漏洞信息
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Vulnerability Title
QWED-MCP: Unsafe SymPy `parse_expr()` Remote Code Execution via Unsanitized Math Expression Input
Vulnerability Description
QWED-MCP is a deterministic verification gateway for MCP. Prior to 0.2.1, verify_math_expression() in src/qwed_mcp/engines/math_engine.py passes attacker-controlled expression and claimed_result strings directly to SymPy's parse_expr() after only normalizing caret syntax to Python exponent syntax, without restricting global_dict, removing Python built-ins, or validating the expression AST. Because parse_expr() calls Python's eval() with built-ins available, an attacker who can cause a downstream caller to pass untrusted input to this public library function can use Python import functionality to execute arbitrary operating-system commands as the qwed-mcp process user, read or modify accessible data, exfiltrate process secrets, or reach internal services. The default MCP tool registry does not expose verify_math_expression(), so exploitation requires a downstream integration that invokes the library API with attacker-controlled input. This issue is fixed in version 0.2.1.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Vulnerability Title
QWED-MCP 代码注入漏洞
Vulnerability Description
QWED-MCP是QWED组织的一款机器学习模型上下文协议工具。 QWED-MCP 0.2.1之前版本存在代码注入漏洞,该漏洞源于src/qwed_mcp/engines/math_engine.py文件中的verify_math_expression()函数将攻击者控制的expression和claimed_result参数直接传递给SymPy的parse_expr()处理,且未限制global_dict、移除Python内置函数或验证表达式AST,可能导致攻击者利用Python导入功能执行任意操作系统
CVSS Information
N/A
Vulnerability Type
N/A