Description
Jenkins versions 2.88 and earlier and 2.73.2 and earlier stores metadata related to 'people', which encompasses actual user accounts, as well as users appearing in SCM, in directories corresponding to the user ID on disk. These directories used the user ID for their name without additional escaping, potentially resulting in problems like overwriting of unrelated configuration files.
Remediation
References
http://www.securityfocus.com/bid/101773
https://jenkins.io/security/advisory/2017-11-08/
Related Vulnerabilities
CVE-2020-13935 Vulnerability in maven package org.apache.tomcat:tomcat-coyote
CVE-2020-7626 Vulnerability in npm package karma-mojo
CVE-2020-13936 Vulnerability in maven package org.apache.velocity:velocity-engine-core
CVE-2021-21321 Vulnerability in npm package fastify-reply-from
CVE-2020-2138 Vulnerability in maven package org.jenkins-ci.plugins:cobertura