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
https://jenkins.io/security/advisory/2017-11-08/
http://www.securityfocus.com/bid/101773
Related Vulnerabilities
CVE-2018-1000104 Vulnerability in maven package org.jenkins-ci.plugins:coverity
CVE-2020-17510 Vulnerability in maven package org.apache.shiro:shiro-spring-boot-web-starter
CVE-2015-5318 Vulnerability in maven package org.jenkins-ci.main:jenkins-core
CVE-2020-1718 Vulnerability in maven package org.keycloak:keycloak-parent