Vulnerability-Lookup

CNVD-2021-38781

Vulnerability from cnvd - Published: 2021-06-02

Title

Apache Subversion拒绝服务漏洞（CNVD-2021-38781）

Description

Apache Subversion是美国阿帕奇（Apache）基金会的一套开源的版本控制系统。该系统可兼容并发版本系统(CVS)。 Apache Subversion存在拒绝服务漏洞，攻击者可利用该漏洞通过mod authz svn可以触发一个致命错误，导致拒绝服务。

Severity

中

Patch Name

Apache Subversion拒绝服务漏洞（CNVD-2021-38781）的补丁

Patch Description

Apache Subversion是美国阿帕奇（Apache）基金会的一套开源的版本控制系统。该系统可兼容并发版本系统(CVS)。 Apache Subversion存在拒绝服务漏洞，攻击者可利用该漏洞通过mod authz svn可以触发一个致命错误，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

目前厂商已发布升级补丁以修复漏洞，补丁获取链接：https://access.redhat.com/errata/RHSA-2021:0509

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-17525

Impacted products

Name
['Apache Subversion >=1.9.0，<1.10.7', 'Apache Subversion >=1.11.0，<1.14.1']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-17525",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-17525"
    }
  },
  "description": "Apache Subversion\u662f\u7f8e\u56fd\u963f\u5e15\u5947\uff08Apache\uff09\u57fa\u91d1\u4f1a\u7684\u4e00\u5957\u5f00\u6e90\u7684\u7248\u672c\u63a7\u5236\u7cfb\u7edf\u3002\u8be5\u7cfb\u7edf\u53ef\u517c\u5bb9\u5e76\u53d1\u7248\u672c\u7cfb\u7edf(CVS)\u3002\n\nApache Subversion\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7mod authz svn\u53ef\u4ee5\u89e6\u53d1\u4e00\u4e2a\u81f4\u547d\u9519\u8bef\uff0c\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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\uff1ahttps://access.redhat.com/errata/RHSA-2021:0509",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-38781",
  "openTime": "2021-06-02",
  "patchDescription": "Apache Subversion\u662f\u7f8e\u56fd\u963f\u5e15\u5947\uff08Apache\uff09\u57fa\u91d1\u4f1a\u7684\u4e00\u5957\u5f00\u6e90\u7684\u7248\u672c\u63a7\u5236\u7cfb\u7edf\u3002\u8be5\u7cfb\u7edf\u53ef\u517c\u5bb9\u5e76\u53d1\u7248\u672c\u7cfb\u7edf(CVS)\u3002\r\n\r\nApache Subversion\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7mod authz svn\u53ef\u4ee5\u89e6\u53d1\u4e00\u4e2a\u81f4\u547d\u9519\u8bef\uff0c\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": "Apache Subversion\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2021-38781\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Apache Subversion \u003e=1.9.0\uff0c\u003c1.10.7",
      "Apache Subversion \u003e=1.11.0\uff0c\u003c1.14.1"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-17525",
  "serverity": "\u4e2d",
  "submitTime": "2021-03-11",
  "title": "Apache Subversion\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2021-38781\uff09"
}

CVE-2020-17525 (GCVE-0-2020-17525)

Vulnerability from cvelistv5 – Published: 2021-03-17 09:20 – Updated: 2025-02-13 16:27

Title

Remote unauthenticated denial-of-service in Subversion mod_authz_svn

Summary

Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service. This issue was fixed in mod_dav_svn+mod_authz_svn servers 1.14.1 and mod_dav_svn+mod_authz_svn servers 1.10.7

Severity

No CVSS data available.

CWE

CWE-476 - NULL Pointer Dereference

Assigner

apache mitre root

References

2 references

URL	Tags
https://subversion.apache.org/security/CVE-2020-1…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Subversion	Unaffected: mod_authz_svn 1.10.7 Affected: mod_authz_svn , < 1.14.1 (custom)

Credits

Thomas Åkesson (simonsoft.se)

Show details on NVD website

JSON

To clipboard

{
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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T14:00:48.595Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://subversion.apache.org/security/CVE-2020-17525-advisory.txt"
          },
          {
            "name": "[debian-lts-announce] 20210504 [SECURITY] [DLA 2646-1] subversion security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Apache Subversion",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "status": "unaffected",
              "version": "mod_authz_svn 1.10.7"
            },
            {
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              "status": "affected",
              "version": "mod_authz_svn",
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            }
          ]
        }
      ],
      "credits": [
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          "value": "Thomas \u00c5kesson (simonsoft.se)"
        }
      ],
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          "lang": "en",
          "value": "Subversion\u0027s mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service. This issue was fixed in mod_dav_svn+mod_authz_svn servers 1.14.1 and mod_dav_svn+mod_authz_svn servers 1.10.7"
        }
      ],
      "problemTypes": [
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        "dateUpdated": "2024-08-04T14:01:40.000Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
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          "name": "[debian-lts-announce] 20210504 [SECURITY] [DLA 2646-1] subversion security update",
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            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Remote unauthenticated denial-of-service in Subversion mod_authz_svn",
      "workarounds": [
        {
          "lang": "en",
          "value": "As a workaround, the use of in-repository authz rules files with the AuthzSVNReposRelativeAccessFile can be avoided by switching to an alternative configuration which fetches an authz rules file from the server\u0027s filesystem, rather than from an SVN repository."
        }
      ],
      "x_generator": {
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        },
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            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Apache Subversion",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_name": "mod_authz_svn",
                            "version_value": "1.14.1"
                          },
                          {
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                          }
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                "vendor_name": "Apache Software Foundation"
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        },
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              "name": "https://subversion.apache.org/security/CVE-2020-17525-advisory.txt",
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              "url": "https://subversion.apache.org/security/CVE-2020-17525-advisory.txt"
            },
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              "name": "[debian-lts-announce] 20210504 [SECURITY] [DLA 2646-1] subversion security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html"
            }
          ]
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        "source": {
          "discovery": "UNKNOWN"
        },
        "work_around": [
          {
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            "value": "As a workaround, the use of in-repository authz rules files with the AuthzSVNReposRelativeAccessFile can be avoided by switching to an alternative configuration which fetches an authz rules file from the server\u0027s filesystem, rather than from an SVN repository."
          }
        ]
      }
    }
  },
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    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2020-17525",
    "datePublished": "2021-03-17T09:20:14.000Z",
    "dateReserved": "2020-08-12T00:00:00.000Z",
    "dateUpdated": "2025-02-13T16:27:35.247Z",
    "state": "PUBLISHED"
  },
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  "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.
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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.

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.
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CNVD-2021-38781

CVE-2020-17525 (GCVE-0-2020-17525)

Tags

Sightings

Nomenclature

Related by attack behaviour