 before 21.4R3-S7
affected

22.1 before 22.1R3-S4
affected

22.2 before 22.2R3-S4
affected

22.3 before 22.3R3
affected

22.4 before 22.4R2-S2, 22.4R3
affected

Default status
unaffected

21.2-EVO before 21.2R3-S8-EVO
affected

21.4-EVO before 21.4R3-S7-EVO
affected

22.2-EVO before 22.2R3-S4-EVO
affected

22.3-EVO before 22.3R3-EVO
affected

22.4-EVO before 22.4R3-EVO
affected

23.2-EVO before 23.2R1-EVO
affected

References

https://supportportal.juniper.net/JSA82996 vendor-advisory

cve.org CVE-2024-39536

nvd.nist.gov CVE-2024-39536

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