Vulnerability-Lookup

CNVD-2021-92473

Vulnerability from cnvd - Published: 2021-11-30

Title

LibreCad缓冲区溢出漏洞（CNVD-2021-92473）

Description

LibreCAD是LibreCAD组织的一款开源的CAD（计算机辅助设计）应用程序。 LibreCad libdxfrw 中存在缓冲区错误漏洞，该漏洞源于产品的dwgCompressor：：copyCompBytes21函数未能正确处理特殊的输入数据。攻击者可通过该漏洞导致堆缓冲区溢出。

Severity

中

Patch Name

LibreCad缓冲区溢出漏洞的补丁

Patch Description

LibreCAD是LibreCAD组织的一款开源的CAD（计算机辅助设计）应用程序。 LibreCad libdxfrw 中存在缓冲区错误漏洞，该漏洞源于产品的dwgCompressor：：copyCompBytes21函数未能正确处理特殊的输入数据。攻击者可通过该漏洞导致堆缓冲区溢出。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，详情请关注厂商主页： https://librecad.org/

Reference

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350

Impacted products

Name
LibreCAD LibreCAD

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-21899"
    }
  },
  "description": "LibreCAD\u662fLibreCAD\u7ec4\u7ec7\u7684\u4e00\u6b3e\u5f00\u6e90\u7684CAD\uff08\u8ba1\u7b97\u673a\u8f85\u52a9\u8bbe\u8ba1\uff09\u5e94\u7528\u7a0b\u5e8f\u3002\n\nLibreCad libdxfrw \u4e2d\u5b58\u5728\u7f13\u51b2\u533a\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4ea7\u54c1\u7684dwgCompressor\uff1a\uff1acopyCompBytes21\u51fd\u6570\u672a\u80fd\u6b63\u786e\u5904\u7406\u7279\u6b8a\u7684\u8f93\u5165\u6570\u636e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8be6\u60c5\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\uff1a\r\nhttps://librecad.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-92473",
  "openTime": "2021-11-30",
  "patchDescription": "LibreCAD\u662fLibreCAD\u7ec4\u7ec7\u7684\u4e00\u6b3e\u5f00\u6e90\u7684CAD\uff08\u8ba1\u7b97\u673a\u8f85\u52a9\u8bbe\u8ba1\uff09\u5e94\u7528\u7a0b\u5e8f\u3002\r\n\r\nLibreCad libdxfrw \u4e2d\u5b58\u5728\u7f13\u51b2\u533a\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4ea7\u54c1\u7684dwgCompressor\uff1a\uff1acopyCompBytes21\u51fd\u6570\u672a\u80fd\u6b63\u786e\u5904\u7406\u7279\u6b8a\u7684\u8f93\u5165\u6570\u636e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\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": "LibreCad\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "LibreCAD LibreCAD"
  },
  "referenceLink": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350",
  "serverity": "\u4e2d",
  "submitTime": "2021-11-22",
  "title": "LibreCad\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-92473\uff09"
}

CVE-2021-21899 (GCVE-0-2021-21899)

Vulnerability from cvelistv5 – Published: 2021-11-19 00:00 – Updated: 2024-08-03 18:30

Summary

A code execution vulnerability exists in the dwgCompressor::copyCompBytes21 functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dwg file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Severity

8.8 (High)


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

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

talos mitre root

References

6 references

URL	Tags
https://talosintelligence.com/vulnerability_repor…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2021…	mailing-list
https://www.debian.org/security/2022/dsa-5077	vendor-advisory
https://security.gentoo.org/glsa/202305-26	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	LibreCAD	Affected: LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:30:22.887Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350"
          },
          {
            "name": "FEDORA-2021-fa9e3c23f2",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/"
          },
          {
            "name": "FEDORA-2021-67c946a9f3",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/"
          },
          {
            "name": "[debian-lts-announce] 20211203 [SECURITY] [DLA 2838-1] librecad security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00002.html"
          },
          {
            "name": "DSA-5077",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2022/dsa-5077"
          },
          {
            "name": "GLSA-202305-26",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202305-26"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "LibreCAD",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A code execution vulnerability exists in the dwgCompressor::copyCompBytes21 functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dwg file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-119",
              "description": "CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-05-21T00:00:00.000Z",
        "orgId": "b86d76f8-0f8a-4a96-a78d-d8abfc7fc29b",
        "shortName": "talos"
      },
      "references": [
        {
          "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350"
        },
        {
          "name": "FEDORA-2021-fa9e3c23f2",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/"
        },
        {
          "name": "FEDORA-2021-67c946a9f3",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/"
        },
        {
          "name": "[debian-lts-announce] 20211203 [SECURITY] [DLA 2838-1] librecad security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00002.html"
        },
        {
          "name": "DSA-5077",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2022/dsa-5077"
        },
        {
          "name": "GLSA-202305-26",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202305-26"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b86d76f8-0f8a-4a96-a78d-d8abfc7fc29b",
    "assignerShortName": "talos",
    "cveId": "CVE-2021-21899",
    "datePublished": "2021-11-19T00:00:00.000Z",
    "dateReserved": "2021-01-04T00:00:00.000Z",
    "dateUpdated": "2024-08-03T18:30:22.887Z",
    "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.

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CNVD-2021-92473

CVE-2021-21899 (GCVE-0-2021-21899)

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Nomenclature

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