#VU18923 XML External Entity injection in expat - CVE-2018-20843

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Main Vulnerability Database Vulnerabilities #VU18923

#VU18923 XML External Entity injection in expat - CVE-2018-20843

Published: June 27, 2019 / Updated: June 20, 2021


Vulnerability identifier: #VU18923
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2018-20843
CWE-ID: CWE-611
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vulnerable software:
expat
Software vendor:
libexpat.org

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input including XML names that contain a large number of colons. A remote attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.


Remediation

Install updates from vendor's website.

External links