Vulnerability identifier: #VU40705

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-3204

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 non-authenticated attacker to perform service disruption.

libreswan 3.9 through 3.12 allows remote attackers to cause a denial of service (daemon restart) via an IKEv1 packet with (1) unassigned bits set in the IPSEC DOI value or (2) the next payload value set to ISAKMP_NEXT_SAK.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libreswan: 3.9 - 3.12

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External links
http://rhn.redhat.com/errata/RHSA-2015-1154.html
http://www.securityfocus.com/bid/75392
http://libreswan.org/security/CVE-2015-3204/CVE-2015-3204.txt
http://security.gentoo.org/glsa/201603-13

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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.