Debian Security Advisory DSA 3118-1 (strongswan - security update)

# OpenVAS Vulnerability Test
# $Id: deb_3118.nasl 6609 2017-07-07 12:05:59Z cfischer $
# Auto-generated from advisory DSA 3118-1 using nvtgen 1.0
# Script version: 1.0
#
# Author:
# Greenbone Networks
#
# Copyright:
# Copyright (c) 2015 Greenbone Networks GmbH http://greenbone.net
# Text descriptions are largely excerpted from the referenced
# advisory, and are Copyright (c) the respective author(s)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#


if(description)
{
    script_id(703118);
    script_version("$Revision: 6609 $");
    script_cve_id("CVE-2014-9221");
    script_name("Debian Security Advisory DSA 3118-1 (strongswan - security update)");
    script_tag(name: "last_modification", value: "$Date: 2017-07-07 14:05:59 +0200 (Fri, 07 Jul 2017) $");
    script_tag(name: "creation_date", value: "2015-01-05 00:00:00 +0100 (Mon, 05 Jan 2015)");
    script_tag(name:"cvss_base", value:"5.0");
    script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
    script_tag(name: "solution_type", value: "VendorFix");

    script_xref(name: "URL", value: "http://www.debian.org/security/2015/dsa-3118.html");


    script_category(ACT_GATHER_INFO);

    script_copyright("Copyright (c) 2015 Greenbone Networks GmbH http://greenbone.net");
    script_family("Debian Local Security Checks");
    script_dependencies("gather-package-list.nasl");
    script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages");
    script_tag(name: "affected",  value: "strongswan on Debian Linux");
    script_tag(name: "insight",   value: "The strongSwan VPN suite is based on
the IPsec stack in standard Linux 2.6 kernels. It supports both the IKEv1 and
IKEv2 protocols.");
    script_tag(name: "solution",  value: "For the stable distribution (wheezy),
this problem has been fixed in version 4.5.2-1.5+deb7u6.

For the upcoming stable distribution (jessie), this problem has been
fixed in version 5.2.1-5.

For the unstable distribution (sid), this problem has been fixed in
version 5.2.1-5.

We recommend that you upgrade your strongswan packages.");
    script_tag(name: "summary",   value: "Mike Daskalakis reported a denial of
service vulnerability in charon, the IKEv2 daemon for strongSwan, an IKE/IPsec
suite used to establish IPsec protected links.

The bug can be triggered by an IKEv2 Key Exchange (KE) payload that
contains the Diffie-Hellman (DH) group 1025. This identifier is from the
private-use range and only used internally by libtls for DH groups with
custom generator and prime (MODP_CUSTOM). As such the instantiated
method expects that these two values are passed to the constructor. This
is not the case when a DH object is created based on the group in the KE
payload. Therefore, an invalid pointer is dereferenced later, which
causes a segmentation fault.

This means that the charon daemon can be crashed with a single
IKE_SA_INIT message containing such a KE payload. The starter process
should restart the daemon after that, but this might increase load on
the system. Remote code execution is not possible due to this issue, nor
is IKEv1 affected in charon or pluto.");
    script_tag(name: "vuldetect", value: "This check tests the installed
software version using the apt package manager.");
    script_tag(name:"qod_type", value:"package");
    exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-deb.inc");

res = "";
report = "";
if ((res = isdpkgvuln(pkg:"libstrongswan", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan-dbg", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan-ikev1", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan-ikev2", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan-nm", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"strongswan-starter", ver:"4.5.2-1.5+deb7u6", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}

if (report != "") {
    security_message(data:report);
} else if (__pkg_match) {
    exit(99); # Not vulnerable.
}