漏洞信息
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Vulnerability Title
fast-mcp-telegram: Bearer token path traversal bypasses reserved Telegram session protection
Vulnerability Description
fast-mcp-telegram is a Telegram MCP Server. Prior to 0.19.1, fast-mcp-telegram validates HTTP Bearer tokens by joining the raw token string into a session-file path. The verifier rejects the exact reserved token telegram, but it does not reject path separators or normalize the path before checking whether the session file exists. A remote HTTP client can therefore authenticate as the default legacy session with a token such as ../fast-mcp-telegram/telegram when the documented default session file ~/.config/fast-mcp-telegram/telegram.session exists. This bypasses the reserved session name control that is intended to prevent HTTP multi-user sessions from colliding with the default stdio or legacy account. With account-prefixed MCP tools enabled, the attacker still sees and calls the prefixed tools for the default account, so the prefix middleware does not stop the session selection bypass. This vulnerability is fixed in 0.19.1.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Vulnerability Title
leshchenko1979 fast-mcp-telegram 路径遍历漏洞
Vulnerability Description
leshchenko1979 fast-mcp-telegram是leshchenko1979个人开发者的一个Telegram消息代理组件。 leshchenko1979 fast-mcp-telegram 0.19.1之前版本存在安全漏洞,该漏洞源于验证HTTP Bearer令牌时未拒绝路径分隔符或规范化路径,可能导致远程HTTP客户端使用特制令牌绕过保留会话名称控制,以默认旧会话身份进行身份验证。
CVSS Information
N/A
Vulnerability Type
N/A