Denial of service in libreswan IKEv1 implementation

1) Input validation error

EUVDB-ID: #VU75709

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 - Improper input validation

Exploit availability: No

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

External links

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

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.