Description

mcp-ssh-tool has file transfer path policy bypass and bearer token comparison hardening

Summary

mcp-ssh-tool has released version 2.1.1 with security hardening for transfer path authorization and HTTP bearer authentication.

The release addresses:

insufficient local path policy enforcement in transfer-related filesystem handling

incomplete canonicalization and segment-boundary handling for deny-prefix path policy checks

non-constant-time HTTP bearer token comparison

Impact

Affected versions may allow policy bypass in transfer path handling under specific configurations, and may expose a timing side channel in bearer-token comparison for HTTP deployments.

Patched Version

Upgrade to mcp-ssh-tool >= 2.1.1.

npm install -g mcp-ssh-tool@latest

Workarounds

For deployments that cannot immediately upgrade:

avoid exposing HTTP transport beyond loopback

use strict filesystem policy configuration

avoid granting MCP clients access to sensitive local transfer paths

monitor audit logs for unexpected transfer operations

Credits

Reported by dodge1218.

Mitigation

Aliases

References