Attacker Value
Unknown
(1 user assessed)
Exploitability
Unknown
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
1

CVE-2020-36239

Disclosure Date: July 21, 2021
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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2
Technical Analysis

Atlassian disclosed a remote code execution (RCE) vulnerability affecting multiple versions of Jira Data Center, Jira Core Data Center, Jira Software Data Center and Jira Service Data Center.
Threat actors with access to ports 40001 and 40011 (Ehcache RMI ports) could execute arbitrary code, due to a missing authentication flaw in Jira’s deployment .
https://confluence.atlassian.com/adminjiraserver/jira-data-center-and-jira-service-management-data-center-security-advisory-2021-07-21-1063571388.html#JiraDataCenterAndJiraServiceManagementDataCenterSecurityAdvisory20210721-Mitigation

CVSS V3 Severity and Metrics
Base Score:
9.8 Critical
Impact Score:
5.9
Exploitability Score:
3.9
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Vendors

  • Atlassian

Products

  • Jira Data Center,
  • Jira Core Data Center,
  • Jira Software Data Center,
  • Jira Service Management Data Center

Additional Info

Technical Analysis