Description
fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for denial of service (DoS) attacks. By crafting an entity name that results in an intentionally bad performing regex and utilizing it in the entity replacement step of the parser, this can cause the parser to stall for an indefinite amount of time. This problem has been resolved in v4.2.4. Users are advised to upgrade. Users unable to upgrade should avoid using DOCTYPE parsing by setting the `processEntities: false` option.
Remediation
References
https://github.com/NaturalIntelligence/fast-xml-parser/commit/39b0e050bb909e8499478657f84a3076e39ce76c
https://github.com/NaturalIntelligence/fast-xml-parser/commit/a4bdced80369892ee413bf08e28b78795a2b0d5b
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-6w63-h3fj-q4vw
Related Vulnerabilities
CVE-2020-5245 Vulnerability in maven package io.dropwizard:dropwizard-validation
CVE-2020-11994 Vulnerability in maven package org.apache.camel:camel-robotframework
CVE-2018-20676 Vulnerability in maven package org.webjars.bowergithub.twbs:bootstrap
CVE-2022-29253 Vulnerability in maven package org.xwiki.platform:xwiki-platform-oldcore
CVE-2020-7707 Vulnerability in maven package org.webjars.npm:property-expr