mcp-shell: Secure Mode Allowlist Bypass via Git Shell Alias
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| sonirico | mcp-shell | affected |
|
No data.
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sonirico | Mcp-shell |
|
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-74hp-mggr-hv58 | mcp-shell has a Secure Mode Allowlist Bypass via Git Shell Alias |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.267% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Sonirico
Sonirico mcp-shell |
|
| Vendors & Products |
Sonirico
Sonirico mcp-shell |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | mcp-shell: Secure Mode Allowlist Bypass via Git Shell Alias | |
| Weaknesses | CWE-78 | |
| References |
| |
| Metrics |
cvssV3_1
|