Vulnerability-Lookup

CNVD-2021-14748

Vulnerability from cnvd - Published: 2021-03-06

Title

GNU Binutils访问控制错误漏洞

Description

GNU Binutils（GNU Binary Utilities或binutils）是GNU社区的开发的一组编程语言工具程序。该程序主要用于处理多种格式的目标文件，并提供有连接器、汇编器和其他用于目标文件和档案的工具。 GNU binutils中存在访问控制错误漏洞，该漏洞源于允许通过smart_rename()绕过访问限制，攻击者可通过该漏洞读取或更改数据。

Severity

中

Patch Name

GNU Binutils访问控制错误漏洞的补丁

Patch Description

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://bugzilla.redhat.com/show_bug.cgi?id=1913743

Reference

https://vigilance.fr/vulnerability/GNU-binutils-read-write-access-via-smart-rename-34500

Impacted products

Name
GNU Binutils

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-20197",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-20197"
    }
  },
  "description": "GNU Binutils\uff08GNU Binary Utilities\u6216binutils\uff09\u662fGNU\u793e\u533a\u7684\u5f00\u53d1\u7684\u4e00\u7ec4\u7f16\u7a0b\u8bed\u8a00\u5de5\u5177\u7a0b\u5e8f\u3002\u8be5\u7a0b\u5e8f\u4e3b\u8981\u7528\u4e8e\u5904\u7406\u591a\u79cd\u683c\u5f0f\u7684\u76ee\u6807\u6587\u4ef6\uff0c\u5e76\u63d0\u4f9b\u6709\u8fde\u63a5\u5668\u3001\u6c47\u7f16\u5668\u548c\u5176\u4ed6\u7528\u4e8e\u76ee\u6807\u6587\u4ef6\u548c\u6863\u6848\u7684\u5de5\u5177\u3002\n\nGNU binutils\u4e2d\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5141\u8bb8\u901a\u8fc7smart_rename()\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\uff0c\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u8bfb\u53d6\u6216\u66f4\u6539\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://bugzilla.redhat.com/show_bug.cgi?id=1913743",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-14748",
  "openTime": "2021-03-06",
  "patchDescription": "GNU Binutils\uff08GNU Binary Utilities\u6216binutils\uff09\u662fGNU\u793e\u533a\u7684\u5f00\u53d1\u7684\u4e00\u7ec4\u7f16\u7a0b\u8bed\u8a00\u5de5\u5177\u7a0b\u5e8f\u3002\u8be5\u7a0b\u5e8f\u4e3b\u8981\u7528\u4e8e\u5904\u7406\u591a\u79cd\u683c\u5f0f\u7684\u76ee\u6807\u6587\u4ef6\uff0c\u5e76\u63d0\u4f9b\u6709\u8fde\u63a5\u5668\u3001\u6c47\u7f16\u5668\u548c\u5176\u4ed6\u7528\u4e8e\u76ee\u6807\u6587\u4ef6\u548c\u6863\u6848\u7684\u5de5\u5177\u3002\r\n\r\nGNU binutils\u4e2d\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5141\u8bb8\u901a\u8fc7smart_rename()\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\uff0c\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u8bfb\u53d6\u6216\u66f4\u6539\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": "GNU Binutils\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "GNU Binutils"
  },
  "referenceLink": "https://vigilance.fr/vulnerability/GNU-binutils-read-write-access-via-smart-rename-34500",
  "serverity": "\u4e2d",
  "submitTime": "2021-03-05",
  "title": "GNU Binutils\u8bbf\u95ee\u63a7\u5236\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2021-20197 (GCVE-0-2021-20197)

Vulnerability from cvelistv5 – Published: 2021-03-26 16:47 – Updated: 2025-12-03 15:08

Summary

There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar, objcopy, strip, ranlib. When these utilities are run as a privileged user (presumably as part of a script updating binaries across different users), an unprivileged user can trick these utilities into getting ownership of arbitrary files through a symlink.

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-03 15:08 UTC

CWE

CWE-59

Assigner

redhat redhat root

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1913743	x_refsource_MISC
https://sourceware.org/bugzilla/show_bug.cgi?id=26945	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021052…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-30	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
n/a	binutils	Affected: binutils 2.35

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:30:07.480Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1913743"
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              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=26945"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210528-0009/"
          },
          {
            "name": "GLSA-202208-30",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
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          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-20197",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-03T15:08:08.170713Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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        {
          "product": "binutils",
          "vendor": "n/a",
          "versions": [
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              "status": "affected",
              "version": "binutils 2.35"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar, objcopy, strip, ranlib. When these utilities are run as a privileged user (presumably as part of a script updating binaries across different users), an unprivileged user can trick these utilities into getting ownership of arbitrary files through a symlink."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-59",
              "description": "CWE-59",
              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2022-08-15T00:12:01.000Z",
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      },
      "references": [
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1913743"
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          "tags": [
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          "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=26945"
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            "x_refsource_CONFIRM"
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          "url": "https://security.netapp.com/advisory/ntap-20210528-0009/"
        },
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          "name": "GLSA-202208-30",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
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          "url": "https://security.gentoo.org/glsa/202208-30"
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    "assignerShortName": "redhat",
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    "datePublished": "2021-03-26T16:47:20.000Z",
    "dateReserved": "2020-12-17T00:00:00.000Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

CNVD-2021-14748

CVE-2021-20197 (GCVE-0-2021-20197)

Tags

Sightings

Nomenclature

Related by attack behaviour