Vulnerability identifier: #VU75709

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-30570

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libreswan
Universal components / Libraries / Libraries used by multiple products

Vendor: libreswan.org

Description

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

The vulnerability exists due to incorrect handling of unsupported algorithms (such as DH2) when processing IKEv1 Aggressive Mode packets in libreswan pluto daemon. A remote attacker can send a specially crafted IKEv1 Aggressive Mode packet to the daemon and crash it.

Successful exploitation of the vulnerability requires that the libreswan pluto daemon is configured explicitly with "aggressive=yes" (or "aggrmode=yes") and accepts IKEv1 packets.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libreswan: 3.28 - 4.10

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External links
http://libreswan.org/security/CVE-2023-30570/CVE-2023-30570.txt
http://github.com/libreswan/libreswan/releases/tag/v4.11

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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