Debian Security Advisory DSA 3222-1 (chrony - security update)

2015-04-12T00:00:00
ID OPENVAS:703222
Type openvas
Reporter Copyright (c) 2015 Greenbone Networks GmbH http://greenbone.net
Modified 2017-07-07T00:00:00

Description

Miroslav Lichvar of Red Hat discovered multiple vulnerabilities in chrony, an alternative NTP client and server:

CVE-2015-1821 Using particular address/subnet pairs when configuring access control would cause an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

CVE-2015-1822 When allocating memory to save unacknowledged replies to authenticated command requests, a pointer would be left uninitialized, which could trigger an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

CVE-2015-1853 When peering with other NTP hosts using authenticated symmetric association, the internal state variables would be updated 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.

                                        
                                            # OpenVAS Vulnerability Test
# $Id: deb_3222.nasl 6609 2017-07-07 12:05:59Z cfischer $
# Auto-generated from advisory DSA 3222-1 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(703222);
    script_version("$Revision: 6609 $");
    script_cve_id("CVE-2015-1821", "CVE-2015-1822", "CVE-2015-1853");
    script_name("Debian Security Advisory DSA 3222-1 (chrony - security update)");
    script_tag(name: "last_modification", value: "$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: "10.0");
    script_tag(name: "cvss_base_vector", value: "AV:N/AC:L/Au:N/C:C/I:C/A:C");
    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-3222.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: "chrony on Debian Linux");
    script_tag(name: "insight",   value: "It consists of a pair of programs :
`chronyd'. This is a daemon which runs in background on the system. It
obtains measurements (e.g. via the network) of the system's offset
relative to other systems, and adjusts the system time accordingly. For
isolated systems, the user can periodically enter the correct time by hand
(using `chronyc'). In either case, `chronyd' determines the rate at which
the computer gains or loses time, and compensates for this. Chronyd
implements the NTP protocol and can act as either a client or a server.
`chronyc'. This is a command-line driven control and monitoring program.
An administrator can use this to fine-tune various parameters within the
daemon, add or delete servers etc whilst the daemon is running.");
    script_tag(name: "solution",  value: "For the stable distribution (wheezy),
these problems have been fixed in version 1.24-3.1+deb7u3.

For the unstable distribution (sid), these problems have been fixed in
version 1.30-2.

We recommend that you upgrade your chrony packages.");
    script_tag(name: "summary",   value: "Miroslav Lichvar of Red Hat discovered
multiple vulnerabilities in chrony, an alternative NTP client and server:

CVE-2015-1821 
Using particular address/subnet pairs when configuring access control
would cause an invalid memory write. This could allow attackers to
cause a denial of service (crash) or execute arbitrary code.

CVE-2015-1822 
When allocating memory to save unacknowledged replies to authenticated
command requests, a pointer would be left uninitialized, which could
trigger an invalid memory write. This could allow attackers to cause a
denial of service (crash) or execute arbitrary code.

CVE-2015-1853 
When peering with other NTP hosts using authenticated symmetric
association, the internal state variables would be updated 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.");
    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:"chrony", ver:"1.24-3.1+deb7u3", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}

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