Debian Security Advisory DSA 3223-1 (ntp - security update)

# OpenVAS Vulnerability Test
# $Id: deb_3223.nasl 6609 2017-07-07 12:05:59Z cfischer $
# Auto-generated from advisory DSA 3223-1 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(703223);
    script_version("$Revision: 6609 $");
    script_cve_id("CVE-2015-1798", "CVE-2015-1799");
    script_name("Debian Security Advisory DSA 3223-1 (ntp - security update)");
    script_tag(name: "last_modification", value: "$Date: 2017-07-07 14:05:59 +0200 (Fri, 07 Jul 2017) $");
    script_tag(name: "creation_date", value: "2015-04-12 00:00:00 +0200 (Sun, 12 Apr 2015)");
    script_tag(name:"cvss_base", value:"4.3");
    script_tag(name:"cvss_base_vector", value:"AV:A/AC:M/Au:N/C:N/I:P/A:P");
    script_tag(name: "solution_type", value: "VendorFix");
    script_tag(name: "qod_type", value: "package");

    script_xref(name: "URL", value: "http://www.debian.org/security/2015/dsa-3223.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: "ntp on Debian Linux");
    script_tag(name: "insight",   value: "NTP, the Network Time Protocol,
is used to keep computer clocks accurate by synchronizing them over the
Internet or a local network, or by following an accurate hardware receiver
that interprets GPS, DCF-77, NIST or similar time signals.");
    script_tag(name: "solution",  value: "For the stable distribution (wheezy),
these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u4.

For the unstable distribution (sid), these problems have been fixed in
version 1:4.2.6.p5+dfsg-7.

We recommend that you upgrade your ntp packages.");
    script_tag(name: "summary",   value: "Multiple vulnerabilities were
discovered in ntp, an implementation of the Network Time Protocol:

CVE-2015-1798 
When configured to use a symmetric key with an NTP peer, ntpd would
accept packets without MAC as if they had a valid MAC. This could
allow a remote attacker to bypass the packet authentication and send
malicious packets without having to know the symmetric key.

CVE-2015-1799 
When peering with other NTP hosts using authenticated symmetric
association, ntpd would update its internal state variables before
the MAC of the NTP messages was validated. This could allow a remote
attacker to cause a denial of service by impeding synchronization
between NTP peers.

Additionally, it was discovered that generating MD5 keys using ntp-keygen
on big endian machines would either trigger an endless loop, or generate
non-random keys.");
    script_tag(name: "vuldetect", value: "This check tests the installed
software version using the apt package manager.");
    exit(0);
}

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

res = "";
report = "";
if ((res = isdpkgvuln(pkg:"ntp", ver:"1:4.2.6.p5+dfsg-2+deb7u4", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"ntp-doc", ver:"1:4.2.6.p5+dfsg-2+deb7u4", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"ntpdate", ver:"1:4.2.6.p5+dfsg-2+deb7u4", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}

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