« Back to list

CVE-2018-6855

Status: ModifiedHigh (7.8)—

Sophos SafeGuard Enterprise before 8.00.5, SafeGuard Easy before 7.00.3, and SafeGuard LAN Crypt before 3.95.2 are vulnerable to Local Privilege Escalation via IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (3)

Sophos — Safeguard Easy Device Encryption ClientSophos — Safeguard Enterprise ClientSophos — Safeguard LAN Crypt Client

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2018-6855",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.2,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": true,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2018-07-09T18:29:00.903",
  "references": [
    {
      "url": "http://seclists.org/fulldisclosure/2018/Jul/20",
      "tags": [
        "Issue Tracking",
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://community.sophos.com/kb/en-us/131934",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities/",
      "tags": [
        "Exploit",
        "Technical Description",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2018/Jul/20",
      "tags": [
        "Issue Tracking",
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://community.sophos.com/kb/en-us/131934",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities/",
      "tags": [
        "Exploit",
        "Technical Description",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Sophos SafeGuard Enterprise before 8.00.5, SafeGuard Easy before 7.00.3, and SafeGuard LAN Crypt before 3.95.2 are vulnerable to Local Privilege Escalation via IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context."
    },
    {
      "lang": "es",
      "value": "Sophos SafeGuard Enterprise en versiones anteriores a la 8.00.5, SafeGuard Easy en versiones anteriores a la 7.00.3, y SafeGuard LAN Crypt en versiones anteriores a la 3.95.2 son vulnerables a una escalada de privilegios local mediante IOCTL 0x80202014. Manipulando un búfer de entrada, es posible controlar la ruta de ejecución al punto en el que la constante 0xFFFFFFF se escribirá en una dirección controlada por el usuario. Se puede aprovechar esta situación para modificar la estructura SEP_TOKEN_PRIVILEGES del objeto Token que pertenece al proceso del exploit y otorgar privilegios SE_DEBUG_NAME. Esto permite que el proceso del exploit interactúe con procesos con privilegios más elevados que se ejecutan como SYSTEM, ejecutando código en su contexto de seguridad."
    }
  ],
  "lastModified": "2026-06-17T02:02:21.810",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_easy_device_encryption_client:6.00:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2F57138C-7C06-496F-994E-0966CE8212C0"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_easy_device_encryption_client:6.10:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C35D6EE3-06A4-4720-A41F-A853CBF5AD31"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_easy_device_encryption_client:7.00:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3EC3A868-4328-4C39-9846-8E1182E747CB"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:5.60.3:vs-nfd:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1831A4DA-2F50-411A-924F-FF0E15A593A0"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:6.00:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7D8F90D7-7D25-418F-AE85-AD1D7E60DD18"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:6.00.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "864E1982-8947-4EF7-912D-CDFD74E8D134"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:6.10:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "60BBA33F-853D-407B-975B-A9182B259DB9"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:7.00:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "88E54DC4-12A5-452F-8DCE-890645585097"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_enterprise_client:8.00:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3075C40D-1FF9-46D0-80F3-2EF8E8423974"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_lan_crypt_client:3.90.1:ts:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4BCE0FAF-54C0-420D-BA05-F90848408515"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_lan_crypt_client:3.90.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4CD621BA-6AB7-427D-B6D0-D2D75D1ADC18"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_lan_crypt_client:3.95.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C82A7CD5-0703-47E1-BA4F-3797986CE139"
            },
            {
              "criteria": "cpe:2.3:a:sophos:safeguard_lan_crypt_client:3.95.1:ts:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2D0F50CA-6C19-4ECF-97B7-6636A2756961"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}