CVE-2024-3652

IKEv1 default AH/ESP responder can cause libreswan to abort and restart

Description

The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifying an esp= line. When the peer requests AES-GMAC, libreswan's default proposal handler causes an assertion failure and crashes and restarts. IKEv2 connections are not affected.

Remediation

Solution:

  • This issue is fixed in 4.15 and all later versions.

Workaround:

  • As a workaround, adding an esp= line to all IKEv1 connections works around the issue. An example covering most common default configurations would be: esp=aes-sha2_512,aes-sha1,aes-sha2_256,aes-md5,3des-sha1,3des-md5.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Vendor Advisory libreswan.org
Affected: The Libreswan Project (www.libreswan.org) libreswan
Published at:
Updated at:

References

Link Tags
https://libreswan.org/security/CVE-2024-3652 vendor advisory
http://www.openwall.com/lists/oss-security/2024/04/18/2

Frequently Asked Questions

What is the severity of CVE-2024-3652?
CVE-2024-3652 has been scored as a medium severity vulnerability.
How to fix CVE-2024-3652?
To fix CVE-2024-3652: This issue is fixed in 4.15 and all later versions.
Is CVE-2024-3652 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-3652 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-3652?
CVE-2024-3652 affects The Libreswan Project (www.libreswan.org) libreswan.
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