Vulnerabilities > CVE-2019-19721 - Off-by-one Error vulnerability in Videolan VLC Media Player

#
# (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(136159);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/08");

  script_xref(name:"IAVB", value:"2020-B-0025");

  script_name(english:"FreeBSD : vlc -- Multiple vulnerabilities fixed in VLC media player (4a10902f-8a48-11ea-8668-e0d55e2a8bf9)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"VideoLAN reports : Details A remote user could :

- Create a specifically crafted image file that could trigger an out
of bounds read 

- Send a specifically crafter request to the microdns service
discovery, potentially triggering various memory management issues
Impact

If successful, a malicious third party could trigger either a crash of
VLC or an arbitratry code execution with the privileges of the target
user.

While these issues in themselves are most likely to just crash the
player, we can't exclude that they could be combined to leak user
informations or remotely execute code. ASLR and DEP help reduce the
likelyness of code execution, but may be bypassed.

We have not seen exploits performing code execution through these
vulnerabilities

CVE-2019-19721 affects VLC 3.0.8 and earlier, and only reads 1 byte
out of bound"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.videolan.org/security/sb-vlc309.html"
  );
  # https://vuxml.freebsd.org/freebsd/4a10902f-8a48-11ea-8668-e0d55e2a8bf9.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?20cae9ca"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_attribute(attribute:"risk_factor", value:"High");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/30");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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:"vlc<3.0.10,4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
  else security_hole(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 Gentoo Linux Security Advisory GLSA 202005-11.
#
# The advisory text is Copyright (C) 2001-2020 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(136641);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");

  script_cve_id("CVE-2019-19721");
  script_xref(name:"GLSA", value:"202005-11");
  script_xref(name:"IAVB", value:"2020-B-0025");

  script_name(english:"GLSA-202005-11 : VLC: Buffer overflow");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The remote host is affected by the vulnerability described in GLSA-202005-11
(VLC: Buffer overflow)

    A buffer overflow in DecodeBlock in sdl_image.c was discovered.
  
Impact :

    A remote user could craft a specifically crafted image file that could
      execute arbitrary code or cause denial of service.
  
Workaround :

    The user should refrain from opening files from untrusted third parties
      or accessing untrusted remote sites (or disable the VLC browser plugins),
      until they upgrade."
  );
  # https://git.videolan.org/?p=vlc/vlc-3.0.git;a=commit;h=72afe7ebd8305bf4f5360293b8621cde52ec506b
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?64105146"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.videolan.org/security/sb-vlc309.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/202005-11"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"All VLC users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=media-video/vlc-3.0.10'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:L/AC:L/PR:N/UI:R/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:"cvss_score_source", value:"CVE-2019-19721");
  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:gentoo:linux:vlc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  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:"2020/05/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"media-video/vlc", unaffected:make_list("ge 3.0.10"), vulnerable:make_list("lt 3.0.10"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "VLC");
}

#
# (C) Tenable Network Security, Inc.
#

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(136422);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/13");

  script_cve_id(
    "CVE-2019-19721",
    "CVE-2020-6071",
    "CVE-2020-6072",
    "CVE-2020-6073",
    "CVE-2020-6077",
    "CVE-2020-6078",
    "CVE-2020-6079"
  );
  script_xref(name:"IAVB", value:"2020-B-0025");

  script_name(english:"VLC < 3.0.9 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host contains a media player that is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of VLC media player installed on the remote Windows host is prior to 3.0.9. It is, therefore, affected by 
multiple vulnerabilities:

  - An exploitable denial-of-service vulnerability exists in the resource record-parsing functionality of Videolabs 
    libmicrodns 0.1.0. When parsing compressed labels in mDNS messages, the compression pointer is followed without checking 
    for recursion, leading to a denial of service. An attacker can send an mDNS message to trigger this vulnerability 
    (CVE-2020-6071).     

  - An exploitable code execution vulnerability exists in the label-parsing functionality of Videolabs libmicrodns 0.1.0. 
    When parsing compressed labels in mDNS messages, the rr_decode function's return value is not checked, leading to a 
    double free that could be exploited to execute arbitrary code. An attacker can send an mDNS message to trigger this 
    vulnerability (CVE-2020-6072).

  - An exploitable denial-of-service vulnerability exists in the TXT record-parsing functionality of Videolabs libmicrodns 0.1.0. 
    When parsing the RDATA section in a TXT record in mDNS messages, multiple integer overflows can be triggered, leading to a denial 
    of service. An attacker can send an mDNS message to trigger this vulnerability (CVE-2020-6073).

  - An exploitable denial-of-service vulnerability exists in the message-parsing functionality of Videolabs libmicrodns 0.1.0. 
    When parsing mDNS messages, the implementation does not properly keep track of the available data in the message, possibly leading 
    to an out-of-bounds read that would result in a denial of service. An attacker can send an mDNS message to trigger this 
    vulnerability (CVE-2020-6077).

  - An exploitable denial-of-service vulnerability exists in the message-parsing functionality of Videolabs libmicrodns 0.1.0. 
    When parsing mDNS messages in mdns_recv, the return value of the mdns_read_header function is not checked, leading to an uninitialized 
    variable usage that eventually results in a null pointer dereference, leading to service crash. An attacker can send a series of 
    mDNS messages to trigger this vulnerability (CVE-2020-6078).

  - An exploitable denial-of-service vulnerability exists in the resource allocation handling of Videolabs libmicrodns 0.1.0. 
    When encountering errors while parsing mDNS messages, some allocated data is not freed, possibly leading to a denial-of-service 
    condition via resource exhaustion. An attacker can send one mDNS message repeatedly to trigger this vulnerability through decoding 
    of the domain name performed by rr_decode (CVE-2020-6079).");
  script_set_attribute(attribute:"see_also", value:"https://www.videolan.org/security/sb-vlc309.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to VLC version 3.0.9 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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:"cvss_score_source", value:"CVE-2020-6072");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:videolan:vlc_media_player");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

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

  script_dependencies("vlc_installed.nasl");
  script_require_keys("SMB/VLC/Version");

  exit(0);
}

include('vcf.inc');

app_info = vcf::get_app_info(app:'VLC media player', win_local:TRUE);

constraints = [{'fixed_version':'3.0.9'}];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);