Apache HTTP server v2.4.0 to v2.4.39 - Open Redirect

mediumseverity

6.1CVSS score

74%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the request URL.

Impact

An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the download of malware.

Fix

Upgrade Apache HTTP server to version 2.4.40 or later to mitigate this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/http%3A%2F%2Fwww.interact.sh
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)?(?:[a-zA-Z0-9\-_\.@]…/

Run it with nuclei: nuclei -id CVE-2019-10098 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-10098

info:
  name: Apache HTTP server v2.4.0 to v2.4.39 - Open Redirect
  author: ctflearner
  severity: medium
  description: |
    In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the request URL.
  impact: |
    An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the download of malware.
  remediation: |
    Upgrade Apache HTTP server to version 2.4.40 or later to mitigate this vulnerability.
  reference:
    - https://www.exploit-db.com/exploits/47689
    - https://nvd.nist.gov/vuln/detail/CVE-2019-10098
    - https://www.openwall.com/lists/oss-security/2020/04/01/4
    - https://httpd.apache.org/security/vulnerabilities_24.html
    - https://www.oracle.com/security-alerts/cpuapr2021.html
    - https://www.oracle.com/security-alerts/cpuoct2019.html
  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-2019-10098
    cwe-id: CWE-601
    epss-score: 0.73981
    epss-percentile: 0.99484
    cpe: cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: http_server
    shodan-query:
      - cpe:"cpe:2.3:a:apache:http_server"
      - apache 2.4.49
  tags: cve,cve2019,redirect,apache,server,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/http%3A%2F%2Fwww.interact.sh"

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$'

References

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