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Vulnerability Details : CVE-2018-20843

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Publish Date : 2019-06-24 Last Update Date : 2022-04-18
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- CVSS Scores & Vulnerability Types

CVSS Score
7.8
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 611

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2020:3952: expat security update (Moderate) oval:com.redhat.rhsa:def:20203952 unix
RHSA-2020:4484: expat security update (Moderate) oval:com.redhat.rhsa:def:20204484 unix
RHSA-2020:4846: mingw-expat security update (Moderate) oval:com.redhat.rhsa:def:20204846 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2018-20843

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 12.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 14.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 16.04 * * * Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 18.04 * * * Version Details Vulnerabilities
5 OS Canonical Ubuntu Linux 18.10 * * * Version Details Vulnerabilities
6 OS Canonical Ubuntu Linux 19.04 * * * Version Details Vulnerabilities
7 OS Debian Debian Linux 8.0 * * * Version Details Vulnerabilities
8 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
9 OS Fedoraproject Fedora 29 * * * Version Details Vulnerabilities
10 OS Fedoraproject Fedora 30 * * * Version Details Vulnerabilities
11 Application Libexpat Project Libexpat * * * * Version Details Vulnerabilities
12 OS Opensuse Leap 15.0 * * * Version Details Vulnerabilities
13 OS Opensuse Leap 15.1 * * * Version Details Vulnerabilities
14 Application Oracle Hospitality Res 3700 * * * * Version Details Vulnerabilities
15 Application Oracle Http Server 12.1.3.0 * * * Version Details Vulnerabilities
16 Application Oracle Http Server 12.2.1.4.0 * * * Version Details Vulnerabilities
17 Application Oracle Outside In Technology 8.5.4 * * * Version Details Vulnerabilities
18 Application Oracle Outside In Technology 8.5.5 * * * Version Details Vulnerabilities
19 Application Tenable Nessus * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 6
Debian Debian Linux 2
Fedoraproject Fedora 2
Libexpat Project Libexpat 1
Opensuse Leap 2
Oracle Hospitality Res 3700 1
Oracle Http Server 2
Oracle Outside In Technology 2
Tenable Nessus 1

- References For CVE-2018-20843

https://www.tenable.com/security/tns-2021-11 CONFIRM
https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.oracle.com/security-alerts/cpuapr2020.html
N/A N/A
https://www.oracle.com/security-alerts/cpuoct2020.html
https://security.netapp.com/advisory/ntap-20190703-0001/ CONFIRM
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
https://security.gentoo.org/glsa/201911-08
GENTOO GLSA-201911-08
https://support.f5.com/csp/article/K51011533 CONFIRM
https://lists.fedoraproject.org/archives/list/[email protected]/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
FEDORA FEDORA-2019-139fcda84d
https://lists.fedoraproject.org/archives/list/[email protected]/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
FEDORA FEDORA-2019-18868e1715
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
MLIST [debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update
https://www.debian.org/security/2019/dsa-4472
DEBIAN DSA-4472
https://seclists.org/bugtraq/2019/Jun/39
BUGTRAQ 20190628 [SECURITY] [DSA 4472-1] expat security update
https://usn.ubuntu.com/4040-2/
UBUNTU USN-4040-2
https://usn.ubuntu.com/4040-1/
UBUNTU USN-4040-1
https://www.oracle.com/security-alerts/cpuoct2021.html
https://github.com/libexpat/libexpat/pull/262
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
SUSE openSUSE-SU-2019:1777
https://github.com/libexpat/libexpat/issues/186

- Metasploit Modules Related To CVE-2018-20843

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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