ubuntu-cve-2021-3713
Vulnerability from osv_ubuntu
Published
2021-08-25 19:15
Modified
2025-09-08 16:46
Summary
Details

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.

Severity
7.4 (High)
CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "qemu",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-block-extra",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-guest-agent",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-arm",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-common",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-data",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-gui",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-mips",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-misc",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-ppc",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-s390x",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-sparc",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-x86",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-x86-microvm",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-system-x86-xen",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-user",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-user-binfmt",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-user-static",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          },
          {
            "binary_name": "qemu-utils",
            "binary_version": "1:6.2+dfsg-2ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "qemu",
        "purl": "pkg:deb/ubuntu/qemu@1:6.2+dfsg-2ubuntu5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:6.2+dfsg-2ubuntu5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0+dfsg-2expubuntu1",
        "1:6.0+dfsg-2expubuntu2",
        "1:6.0+dfsg-2expubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice-\u003edata3 and UASDevice-\u003estatus3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.",
  "id": "UBUNTU-CVE-2021-3713",
  "modified": "2025-09-08T16:46:47Z",
  "published": "2021-08-25T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3713"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2021-3713"
    },
    {
      "type": "REPORT",
      "url": "https://lists.nongnu.org/archive/html/qemu-devel/2021-08/msg02766.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5307-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3713"
    }
  ],
  "related": [
    "USN-5307-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3713"
  ]
}



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