Vulnerability-Lookup

CNVD-2020-16708

Vulnerability from cnvd - Published: 2020-03-11

Title

urllib3 library拒绝服务漏洞

Description

urllib3是一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 library 1.25.2版本至1.25.7版本（Python）中的util/url.py文件的‘_encode_invalid_chars’函数存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。

Severity

低

Patch Name

urllib3 library拒绝服务漏洞的补丁

Patch Description

urllib3是一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 library 1.25.2版本至1.25.7版本（Python）中的util/url.py文件的‘_encode_invalid_chars’函数存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。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://github.com/urllib3/urllib3/blob/master/CHANGES.rst

Reference

https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a

Impacted products

Name
Python urllib3 >=1.25.2，<=1.25.7

Show details on source website

JSON

To clipboard

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    "cve": {
      "cveNumber": "CVE-2020-7212",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
    }
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  "description": "urllib3\u662f\u4e00\u6b3ePython HTTP\u5e93\u3002\u8be5\u4ea7\u54c1\u5177\u6709\u7ebf\u7a0b\u5b89\u5168\u8fde\u63a5\u6c60\u3001\u6587\u4ef6\u53d1\u5e03\u652f\u6301\u7b49\u3002\n\nurllib3 library 1.25.2\u7248\u672c\u81f31.25.7\u7248\u672c\uff08Python\uff09\u4e2d\u7684util/url.py\u6587\u4ef6\u7684\u2018_encode_invalid_chars\u2019\u51fd\u6570\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002",
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  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-16708",
  "openTime": "2020-03-11",
  "patchDescription": "urllib3\u662f\u4e00\u6b3ePython HTTP\u5e93\u3002\u8be5\u4ea7\u54c1\u5177\u6709\u7ebf\u7a0b\u5b89\u5168\u8fde\u63a5\u6c60\u3001\u6587\u4ef6\u53d1\u5e03\u652f\u6301\u7b49\u3002\r\n\r\nurllib3 library 1.25.2\u7248\u672c\u81f31.25.7\u7248\u672c\uff08Python\uff09\u4e2d\u7684util/url.py\u6587\u4ef6\u7684\u2018_encode_invalid_chars\u2019\u51fd\u6570\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\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": "urllib3 library\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Python urllib3 \u003e=1.25.2\uff0c\u003c=1.25.7"
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  "referenceLink": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a",
  "serverity": "\u4f4e",
  "submitTime": "2020-03-10",
  "title": "urllib3 library\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e"
}

CVE-2020-7212 (GCVE-0-2020-7212)

Vulnerability from cvelistv5 – Published: 2020-03-06 19:14 – Updated: 2024-08-04 09:25

Summary

The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root Scorecard

References

3 references

URL	Tags
https://github.com/urllib3/urllib3/blob/master/CH…	x_refsource_MISC
https://github.com/urllib3/urllib3/commit/a74c9cf…	x_refsource_MISC
https://pypi.org/project/urllib3/1.25.8/	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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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.

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-2020-16708

CVE-2020-7212 (GCVE-0-2020-7212)

Tags

Sightings

Nomenclature

Related by attack behaviour