Vulnerabilities > CVE-2020-3810 - Out-of-bounds Read vulnerability in multiple products

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4685. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(136591);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/21");

  script_cve_id("CVE-2020-3810");
  script_xref(name:"DSA", value:"4685");

  script_name(english:"Debian DSA-4685-1 : apt - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Shuaibing Lu discovered that missing input validation in the ar/tar
implementations of APT, the high level package manager, could result
in denial of service when processing specially crafted deb files."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/apt"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/apt"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/buster/apt"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2020/dsa-4685"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the apt packages.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.4.10.

For the stable distribution (buster), this problem has been fixed in
version 1.8.2.1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3810");
  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:debian:debian_linux:apt");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/14");
  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:"Debian Local Security Checks");

  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:"10.0", prefix:"apt", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"apt-doc", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"apt-transport-https", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"apt-utils", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"libapt-inst2.0", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"libapt-pkg-dev", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"libapt-pkg-doc", reference:"1.8.2.1")) flag++;
if (deb_check(release:"10.0", prefix:"libapt-pkg5.0", reference:"1.8.2.1")) flag++;
if (deb_check(release:"9.0", prefix:"apt", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"apt-doc", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"apt-transport-https", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"apt-utils", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"libapt-inst2.0", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"libapt-pkg-dev", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"libapt-pkg-doc", reference:"1.4.10")) flag++;
if (deb_check(release:"9.0", prefix:"libapt-pkg5.0", reference:"1.4.10")) 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");

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4359-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(136608);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/21");

  script_cve_id("CVE-2020-3810");
  script_xref(name:"USN", value:"4359-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 19.10 / 20.04 : apt vulnerability (USN-4359-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description",
    value:
"It was discovered that APT incorrectly handled certain filenames
during package installation. If an attacker could provide a specially
crafted package to be installed by the system administrator, this
could cause APT to crash.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu 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://usn.ubuntu.com/4359-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected apt package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3810");
  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:canonical:ubuntu_linux:apt");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/14");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(16\.04|18\.04|19\.10|20\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 16.04 / 18.04 / 19.10 / 20.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"16.04", pkgname:"apt", pkgver:"1.2.32ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"apt", pkgver:"1.6.12ubuntu0.1")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"apt", pkgver:"1.9.4ubuntu0.1")) flag++;
if (ubuntu_check(osver:"20.04", pkgname:"apt", pkgver:"2.0.2ubuntu0.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "apt");
}