Vulnerability-Lookup

CNVD-2021-09495

Vulnerability from cnvd - Published: 2021-02-06

Title

QEMU访问控制错误漏洞

Description

QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。 QEMU存在访问控制错误漏洞，攻击者可利用该漏洞可以通过virtiofsd绕过访问限制，以便读取或更改主机系统上的数据。

Severity

中

Patch Name

QEMU访问控制错误漏洞的补丁

Patch Description

QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。 QEMU存在访问控制错误漏洞，攻击者可利用该漏洞可以通过virtiofsd绕过访问限制，以便读取或更改主机系统上的数据。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

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-35517

Impacted products

Name
Qemu QEMU

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-35517",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-35517"
    }
  },
  "description": "QEMU\uff08Quick Emulator\uff09\u662f\u6cd5\u56fd\u6cd5\u5e03\u91cc\u65af-\u8d1d\u62c9\uff08Fabrice Bellard\uff09\u4e2a\u4eba\u5f00\u53d1\u8005\u7684\u4e00\u5957\u6a21\u62df\u5904\u7406\u5668\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u5177\u6709\u901f\u5ea6\u5feb\u3001\u8de8\u5e73\u53f0\u7b49\u7279\u70b9\u3002\n\nQEMU\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u4ee5\u901a\u8fc7virtiofsd\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\uff0c\u4ee5\u4fbf\u8bfb\u53d6\u6216\u66f4\u6539\u4e3b\u673a\u7cfb\u7edf\u4e0a\u7684\u6570\u636e\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-09495",
  "openTime": "2021-02-06",
  "patchDescription": "QEMU\uff08Quick Emulator\uff09\u662f\u6cd5\u56fd\u6cd5\u5e03\u91cc\u65af-\u8d1d\u62c9\uff08Fabrice Bellard\uff09\u4e2a\u4eba\u5f00\u53d1\u8005\u7684\u4e00\u5957\u6a21\u62df\u5904\u7406\u5668\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u5177\u6709\u901f\u5ea6\u5feb\u3001\u8de8\u5e73\u53f0\u7b49\u7279\u70b9\u3002\r\n\r\nQEMU\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u4ee5\u901a\u8fc7virtiofsd\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\uff0c\u4ee5\u4fbf\u8bfb\u53d6\u6216\u66f4\u6539\u4e3b\u673a\u7cfb\u7edf\u4e0a\u7684\u6570\u636e\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\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Qemu QEMU"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-35517",
  "serverity": "\u4e2d",
  "submitTime": "2021-02-03",
  "title": "QEMU\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2020-35517 (GCVE-0-2020-35517)

Vulnerability from cvelistv5 – Published: 2021-01-28 19:13 – Updated: 2024-08-04 17:02

Summary

A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices.

Severity

No CVSS data available.

CWE

CWE-269

Assigner

redhat redhat root

References

6 references

URL	Tags
https://github.com/qemu/qemu/commit/ebf101955ce8f…	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=1915823	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
https://lists.gnu.org/archive/html/qemu-devel/202…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021031…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-27	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
n/a	qemu	Affected: qemu 5.2.0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T17:02:08.231Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "https://github.com/qemu/qemu/commit/ebf101955ce8f8d72fba103b5151115a4335de2c"
          },
          {
            "tags": [
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          {
            "tags": [
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            "url": "https://www.openwall.com/lists/oss-security/2021/01/22/1"
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            "url": "https://security.netapp.com/advisory/ntap-20210312-0002/"
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          {
            "name": "GLSA-202208-27",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202208-27"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "qemu",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "qemu 5.2.0"
            }
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      "descriptions": [
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        }
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      "problemTypes": [
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      "providerMetadata": {
        "dateUpdated": "2022-08-14T19:06:06.000Z",
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        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1915823"
        },
        {
          "tags": [
            "x_refsource_MISC"
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          "url": "https://www.openwall.com/lists/oss-security/2021/01/22/1"
        },
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          "tags": [
            "x_refsource_MISC"
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          "url": "https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html"
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        {
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          "url": "https://security.netapp.com/advisory/ntap-20210312-0002/"
        },
        {
          "name": "GLSA-202208-27",
          "tags": [
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          "url": "https://security.gentoo.org/glsa/202208-27"
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  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2020-35517",
    "datePublished": "2021-01-28T19:13:54.000Z",
    "dateReserved": "2020-12-17T00:00:00.000Z",
    "dateUpdated": "2024-08-04T17:02:08.231Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.