mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| sonirico | mcp-shell | affected |
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| Sonirico | Mcp-shell |
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| Source | ID | Title |
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Github GHSA |
GHSA-3x77-wg38-92r3 | mcp-shell has a Secure Mode Allowlist Bypass via Default `/bin/bash` Executable |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.454% probability within 30 days)
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| Metrics |
ssvc
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| First Time appeared |
Sonirico
Sonirico mcp-shell |
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| Vendors & Products |
Sonirico
Sonirico mcp-shell |
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| Description | mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default Docker security.yaml includes /bin/bash in allowed_executables, while security.go validates only the first token and checkBlockedPatternsAndCommands does not reject the shell command-mode flag -c. A caller of the shell_exec MCP tool can provide the command argument `/bin/bash -c <arbitrary-command>`, which passes validation and reaches executor.go, where parseCommand and exec.CommandContext execute the arbitrary command as mcpuser outside the intended allowlist. This issue is fixed in version 0.6.0. | |
| Title | mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable | |
| Weaknesses | CWE-1188 CWE-183 CWE-78 |
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| References |
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| Metrics |
cvssV3_1
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