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

# OpenVAS Vulnerability Test
# $Id: deb_3223.nasl 14278 2019-03-18 14:47:26Z 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_oid("1.3.6.1.4.1.25623.1.0.703223");
  script_version("$Revision: 14278 $");
  script_cve_id("CVE-2015-1798", "CVE-2015-1799");
  script_name("Debian Security Advisory DSA 3223-1 (ntp - security update)");
  script_tag(name:"last_modification", value:"$Date: 2019-03-18 15:47:26 +0100 (Mon, 18 Mar 2019) $");
  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", re:"ssh/login/release=DEB7");
  script_tag(name:"affected", value:"ntp on Debian Linux");
  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:"DEB7")) != NULL) {
  report += res;
}
if((res = isdpkgvuln(pkg:"ntp-doc", ver:"1:4.2.6.p5+dfsg-2+deb7u4", rls:"DEB7")) != NULL) {
  report += res;
}
if((res = isdpkgvuln(pkg:"ntpdate", ver:"1:4.2.6.p5+dfsg-2+deb7u4", rls:"DEB7")) != NULL) {
  report += res;
}

if(report != "") {
  security_message(data:report);
} else if (__pkg_match) {
  exit(99);
}