جزئیات آسیب‌پذیری

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default security.yaml allows /usr/bin/git, while security.go omits ! from containsShellMetacharacters and containsDangerousShellConstructs and applies no per-executable argument policy. A caller of the shell_exec MCP tool can provide the command argument /usr/bin/git -c alias.pwn=!<arbitrary-command>, causing Git to create a shell alias and execute arbitrary OS commands as the mcp-shell process user. The default Docker image runs as mcpuser with Git installed and secure mode enabled, so the bypass is exploitable in the default deployment without additional authentication beyond MCP connectivity. This issue is fixed in version 0.6.0.

• https://github.com/sonirico/mcp-shell/pull/16 x_refsource_MISC
• https://github.com/sonirico/mcp-shell/commit/f31377fce6ec31114e5a4398c0e5270552bce09f x_refsource_MISC
• https://github.com/sonirico/mcp-shell/releases/tag/v0.6.0 x_refsource_MISC
• https://github.com/sonirico/mcp-shell/security/advisories/GHSA-74hp-mggr-hv58 x_refsource_CONFIRM