Vulnerability-Lookup

CNVD-2021-39771

Vulnerability from cnvd - Published: 2021-06-06

Title

QEMU msix_table_mmio_write()缓冲区溢出漏洞

Description

QEMU是一套模拟处理器软件。 QEMU msix_table_mmio_write()存在缓冲区溢出漏洞。攻击者可利用漏洞使主机上的QEMU进程崩溃，从而导致拒绝服务。

Severity

低

Patch Name

QEMU msix_table_mmio_write()缓冲区溢出漏洞的补丁

Patch Description

QEMU是一套模拟处理器软件。 QEMU msix_table_mmio_write()存在缓冲区溢出漏洞。攻击者可利用漏洞使主机上的QEMU进程崩溃，从而导致拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

用户可参考如下厂商提供的安全补丁以修复该漏洞： https://bugzilla.redhat.com/show_bug.cgi?id=1902651

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=1902651

Impacted products

Name
Qemu QEMU <5.2.0

Show details on source website

JSON

To clipboard

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    "cve": {
      "cveNumber": "CVE-2020-27821",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-27821"
    }
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  "description": "QEMU\u662f\u4e00\u5957\u6a21\u62df\u5904\u7406\u5668\u8f6f\u4ef6\u3002\n\nQEMU msix_table_mmio_write()\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u4f7f\u4e3b\u673a\u4e0a\u7684QEMU\u8fdb\u7a0b\u5d29\u6e83\uff0c\u4ece\u800c\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002",
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  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-39771",
  "openTime": "2021-06-06",
  "patchDescription": "QEMU\u662f\u4e00\u5957\u6a21\u62df\u5904\u7406\u5668\u8f6f\u4ef6\u3002\r\n\r\nQEMU msix_table_mmio_write()\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u4f7f\u4e3b\u673a\u4e0a\u7684QEMU\u8fdb\u7a0b\u5d29\u6e83\uff0c\u4ece\u800c\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "QEMU msix_table_mmio_write()\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Qemu QEMU \u003c5.2.0"
  },
  "referenceLink": "https://bugzilla.redhat.com/show_bug.cgi?id=1902651",
  "serverity": "\u4f4e",
  "submitTime": "2020-12-07",
  "title": "QEMU msix_table_mmio_write()\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

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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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.