Auth bypass in Atlassian Jira Core Data Center
CVE-2020-36239
Jira Data Center, Jira Core Data Center, Jira Software Data Center from version 6.3.0 before 8.5.16, from 8.6.0 before 8.13.8, from 8.14.0 before 8.17.0 and Jira Service Management Data Center from version 2.0.2 before 4.5.16, from version 4.6.0 before 4.13.8, and from version 4.14.0 before 4.17.0 exposed a Ehcache RMI network service which attackers, who can connect to the service, on port 40001 and potentially 40011[0][1], could execute arbitrary code of their choice in Jira through deserialization due to a missing authentication vulnerability. While Atlassian strongly suggests restricting access to the Ehcache ports to only Data Center instances, fixed versions of Jira will now require a shared secret in order to allow access to the Ehcache service. [0] In Jira Data Center, Jira Core Data Center, and Jira Software Data Center versions prior to 7.13.1, the Ehcache object port can be randomly allocated. [1] In Jira Service Management Data Center versions prior to 3.16.1, the Ehcache object port can be randomly allocated.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.498 (98.9th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.498 · newest: 0.498 · change: 0.000
Affected products
- Atlassian Jira Core Data Center — versions 6.3.0, unspecified, 8.6.0
- Atlassian Jira Data Center — versions 6.3.0, unspecified, 8.6.0
- Atlassian Jira Data Center
- Atlassian Jira Service Desk
- Atlassian Jira Service Management
- Atlassian Jira Service Management Data Center — versions 2.0.2, unspecified, 4.6.0
- Atlassian Jira Software Data Center — versions 6.3.0, unspecified, 8.6.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- jira.atlassian.com/browse/JSDSERVER-8454 (Issue Tracking, Vendor Advisory)
- jira.atlassian.com/browse/JRASERVER-72566 (Issue Tracking, Vendor Advisory)
- confluence.atlassian.com/adminjiraserver/jira-data-center-and-jira-service-mana… (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-36239?
- CVE-2020-36239 is a critical-severity vulnerability in Atlassian Jira Core Data Center, classified under Missing Authorization. CVSS score: 9.8/10. Published 2021-07-29.
- How severe is CVE-2020-36239?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-36239 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.