GHSA-3whc-qvhv-xqjp

Опубликовано: 01 июл. 2026

Источник: github

Github: Прошло ревью

CVSS3: 8.1

Описание

goshs: WebDAV listener ignores --read-only, --upload-only, and --no-delete mode flags

WebDAV listener ignores `--read-only`, `--upload-only`, and `--no-delete` mode flags

Ecosystem: Go Package: goshs.de/goshs/v2 (github.com/patrickhener/goshs) Affected: <= v2.0.9 (every release that ships the WebDAV handler)

Summary

When goshs is launched with WebDAV enabled (-w), the mode-restriction flags --read-only, --upload-only, and --no-delete are enforced only on the primary HTTP port. The WebDAV port is wired straight to golang.org/x/net/webdav.Handler with no equivalent guard, so an authenticated WebDAV client can PUT, DELETE, MKCOL, MOVE, and COPY despite the operator's stated intent.

Details

httpserver/server.go:207-238 — the WebDAV mux registers only IPWhitelistMiddleware, ServerHeaderMiddleware, and optionally BasicAuthMiddleware. There is no fs.ReadOnly || fs.UploadOnly || fs.NoDelete check on the WebDAV path. The HTTP mux in the same file (lines 134-204) does check these flags on every state-changing route.

Proof of concept

mkdir -p /tmp/r && echo secret > /tmp/r/x.txt goshs -p 18000 -wp 18001 -w -ro -d /tmp/r -b admin:pw & curl -u admin:pw -X PUT http://localhost:18000/y.txt --data x # 403 (HTTP enforces -ro) curl -u admin:pw -X PUT http://localhost:18001/y.txt --data x # 201 (WebDAV writes anyway) curl -u admin:pw -X DELETE http://localhost:18001/x.txt # 204 (WebDAV deletes anyway) curl -u admin:pw -X MKCOL http://localhost:18001/pwned/ # 201 (WebDAV creates dir)

Impact

Integrity — --read-only and --no-delete are silently downgraded to "no protection" on the WebDAV port. Any WebDAV client (curl, cadaver, Windows Explorer, Finder) can overwrite/delete files.
Confidentiality — --upload-only is also bypassed: WebDAV GET/PROPFIND still return file contents.
Trust — operators using goshs -w -ro -d /srv/case-files -b reviewer:pw to deliver engagement artifacts believe the directory is immutable. It isn't.

Suggested fix

Add a small http.HandlerFunc in front of wdHandler that maps WebDAV verbs to the existing mode flags:

wdGuard := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { switch r.Method { case http.MethodPut, "MKCOL", "MOVE", "COPY": if fs.ReadOnly || fs.UploadOnly { http.Error(w, "read-only", 403); return } case http.MethodDelete: if fs.ReadOnly || fs.UploadOnly || fs.NoDelete { http.Error(w, "delete disabled", 403); return } case http.MethodGet, "PROPFIND", "HEAD": if fs.UploadOnly { http.Error(w, "upload-only", 403); return } } wdHandler.ServeHTTP(w, r) })

Add regression tests in integration/functions.go covering each mode flag × each WebDAV verb.

Reporter: Nishant Verma. Reproduced live against goshs v2.0.9 (commit 8fc1e91) on 2026-05-27.

Ссылки

https://github.com/patrickhener/goshs/security/advisories/GHSA-3whc-qvhv-xqjp

Пакеты

Наименование

goshs.de/goshs/v2

Затронутые версииВерсия исправления

<= 2.0.9

2.1.0

EPSS

Процентиль: 26%

0.00334

Низкий

8.1 High

CVSS3

CVE ID

CVE-2026-50138

Дефекты

CWE-284

Связанные уязвимости

CVE-2026-50138

CVSS3: 8.1

nvd

15 дней назад

goshs is a SimpleHTTPServer written in Go. Prior to version 2.1.0, when `goshs` is launched with WebDAV enabled (`-w`), the mode-restriction flags `--read-only`, `--upload-only`, and `--no-delete` are enforced only on the primary HTTP port. The WebDAV port is wired straight to `golang.org/x/net/webdav.Handler` with no equivalent guard, so an authenticated WebDAV client can `PUT`, `DELETE`, `MKCOL`, `MOVE`, and `COPY` despite the operator's stated intent. Version 2.1.0 patches the issue.

EPSS

Процентиль: 26%

0.00334

Низкий

8.1 High

CVSS3

CVE ID

CVE-2026-50138

Дефекты

CWE-284