167 lines
6.9 KiB
JSON
167 lines
6.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-55581",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-06-16T23:18:03.169Z",
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"datePublished": "2026-08-25T15:40:10.992Z",
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"dateUpdated": "2026-08-25T19:01:56.083Z"
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},
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"containers": {
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"cna": {
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"title": "mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-78",
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"lang": "en",
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"description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-183",
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"lang": "en",
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"description": "CWE-183: Permissive List of Allowed Inputs",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-1188",
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"lang": "en",
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"description": "CWE-1188: Insecure Default Initialization of Resource",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "LOCAL",
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"availabilityImpact": "HIGH",
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"baseScore": 8.4,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/sonirico/mcp-shell/security/advisories/GHSA-3x77-wg38-92r3",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/sonirico/mcp-shell/security/advisories/GHSA-3x77-wg38-92r3"
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},
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{
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"name": "https://github.com/sonirico/mcp-shell/pull/16",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/sonirico/mcp-shell/pull/16"
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},
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{
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"name": "https://github.com/sonirico/mcp-shell/commit/f31377fce6ec31114e5a4398c0e5270552bce09f",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/sonirico/mcp-shell/commit/f31377fce6ec31114e5a4398c0e5270552bce09f"
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},
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{
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"name": "https://github.com/sonirico/mcp-shell/releases/tag/v0.6.0",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/sonirico/mcp-shell/releases/tag/v0.6.0"
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}
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],
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"affected": [
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{
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"vendor": "sonirico",
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"product": "mcp-shell",
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"versions": [
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{
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"version": "< 0.6.0",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-08-25T15:40:10.992Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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."
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}
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],
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"source": {
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"advisory": "GHSA-3x77-wg38-92r3",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/sonirico/mcp-shell/security/advisories/GHSA-3x77-wg38-92r3",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-25T19:01:36.178820Z",
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"id": "CVE-2026-55581",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-25T19:01:56.083Z"
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}
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}
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]
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}
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} |