Vulnerability-Lookup

oesa-2021-1012

Vulnerability from osv_openeuler

Published

2021-02-04 11:04

Modified

2026-08-06 11:04

Summary

qemu security update

Details

QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed. QEMU has two operating modes: Full system emulation. In this mode, QEMU emulates a full system (for example a PC), including one or several processors and various peripherals. It can be used to launch different Operating Systems without rebooting the PC or to debug system code. User mode emulation. In this mode, QEMU can launch processes compiled for one CPU on another CPU. It can be used to launch the Wine Windows API emulator (https://www.winehq.org) or to ease cross-compilation and cross-debugging. You can refer to https://www.qemu.org for more infortmation.\r\n\r\n Security Fix(es):\r\n\r\n A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.(CVE-2020-27821)\r\n\r\n

Severity

6.0 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-27821	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "qemu-debugsource-4.1.0-32.oe1.aarch64.rpm",
          "qemu-4.1.0-32.oe1.aarch64.rpm",
          "qemu-img-4.1.0-32.oe1.aarch64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.aarch64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.aarch64.rpm",
          "qemu-debugsource-4.1.0-32.oe1.aarch64.rpm",
          "qemu-4.1.0-32.oe1.aarch64.rpm",
          "qemu-img-4.1.0-32.oe1.aarch64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.aarch64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.aarch64.rpm"
        ],
        "noarch": [
          "qemu-help-4.1.0-32.oe1.noarch.rpm",
          "qemu-help-4.1.0-32.oe1.noarch.rpm"
        ],
        "src": [
          "qemu-4.1.0-32.oe1.src.rpm",
          "qemu-4.1.0-32.oe1.src.rpm"
        ],
        "x86_64": [
          "qemu-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debugsource-4.1.0-32.oe1.x86_64.rpm",
          "qemu-img-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.x86_64.rpm",
          "qemu-seabios-4.1.0-32.oe1.x86_64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.x86_64.rpm",
          "qemu-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debugsource-4.1.0-32.oe1.x86_64.rpm",
          "qemu-img-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.x86_64.rpm",
          "qemu-seabios-4.1.0-32.oe1.x86_64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS",
        "name": "qemu",
        "purl": "pkg:rpm/openEuler/qemu\u0026distro=openEuler-20.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.0-32.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "qemu-debugsource-4.1.0-32.oe1.aarch64.rpm",
          "qemu-4.1.0-32.oe1.aarch64.rpm",
          "qemu-img-4.1.0-32.oe1.aarch64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.aarch64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.aarch64.rpm"
        ],
        "noarch": [
          "qemu-help-4.1.0-32.oe1.noarch.rpm"
        ],
        "src": [
          "qemu-4.1.0-32.oe1.src.rpm"
        ],
        "x86_64": [
          "qemu-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debugsource-4.1.0-32.oe1.x86_64.rpm",
          "qemu-img-4.1.0-32.oe1.x86_64.rpm",
          "qemu-debuginfo-4.1.0-32.oe1.x86_64.rpm",
          "qemu-seabios-4.1.0-32.oe1.x86_64.rpm",
          "qemu-guest-agent-4.1.0-32.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "qemu",
        "purl": "pkg:rpm/openEuler/qemu\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.0-32.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.  QEMU has two operating modes:     Full system emulation. In this mode, QEMU emulates a full system (for example a PC),    including one or several processors and various peripherals. It can be used to launch    different Operating Systems without rebooting the PC or to debug system code.     User mode emulation. In this mode, QEMU can launch processes compiled for one CPU on another CPU.    It can be used to launch the Wine Windows API emulator (https://www.winehq.org) or to ease    cross-compilation and cross-debugging. You can refer to https://www.qemu.org for more infortmation.\\r\\n\\r\\n\r\nSecurity Fix(es):\\r\\n\\r\\n\r\nA flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.(CVE-2020-27821)\\r\\n\\r\\n",
  "id": "OESA-2021-1012",
  "modified": "2026-08-06T11:04:14Z",
  "published": "2021-02-04T11:04:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1012"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27821"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "qemu security update",
  "upstream": [
    "CVE-2020-27821"
  ]
}

CVE-2020-27821 (GCVE-0-2020-27821)

Vulnerability from cvelistv5 – Published: 2020-12-08 21:33 – Updated: 2024-08-04 16:25

Summary

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

Severity

No CVSS data available.

CWE

CWE-787 - >CWE-122

Assigner

redhat redhat root

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1902651	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/12/16/6	mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2021011…	x_refsource_CONFIRM
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	QEMU	Affected: prior to 5.2.0

Show details on NVD website

JSON

To clipboard

{
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          "dateUpdated": "2024-08-04T16:25:42.445Z",
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              "x_refsource_CONFIRM",
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            "url": "https://security.netapp.com/advisory/ntap-20210115-0006/"
          },
          {
            "name": "[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update",
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            "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "QEMU",
          "vendor": "n/a",
          "versions": [
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        }
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Sightings

Author	Source	Type	Date	Other

Nomenclature

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.