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

047910
CVSS 5.5 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
local
low complexity
debian
fedoraproject
canonical
CWE-125
nessus
NVD
Published: 2020-05-15
Updated: 2024-11-21

Summary

Missing input validation in the ar/tar implementations of APT before version 2.1.2 could result in denial of service when processing specially crafted deb files.

Vulnerable Configurations

Part Description Count
OS
Debian
2
OS
Fedoraproject
1
OS
Canonical
6
Application
Debian
270

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Overread Buffers
    An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4685.NASL
    descriptionShuaibing 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.
    last seen2020-05-22
    modified2020-05-14
    plugin id136591
    published2020-05-14
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136591
    titleDebian DSA-4685-1 : apt - security update
    code
    #
# (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");
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-4359-1.NASL
    descriptionIt 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.
    last seen2020-05-22
    modified2020-05-14
    plugin id136608
    published2020-05-14
    reporterUbuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136608
    titleUbuntu 16.04 LTS / 18.04 LTS / 19.10 / 20.04 : apt vulnerability (USN-4359-1)
    code
    #
# (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");
}
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-2210.NASL
    descriptionWhen normalizing ar member names by removing trailing whitespace and slashes, an out-out-bound read can be caused if the ar member name consists only of such characters, because the code did not stop at 0, but would wrap around and continue reading from the stack, without any limit. For Debian 8
    last seen2020-05-22
    modified2020-05-15
    plugin id136631
    published2020-05-15
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136631
    titleDebian DLA-2210-1 : apt security update

References