Debian Security Advisory DSA 3097-1 (unbound - security update)

2014-12-10T00:00:00
ID OPENVAS:703097
Type openvas
Reporter Copyright (c) 2015 Greenbone Networks GmbH http://greenbone.net
Modified 2018-03-19T00:00:00

Description

Florian Maury from ANSSI discovered that unbound, a validating, recursive, and caching DNS resolver, was prone to a denial of service vulnerability. An attacker crafting a malicious zone and able to emit (or make emit) queries to the server can trick the resolver into following an endless series of delegations, leading to resource exhaustion and huge network usage.

                                        
                                            # OpenVAS Vulnerability Test
# $Id: deb_3097.nasl 9136 2018-03-19 13:08:02Z cfischer $
# Auto-generated from advisory DSA 3097-1 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(703097);
    script_version("$Revision: 9136 $");
    script_cve_id("CVE-2014-8602");
    script_name("Debian Security Advisory DSA 3097-1 (unbound - security update)");
    script_tag(name: "last_modification", value: "$Date: 2018-03-19 14:08:02 +0100 (Mon, 19 Mar 2018) $");
    script_tag(name: "creation_date", value: "2014-12-10 00:00:00 +0100 (Wed, 10 Dec 2014)");
    script_tag(name:"cvss_base", value:"4.3");
    script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/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/2014/dsa-3097.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: "unbound on Debian Linux");
    script_tag(name: "insight",   value: "Unbound is a recursive-only caching DNS
server which can perform DNSSEC validation of results. It implements only a minimal
amount of authoritative service to prevent leakage to the root nameservers: forward
lookups for localhost, reverse for 127.0.0.1 and ::1, and NXDOMAIN for zones served
by AS112. Stub and forward zones are supported.");
    script_tag(name: "solution",  value: "For the stable distribution (wheezy), this
problem has been fixed in version 1.4.17-3+deb7u2.

For the upcoming stable distribution (jessie), this problem has been
fixed in version 1.4.22-3.

For the unstable distribution (sid), this problem has been fixed in
version 1.4.22-3.

We recommend that you upgrade your unbound packages.");
    script_tag(name: "summary",   value: "Florian Maury from ANSSI discovered that
unbound, a validating, recursive, and caching DNS resolver, was prone to a denial
of service vulnerability. An attacker crafting a malicious zone and able to emit
(or make emit) queries to the server can trick the resolver into
following an endless series of delegations, leading to resource
exhaustion and huge network usage.");
    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:"libunbound-dev", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"libunbound2", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"python-unbound", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"unbound", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"unbound-anchor", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}
if ((res = isdpkgvuln(pkg:"unbound-host", ver:"1.4.17-3+deb7u2", rls_regex:"DEB7.[0-9]")) != NULL) {
    report += res;
}

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