Debian DLA-2227-1 : bind9 security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2227-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(136983);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/08");

  script_cve_id("CVE-2020-8616", "CVE-2020-8617");

  script_name(english:"Debian DLA-2227-1 : bind9 security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Several vulnerabilities were discovered in BIND, a DNS server
implementation.

CVE-2020-8616

It was discovered that BIND does not sufficiently limit the number of
fetches performed when processing referrals. An attacker can take
advantage of this flaw to cause a denial of service (performance
degradation) or use the recursing server in a reflection attack with a
high amplification factor.

CVE-2020-8617

It was discovered that a logic error in the code which checks TSIG
validity can be used to trigger an assertion failure, resulting in
denial of service.

For Debian 8 'Jessie', these problems have been fixed in version
1:9.9.5.dfsg-9+deb8u19.

We recommend that you upgrade your bind9 packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/jessie/bind9");
  script_set_attribute(attribute:"solution", value:
"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-8616");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dnsutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind-export-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind9-90");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdns-export100");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdns-export100-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdns100");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libirs-export91");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libirs-export91-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisc-export95");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisc-export95-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisc95");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccc90");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccfg-export90");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccfg-export90-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccfg90");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblwres90");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lwresd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"8.0", prefix:"bind9", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"bind9-doc", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"bind9-host", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"bind9utils", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"dnsutils", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"host", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libbind-dev", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libbind-export-dev", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libbind9-90", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libdns-export100", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libdns-export100-udeb", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libdns100", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libirs-export91", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libirs-export91-udeb", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisc-export95", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisc-export95-udeb", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisc95", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisccc90", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisccfg-export90", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisccfg-export90-udeb", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"libisccfg90", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"liblwres90", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;
if (deb_check(release:"8.0", prefix:"lwresd", reference:"1:9.9.5.dfsg-9+deb8u19")) flag++;

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