Input validation error in libreswan

1) Input validation error

EUVDB-ID: #VU40606

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-2015-3240

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with NSS, allows remote attackers to cause a denial of service (assertion failure and daemon restart) via a zero DH g^x value in a KE payload in a IKE packet.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libreswan: 3.14

External links

http://rhn.redhat.com/errata/RHSA-2015-1979.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/77536
http://www.securitytracker.com/id/1033418
http://libreswan.org/security/CVE-2015-3240/CVE-2015-3240.txt
http://lists.openswan.org/pipermail/users/2015-August/023401.html
http://security.gentoo.org/glsa/201603-13

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.