id: GO-2024-2961
modules:
    - module: golang.org/x/crypto
      versions:
        - fixed: 0.0.0-20220525230936-793ad666bf5e
      vulnerable_at: 0.0.0-20220518034528-6f7dac969898
      packages:
        - package: golang.org/x/crypto/acme/autocert
          goos:
            - windows
          symbols:
            - DirCache.Get
            - DirCache.Put
            - DirCache.Delete
          derived_symbols:
            - HostWhitelist
            - Manager.GetCertificate
            - Manager.Listener
            - NewListener
            - listener.Accept
            - listener.Close
summary: Limited directory traversal vulnerability on Windows in golang.org/x/crypto
description: |-
    httpTokenCacheKey uses path.Base to extract the expected HTTP-01 token value to
    lookup in the DirCache implementation. On Windows, path.Base acts differently to
    filepath.Base, since Windows uses a different path separator (\ vs. /), allowing
    a user to provide a relative path, i.e. .well-known/acme-challenge/..\..\asd
    becomes ..\..\asd. The extracted path is then suffixed with +http-01, joined
    with the cache directory, and opened.

    Since the controlled path is suffixed with +http-01 before opening, the impact
    of this is significantly limited, since it only allows reading arbitrary files
    on the system if and only if they have this suffix.
credits:
    - Juho Nurminen of Mattermost
references:
    - fix: https://go.dev/cl/408694
    - report: https://go.dev/issue/53082
cve_metadata:
    id: CVE-2022-30636
    cwe: 'CWE 22: Improper Limitation of a Pathname to a Restricted Directory (''Path Traversal'')'
source:
    id: go-security-team
    created: 2024-07-02T12:55:35.249465-04:00
review_status: REVIEWED