Vulnerabilities > CVE-2020-6071 - Uncontrolled Recursion vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH 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 | 1 | |
| OS | 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 family Debian Local Security Checks NASL id DEBIAN_DSA-4671.NASL description 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. last seen 2020-05-09 modified 2020-05-04 plugin id 136291 published 2020-05-04 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136291 title Debian 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 family Gentoo Local Security Checks NASL id GENTOO_GLSA-202005-10.NASL description The 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 seen 2020-05-21 modified 2020-05-15 plugin id 136640 published 2020-05-15 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136640 title GLSA-202005-10 : libmicrodns: Multiple vulnerabilities NASL family Windows NASL id VLC_3_0_9.NASL description 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 last seen 2020-05-15 modified 2020-05-08 plugin id 136422 published 2020-05-08 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136422 title VLC < 3.0.9 Multiple Vulnerabilities
Talos
| id | TALOS-2020-0994 |
| last seen | 2020-03-28 |
| published | 2020-03-23 |
| reporter | Talos Intelligence |
| source | http://www.talosintelligence.com/vulnerability_reports/TALOS-2020-0994 |
| title | Videolabs libmicrodns 0.1.0 resource record recursive label uncompression denial-of-service vulnerability |
References
- https://security.gentoo.org/glsa/202005-10
- https://security.gentoo.org/glsa/202005-10
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-0994
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-0994
- https://www.debian.org/security/2020/dsa-4671
- https://www.debian.org/security/2020/dsa-4671