Denial of service in Junos OS and Junos OS Evolved ppmd



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2024-39536
CWE-ID CWE-401
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Juniper Junos OS
Operating systems & Components / Operating system

Junos OS Evolved
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Missing release of memory after effective lifetime

EUVDB-ID: #VU94197

Risk: Medium

CVSSv4.0: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-39536

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing release of memory after effective lifetime error in the Periodic Packet Management Daemon (ppmd). A remote non-authenticated attacker can 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.2R1-S1 - 23.2R1-S2

Junos OS Evolved: 21.2R1-EVO - 22.4R2-S2-EVO

CPE2.3 External links

https://supportportal.juniper.net/s/article/2024-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Flaps-of-BFD-sessions-with-authentication-cause-a-ppmd-memory-leak-CVE-2024-39536


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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