Vulnerability-Lookup

CNVD-2021-37751

Vulnerability from cnvd - Published: 2021-05-28

Title

Linux Kernel eBPF权限提升漏洞

Description

Linux Kernel是一款开源的操作系统。 Linux Kernel eBPF存在安全漏洞，本地攻击者可利用漏洞提交特殊的请求，可提升权限。

Severity

中

Patch Name

Linux Kernel eBPF权限提升漏洞的补丁

Patch Description

Linux Kernel是一款开源的操作系统。 Linux Kernel eBPF存在安全漏洞，本地攻击者可利用漏洞提交特殊的请求，可提升权限。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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36

Reference

https://www.zerodayinitiative.com/advisories/ZDI-21-503/

Impacted products

Name
Linux Linux kernel

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-31440",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-31440"
    }
  },
  "description": "Linux Kernel\u662f\u4e00\u6b3e\u5f00\u6e90\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nLinux Kernel eBPF\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u63d0\u4ea4\u7279\u6b8a\u7684\u8bf7\u6c42\uff0c\u53ef\u63d0\u5347\u6743\u9650\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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-37751",
  "openTime": "2021-05-28",
  "patchDescription": "Linux Kernel\u662f\u4e00\u6b3e\u5f00\u6e90\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nLinux Kernel eBPF\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u672c\u5730\u653b\u51fb\u8005\u53ef\u5229\u7528\u6f0f\u6d1e\u63d0\u4ea4\u7279\u6b8a\u7684\u8bf7\u6c42\uff0c\u53ef\u63d0\u5347\u6743\u9650\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": "Linux Kernel eBPF\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Linux kernel"
  },
  "referenceLink": "https://www.zerodayinitiative.com/advisories/ZDI-21-503/",
  "serverity": "\u4e2d",
  "submitTime": "2021-05-17",
  "title": "Linux Kernel eBPF\u6743\u9650\u63d0\u5347\u6f0f\u6d1e"
}

CVE-2021-31440 (GCVE-0-2021-31440)

Vulnerability from cvelistv5 – Published: 2021-05-21 14:30 – Updated: 2024-08-03 22:55

Summary

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.

Severity

8.8 (High)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-682 - Incorrect Calculation

Assigner

zdi mitre root

References

3 references

URL	Tags
https://www.zerodayinitiative.com/advisories/ZDI-…	x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021070…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Linux	Kernel	Affected: 5.11.15

Credits

Manfred Paul

Show details on NVD website

JSON

To clipboard

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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T22:55:53.733Z",
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            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36"
          },
          {
            "tags": [
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              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210706-0003/"
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        "title": "CVE Program Container"
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    "cna": {
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          "vendor": "Linux",
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            }
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          "value": "Manfred Paul"
        }
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      "descriptions": [
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          "lang": "en",
          "value": "This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
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            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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      },
      "references": [
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        },
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          "tags": [
            "x_refsource_CONFIRM"
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      "x_legacyV4Record": {
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            },
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              "name": "https://security.netapp.com/advisory/ntap-20210706-0003/",
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    "dateReserved": "2021-04-16T00:00:00.000Z",
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    "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.