GSD-2021-3695

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.
Aliases
Aliases
CVE-2021-3695
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{
  "GSD": {
    "alias": "CVE-2021-3695",
    "description": "A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.",
    "id": "GSD-2021-3695",
    "references": [
      "https://security.archlinux.org/CVE-2021-3695",
      "https://linux.oracle.com/cve/CVE-2021-3695.html",
      "https://access.redhat.com/errata/RHSA-2022:5095",
      "https://access.redhat.com/errata/RHSA-2022:5096",
      "https://access.redhat.com/errata/RHSA-2022:5098",
      "https://access.redhat.com/errata/RHSA-2022:5099",
      "https://access.redhat.com/errata/RHSA-2022:5100",
      "https://www.suse.com/security/cve/CVE-2021-3695.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "id": "GSD-2021-3695",
      "modified": "2023-12-13T01:23:34.911373Z",
      "schema_version": "1.4.0"
    }
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          "acInsufInfo": false,
          "cvssV2": {
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            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.4,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
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          "obtainAllPrivilege": false,
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            "availabilityImpact": "LOW",
            "baseScore": 4.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
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          "exploitabilityScore": 1.0,
          "impactScore": 3.4
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      },
      "lastModifiedDate": "2023-09-13T16:15Z",
      "publishedDate": "2022-07-06T16:15Z"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.