Vulnerabilities > CVE-2020-10030 - Out-of-bounds Read vulnerability in Powerdns Recursor

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2020-698.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(136885);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/28");

  script_cve_id("CVE-2020-10030", "CVE-2020-10995", "CVE-2020-12244");

  script_name(english:"openSUSE Security Update : pdns-recursor (openSUSE-2020-698)");
  script_summary(english:"Check for the openSUSE-2020-698 patch");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for pdns-recursor fixes the following issues :

  - update to 4.1.16

  - fixes an issue where records in the answer section of a
    NXDOMAIN response lacking an SOA were not properly
    validated (CVE-2020-12244, boo#1171553)

  - fixes an issue where invalid hostname on the server can
    result in disclosure of invalid memory (CVE-2020-10030,
    boo#1171553)

  - fixes an issue in the DNS protocol has been found that
    allows malicious parties to use recursive DNS services
    to attack third party authoritative name servers
    (CVE-2020-10995, boo#1171553)

For details see
https://doc.powerdns.com/recursor/changelog/4.1.html#change-4.1.16"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1171553"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://doc.powerdns.com/recursor/changelog/4.1.html#change-4.1.16"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Update the affected pdns-recursor packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:pdns-recursor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:pdns-recursor-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:pdns-recursor-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.1");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/26");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE15\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.1", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.1", reference:"pdns-recursor-4.1.12-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"pdns-recursor-debuginfo-4.1.12-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"pdns-recursor-debugsource-4.1.12-lp151.3.3.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "pdns-recursor / pdns-recursor-debuginfo / pdns-recursor-debugsource");
}

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2020 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(136942);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/05");

  script_cve_id("CVE-2020-10030", "CVE-2020-10995", "CVE-2020-12244");

  script_name(english:"FreeBSD : powerdns-recursor -- multiple vulnerabilities (f9c5a410-9b4e-11ea-ac3f-6805ca2fa271)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"PowerDNS Team reports :

CVE-2020-10995: An issue in the DNS protocol has been found that allow
malicious parties to use recursive DNS services to attack third party
authoritative name servers. The attack uses a crafted reply by an
authoritative name server to amplify the resulting traffic between the
recursive and other authoritative name servers. Both types of service
can suffer degraded performance as an effect.

CVE-2020-12244: An issue has been found in PowerDNS Recursor 4.1.0
through 4.3.0 where records in the answer section of a NXDOMAIN
response lacking an SOA were not properly validated in
SyncRes::processAnswer. This would allow an attacker in position of
man-in-the-middle to send a NXDOMAIN answer for a name that does
exist, bypassing DNSSEC validation.

CVE-2020-10030: An issue has been found in PowerDNS Authoritative
Server allowing an attacker with enough privileges to change the
system's hostname to cause disclosure of uninitialized memory content
via a stack-based out-of-bounds read. It only occurs on systems where
gethostname() does not null-terminate the returned string if the
hostname is larger than the supplied buffer. Linux systems are not
affected because the buffer is always large enough. OpenBSD systems
are not affected because the returned hostname is always
null-terminated. Under some conditions this issue can lead to the
writing of one null-byte out-of-bounds on the stack, causing a denial
of service or possibly arbitrary code execution."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://doc.powerdns.com/recursor/security-advisories/index.html"
  );
  # https://vuxml.freebsd.org/freebsd/f9c5a410-9b4e-11ea-ac3f-6805ca2fa271.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?72d79f2a"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:powerdns-recursor");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/28");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"powerdns-recursor>=4.3.0<4.3.1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"powerdns-recursor>=4.2.0<4.2.2")) flag++;
if (pkg_test(save_report:TRUE, pkg:"powerdns-recursor>=4.1.0<4.1.16")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");