CVE-2024-2357

IKEv2 misconfiguration can cause libreswan to abort and restart

Description

The Libreswan Project was notified of an issue causing libreswan to restart under some IKEv2 retransmit scenarios when a connection is configured to use PreSharedKeys (authby=secret) and the connection cannot find a matching configured secret. When such a connection is automatically added on startup using the auto= keyword, it can cause repeated crashes leading to a Denial of Service.

Remediation

Solution:

This issue is fixed in 4.13, 5.0 and all later versions.

Workaround:

As a workaround, one can place an unguessable long random default secret in /etc/ipsec.secrets, for example using the following command: echo -e "# CVE-2024-2357 workaround : PSK "$(openssl rand -hex 32)"" >> /etc/ipsec.secrets This will ensure a PSK secret is always found, but it will always be wrong, and thus authentication will still properly fail.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.44%

Vendor Advisory libreswan.org

Affected: The Libreswan Project (www.libreswan.org) libreswan

References

Link	Tags
https://libreswan.org/security/CVE-2024-2357	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EJZJYFHKBIJ4ZK5GAWWFFR3AKJS6O5JX/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HEM46ALKF7NG6CAUKZ7KQERVOHWQIQKY/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TVQ7MZY6LFFGRWAJNTKKN2VSEFS2VPAR/

Frequently Asked Questions

What is the severity of CVE-2024-2357?: CVE-2024-2357 has been scored as a medium severity vulnerability.
How to fix CVE-2024-2357?: To fix CVE-2024-2357: This issue is fixed in 4.13, 5.0 and all later versions.
Is CVE-2024-2357 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-2357 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-2024-2357?: CVE-2024-2357 affects The Libreswan Project (www.libreswan.org) libreswan.