github - ghsa-9237-5j3g-vhw4

ghsa-9237-5j3g-vhw4

Vulnerability from github

Published

2025-07-11 18:30

Modified

2025-11-03 21:34

Severity ?

8.2 (High) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Details

A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-7027"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-11T16:15:27Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.",
  "id": "GHSA-9237-5j3g-vhw4",
  "modified": "2025-11-03T21:34:05Z",
  "published": "2025-07-11T18:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-7027"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/746790"
    },
    {
      "type": "WEB",
      "url": "https://www.binarly.io/advisories/brly-2025-009"
    },
    {
      "type": "WEB",
      "url": "https://www.gigabyte.com/Support/Security"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/746790"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-7027 (GCVE-0-2025-7027)

Vulnerability from cvelistv5

Published

2025-07-11 15:24

Modified

2025-11-03 20:07

Severity ?

8.2 (High) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-822 Untrusted Pointer Dereference

Summary

A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.

References

URL

Tags

	https://www.gigabyte.com/Support/Security
	https://www.binarly.io/advisories/brly-2025-009
	https://kb.cert.org/vuls/id/746790

Impacted products

	Vendor	Product	Version
	GIGABYTE	UEFI-GenericComponentSmmEntry	Version: 1.0.0

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 8.2,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "HIGH",
              "scope": "CHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-7027",
                "options": [
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                  },
                  {
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-12T03:55:16.831604Z",
                "version": "2.0.3"
              },
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            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-07-15T14:44:51.936Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:07:21.390Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
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            "url": "https://www.kb.cert.org/vuls/id/746790"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "UEFI-GenericComponentSmmEntry",
          "vendor": "GIGABYTE",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-822 Untrusted Pointer Dereference",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-11T15:24:26.568Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://www.gigabyte.com/Support/Security"
        },
        {
          "url": "https://www.binarly.io/advisories/brly-2025-009"
        },
        {
          "url": "https://kb.cert.org/vuls/id/746790"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "SMM Arbitrary Write via Dual-Controlled Pointers in CommandRcx1",
      "x_generator": {
        "engine": "VINCE 3.0.21",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2025-7027"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2025-7027",
    "datePublished": "2025-07-11T15:24:26.568Z",
    "dateReserved": "2025-07-02T15:43:08.076Z",
    "dateUpdated": "2025-11-03T20:07:21.390Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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