Vulnerabilities > CVE-2020-6071 - Uncontrolled Recursion vulnerability in multiple products

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
videolabs
debian
CWE-674
nessus
NVD
Published: 2020-03-24
Updated: 2022-06-03

Summary

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.

Vulnerable Configurations

Part Description Count
Application
Videolabs
1
OS
Debian
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • XML Nested Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By nesting XML data and causing this data to be continuously self-referential, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization. An attacker's goal is to leverage parser failure to his or her advantage. In most cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it may be possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.230.1].
  • XML Oversized Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By supplying oversized payloads in input vectors that will be processed by the XML parser, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization, and potentially cause execution of arbitrary code. An attacker's goal is to leverage parser failure to his or her advantage. In many cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it is possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.231.1].
  • Violating Implicit Assumptions Regarding XML Content (aka XML Denial of Service (XDoS))
    XML Denial of Service (XDoS) can be applied to any technology that utilizes XML data. This is, of course, most distributed systems technology including Java, .Net, databases, and so on. XDoS is most closely associated with web services, SOAP, and Rest, because remote service requesters can post malicious XML payloads to the service provider designed to exhaust the service provider's memory, CPU, and/or disk space. The main weakness in XDoS is that the service provider generally must inspect, parse, and validate the XML messages to determine routing, workflow, security considerations, and so on. It is exactly these inspection, parsing, and validation routines that XDoS targets. There are three primary attack vectors that XDoS can navigate Target CPU through recursion: attacker creates a recursive payload and sends to service provider Target memory through jumbo payloads: service provider uses DOM to parse XML. DOM creates in memory representation of XML document, but when document is very large (for example, north of 1 Gb) service provider host may exhaust memory trying to build memory objects. XML Ping of death: attack service provider with numerous small files that clog the system. All of the above attacks exploit the loosely coupled nature of web services, where the service provider has little to no control over the service requester and any messages the service requester sends.
  • XML Parser Attack
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.99.1]

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4671.NASL
    descriptionMultiple security issues were discovered in the microdns plugin of the VLC media player, which could result in denial of service or potentially the execution of arbitrary code via malicious mDNS packets.
    last seen2020-05-09
    modified2020-05-04
    plugin id136291
    published2020-05-04
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136291
    titleDebian DSA-4671-1 : vlc - security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4671. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(136291);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/08");

  script_cve_id("CVE-2020-6071", "CVE-2020-6072", "CVE-2020-6073", "CVE-2020-6077", "CVE-2020-6078", "CVE-2020-6079", "CVE-2020-6080");
  script_xref(name:"DSA", value:"4671");
  script_xref(name:"IAVB", value:"2020-B-0025");

  script_name(english:"Debian DSA-4671-1 : vlc - 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:
"Multiple security issues were discovered in the microdns plugin of the
VLC media player, which could result in denial of service or
potentially the execution of arbitrary code via malicious mDNS
packets."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/vlc"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/vlc"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/buster/vlc"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2020/dsa-4671"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the vlc packages.

For the oldstable distribution (stretch), these problems have been
fixed in version 3.0.10-0+deb9u1. This update disables the microdns
plugin.

For the stable distribution (buster), these problems have been fixed
in version 3.0.10-0+deb10u1. This update disables the microdns plugin."
  );
  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:"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:vlc");
  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:"2020/03/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/04");
  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:"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:"libvlc-bin", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libvlc-dev", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libvlc5", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libvlccore-dev", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libvlccore9", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-bin", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-data", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-l10n", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-access-extra", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-base", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-fluidsynth", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-jack", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-notify", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-qt", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-samba", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-skins2", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-svg", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-video-output", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-video-splitter", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-visualization", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"vlc-plugin-zvbi", reference:"3.0.10-0+deb10u1")) flag++;
if (deb_check(release:"9.0", prefix:"libvlc-bin", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libvlc-dev", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libvlc5", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libvlccore-dev", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libvlccore8", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-bin", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-data", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-l10n", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-nox", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-access-extra", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-base", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-fluidsynth", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-jack", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-notify", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-qt", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-samba", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-sdl", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-skins2", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-svg", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-video-output", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-video-splitter", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-visualization", reference:"3.0.10-0+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"vlc-plugin-zvbi", reference:"3.0.10-0+deb9u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-202005-10.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-202005-10 (libmicrodns: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in libmicrodns. Please review the CVE identifiers and the upstream advisory referenced below for details. Impact : Please review the referenced CVE identifiers for details. Workaround : There is no known workaround at this time.
    last seen2020-05-21
    modified2020-05-15
    plugin id136640
    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/136640
    titleGLSA-202005-10 : libmicrodns: Multiple vulnerabilities
  • NASL familyWindows
    NASL idVLC_3_0_9.NASL
    descriptionThe 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
    last seen2020-05-15
    modified2020-05-08
    plugin id136422
    published2020-05-08
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136422
    titleVLC < 3.0.9 Multiple Vulnerabilities

Talos

idTALOS-2020-0994
last seen2020-03-28
published2020-03-23
reporterTalos Intelligence
sourcehttp://www.talosintelligence.com/vulnerability_reports/TALOS-2020-0994
titleVideolabs libmicrodns 0.1.0 resource record recursive label uncompression denial-of-service vulnerability

References