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CVE-2021-48013 – Unauthenticated Path Traversal / Arbitrary File Read – Weaver E-cology 8.0

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Summary

CVE-2021-48013 is an unauthenticated path traversal vulnerability (CWE-22) in Weaver E-cology 8.0. A remote attacker can read arbitrary files from the server without authentication. The CVE record rates it 8.7 (High) under CVSS v4.0.

Technical details

  • Root cause: The /weaver/ln.FileDownload endpoint does not properly restrict the fpath parameter, so directory traversal sequences are accepted.
  • Trigger conditions: The attacker sends a request to /weaver/ln.FileDownload with a crafted fpath value. No authentication or user interaction is needed.
  • Attack vector: Network.
  • Impact: Disclosure of sensitive files, for example WEB-INF/web.xml. The vector shows high confidentiality impact and no integrity or availability impact.
  • Exploitation: The CVE record cites first exploitation observed on October 18, 2023 (Shadowserver Foundation).

Affected software

  • Weaver E-cology 8.0

Severity

  • CVSS v4.0: 8.7 (High), CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1: 7.5 (High), CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: The CVE record does not name a fixed version. Check with Weaver for a patched E-cology release and upgrade as soon as one is available.
  • Until a fix is applied, restrict access to the /weaver/ln.FileDownload endpoint, for example with a WAF rule or reverse-proxy block. Do not expose E-cology directly to the internet.
  • Review web server logs for requests to /weaver/ln.FileDownload containing traversal sequences in fpath.
  • If exploitation is suspected, rotate any credentials or secrets stored in files readable by the application.

References

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