CVE-2015-3240 Denial of service in n/a

Medium 4.3 Published 9 Nov 2015 Updated 6 Aug 2024

Remote attackers can cause a denial of service in libreswan or Openswan IKE daemons by sending a specific IKE packet with a zero DH value.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2015-3240?

CVE-2015-3240 is a medium-severity denial of service vulnerability in n/a, published on 9 Nov 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-189

Which versions are affected by CVE-2015-3240?

It affects 1 product.

Linux distribution packages (6)

`libreswan` Red Hat:enterprise_linux:7::client	All versions	`0:3.15-5.el7_1`
`libreswan-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:3.15-5.el7_1`
`libreswan` Red Hat:enterprise_linux:7::server	All versions	`0:3.15-5.ael7b_1`
`libreswan-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:3.15-5.ael7b_1`
`libreswan` Red Hat:enterprise_linux:7::workstation	All versions	`0:3.15-5.el7_1`
`libreswan-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:3.15-5.el7_1`

Products include Libreswan Libreswan.

How do I fix CVE-2015-3240?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2015-3240 being exploited?

There is no known exploitation of CVE-2015-3240 in the wild and no public exploit code.

Sources

Also known as GHSA-m56r-f6p2-qgw5, RHSA-2015:1979.