turso-cli persists Turso platform JWT with world-readable (0o644) file permissions

### Summary `turso-cli` persists the user's Turso platform JWT to `settings.json` using Viper's default `configPermissions` of `0o644`, leaving the credential file world-readable on standard Linux and macOS systems. Any other local UID on the host can read the file and recover the platform JWT, which grants full Turso platform access scoped to the user's organizations. ### Impact The token in `settings.json` grants the holder full Turso platform access — create or destroy databases, rotate credentials, exfiltrate data, change billing settings — for any organization the user belongs to. Because the file is world-readable, the credential is reachable by: - Cron jobs or daemons running as a different system user on the same host - Sandboxed CI runners with a mounted home directory - Containers with a bind-mounted host home - Co-tenants on a shared multi-user developer or jumpbox host The file path resolves through `configdir.LocalConfig("turso")`: - macOS: `~/Library/Application Support/turso/settings.json` - Linux: `~/.config/turso/settings.json` (or `$XDG_CONFIG_HOME/turso/settings.json`) It contains the platform JWT in plaintext JSON alongside `organization` and `username` fields. Comparable CLIs (`gh`, `aws`, `docker`, `gcloud`, plus close peers `planetscale`, `neon`, `upstash`) write credential files at `0o600` explicitly, so this is a deviation from the cross-vendor baseline rather than a deliberate trade-off. ### Details The OAuth callback handler stores the platform JWT via the settings layer: ```go // internal/cmd/auth.go:205-214 jwt, err := callbackServer.Result() ... settings.SetToken(jwt) ``` `SetToken` writes through Viper: ```go // internal/settings/settings.go:124-127 func (s *Settings) SetToken(token string) { viper.Set("token", token) s.changed = true } ``` Persistence runs through `viper.WriteConfig`: ```go // internal/settings/settings.go:96-101 func TryToPersistChanges() error { if err := viper.WriteConfig(); err != nil { return fmt.Errorf("failed to persist turso settings file: %w", err) } return nil } ``` Viper v1.21.0 (pinned in `turso-cli` `go.mod`) initializes `configPermissions` to `os.FileMode(0o644)` at `viper.go:198` and passes that mode straight to `os.OpenFile` at `viper.go:1688`. Without a call to `viper.SetConfigPermissions(0o600)`, the resulting `settings.json` is created at `0o644`. A `grep` over the auth-config write path under `internal/` returns zero hits for `Chmod`, `0o600`, or `0600`, confirming there is no follow-up tightening of the file mode anywhere on the persistence path. ### Proof of concept Minimal reproducer using the same Viper version `turso-cli` pins (`github.com/spf13/viper v1.21.0`): ```go package main import ( "fmt" "os" "path/filepath" "github.com/spf13/viper" ) func main() { dir, _ := os.MkdirTemp("", "viperpoc-*") defer os.RemoveAll(dir) viper.SetConfigName("settings") viper.SetConfigType("json") viper.AddConfigPath(dir) viper.Set("token", "FAKE_TURSO_JWT_xxxxxxxxxxxxxxxxxxxx") viper.Set("organization", "exampleorg") viper.SafeWriteConfig() st, _ := os.Stat(filepath.Join(dir, "settings.json")) fmt.Printf("mode: %o\n", st.Mode()&0o777) } ``` $ go run main.go mode: 644 The same `SafeWriteConfig` / `WriteConfig` calls `turso-cli` uses produce the same `0o644` mode in a real `turso auth login` flow. ### Remediation One-line fix at the existing Viper configuration site in `internal/settings/settings.go` (around lines 48-50): ```go viper.SetConfigName("settings") viper.SetConfigType("json") viper.AddConfigPath(configPath) viper.SetConfigPermissions(0o600) // restrict settings.json to owner only ``` Defense in depth: - Add `os.Chmod(configFile, 0o600)` after `TryToPersistChanges`, or on read (as PlanetScale does in `internal/config/config.go` — they `Stat` the token file and self-heal if `Mode() &^ 0o600` is nonzero). `viper.SetConfigPermissions` applies only on file creation, so an existing wider-mode file is not tightened otherwise. - Add `os.Chmod(configPath, 0o700)` after `configdir.MakePath(configPath)` (line 43) to close the equivalent gap on the enclosing directory, which is otherwise created under the default umask. Patch: https://github.com/tursodatabase/turso-cli/commit/ffb914849216ef5a86353b3fa6cee66f33af3b66 ### Workarounds Until upgraded, users can tighten the existing files manually: ```sh # Linux chmod 600 ~/.config/turso/settings.json chmod 700 ~/.config/turso # macOS chmod 600 "$HOME/Library/Application Support/turso/settings.json" chmod 700 "$HOME/Library/Application Support/turso" ``` This must be repeated after any operation that recreates the file (e.g. `turso auth login`) until the patched version is installed. ### Resources - Patch commit: https://github.com/tursodatabase/turso-cli/commit/ffb914849216ef5a86353b3fa6cee66f33af3b66 - Viper `configPermissions` default: https://github.com/spf13/viper/blob/v1.21.0/viper.go#L198 - Viper write path: https://github.com/spf13/viper/blob/v1.21.0/viper.go#L1688 - CWE-276: https://cwe.mitre.org/data/definitions/276.html - CWE-732: https://cwe.mitre.org/data/definitions/732.html

Source published

26 Jun 2026 20:44:39 UTC

Source modified

7 Jul 2026 16:11:34 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Publisher rating · MODERATE