Debian DLA-1676-1 : unbound 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-1676-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(122196);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/20");

  script_cve_id("CVE-2017-15105");

  script_name(english:"Debian DLA-1676-1 : unbound security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Ralph Dolmans and Karst Koymans found a flaw in the way unbound, a
validating, recursive, caching DNS resolver, validated
wildcard-synthesized NSEC records.

An improperly validated wildcard NSEC record could be used to prove
the non-existence (NXDOMAIN answer) of an existing wildcard record, or
trick unbound into accepting a NODATA proof.

For more information please refer to the upstream advisory at
https://unbound.net/downloads/CVE-2017-15105.txt.

For Debian 8 'Jessie', this problem has been fixed in version
1.4.22-3+deb8u4.

We recommend that you upgrade your unbound 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/2019/02/msg00022.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/jessie/unbound");
  script_set_attribute(attribute:"see_also", value:"https://nlnetlabs.nl/downloads/unbound/CVE-2017-15105.txt");
  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:P/A:N");
  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:N/UI:N/S:U/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-15105");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-anchor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-host");
  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) 2019-2024 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:"libunbound-dev", reference:"1.4.22-3+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"libunbound2", reference:"1.4.22-3+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"python-unbound", reference:"1.4.22-3+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"unbound", reference:"1.4.22-3+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"unbound-anchor", reference:"1.4.22-3+deb8u4")) flag++;
if (deb_check(release:"8.0", prefix:"unbound-host", reference:"1.4.22-3+deb8u4")) 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");