CVE-2019-20101: 
JIRA vulnerability analysis and mitigation

Atlassian Jira Server and Data Center were affected by a Broken Access Control vulnerability (CVE-2019-20101) that allowed anonymous remote attackers to view whitelist rules through the /rest/whitelist//check endpoint. The vulnerability affected versions before 8.13.3 and versions from 8.14.0 before 8.14.1 (Jira Advisory).

The vulnerability has been assigned a CVSS v3.1 Base Score of 5.3 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. This indicates that the vulnerability is network-accessible, requires low attack complexity, needs no privileges or user interaction, has unchanged scope, and only impacts confidentiality at a low level (NVD).

The vulnerability allows unauthorized access to whitelist rules, potentially exposing sensitive configuration information. The impact is limited to confidentiality breach with no effect on system integrity or availability (NVD).

The vulnerability is easily exploitable as it requires no authentication, privileges, or user interaction. The attack vector is network-accessible, making it possible for remote attackers to exploit (NVD).

Atlassian has released fixed versions to address this vulnerability. Users should upgrade to version 8.13.3 or later if running version 8.13.x, or to version 8.14.1 or later if running version 8.14.x (Jira Advisory).