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CVE-2026-4851

Estado: ModificadaCrítica (9.8)—

GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.

GRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.

read_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()

$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:

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This executes on the client silently on every RPC call, as the return values remain correct.

This functionality is by design but the trust requirement for the remote host is not documented in the distribution.

Detalles técnicos trazas, registros y código del informe original
  $arg .= '$VAR1';
  my $val = eval "no strict; $arg"; # line 40-41

  $VAR1 = do { system("..."); };

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

Casiano — Grid\

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-4851",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-4851",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-01T14:17:04.307893Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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    ]
  },
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "CASIANO",
          "product": "GRID::Machine",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "custom",
              "lessThanOrEqual": "0.127"
            }
          ],
          "packageName": "GRID-Machine",
          "programFiles": [
            "lib/GRID/Machine/Message.pm"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "GRID::Machine::read_operation()"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-29T01:15:56.967",
  "references": [
    {
      "url": "https://www.openwall.com/lists/oss-security/2026/03/26/6",
      "tags": [
        "Mailing List"
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/03/26/6",
      "tags": [
        "Mailing List"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "description": [
        {
          "lang": "en",
          "value": "CWE-95"
        },
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.\n\nGRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.\n\nread_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()\n\n  $arg .= '$VAR1';\n  my $val = eval \"no strict; $arg\"; # line 40-41\n\n$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:\n\n  $VAR1 = do { system(\"...\"); };\n\nThis executes on the client silently on every RPC call, as the return values remain correct.\n\nThis functionality is by design but the trust requirement for the remote host is not documented in the distribution."
    },
    {
      "lang": "es",
      "value": "Las versiones de GRID::Machine hasta la 0.127 para Perl permiten ejecución de código arbitrario a través de deserialización insegura.\n\nGRID::Machine proporciona Llamadas a Procedimientos Remotos (RPC) sobre SSH para Perl. El cliente se conecta a hosts remotos para ejecutar código en ellos. Un host remoto comprometido o malicioso puede ejecutar código arbitrario de vuelta en el cliente a través de deserialización insegura en el protocolo RPC.\n\nread_operation() en lib/GRID/Machine/Message.pm deserializa valores del lado remoto usando eval()\n\n  $arg .= '$VAR1';\n  my $val = eval \"no strict; $arg\"; # línea 40-41\n\n$arg son bytes en bruto de la tubería del protocolo. Un host remoto comprometido puede incrustar Perl arbitrario en la respuesta con formato Dumper:\n\n  $VAR1 = do { system(\"...\"); };\n\nEsto se ejecuta en el cliente silenciosamente en cada llamada RPC, ya que los valores de retorno permanecen correctos.\n\nEsta funcionalidad es intencional, pero el requisito de confianza para el host remoto no está documentado en la distribución."
    }
  ],
  "lastModified": "2026-06-17T10:57:20.807",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:casiano:grid\\:\\:machine:*:*:*:*:*:perl:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B3148991-8DC2-4D2F-8EC2-0DCB0E5B6A63",
              "versionEndIncluding": "0.127"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}