Vulnerability-Lookup

CNVD-2021-39532

Vulnerability from cnvd - Published: 2021-06-04

Title

FFmpeg缓冲区溢出漏洞（CNVD-2021-39532）

Description

FFmpeg是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序，采用LGPL或GPL许可证。 FFmpeg 4.2版中的libavfilter/vf_fieldmatch.c中的build_diff_map函数存在缓冲区溢出漏洞。攻击者可利用该漏洞导致拒绝服务。

Severity

中

Patch Name

FFmpeg缓冲区溢出漏洞（CNVD-2021-39532）的补丁

Patch Description

FFmpeg是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序，采用LGPL或GPL许可证。 FFmpeg 4.2版中的libavfilter/vf_fieldmatch.c中的build_diff_map函数存在缓冲区溢出漏洞。攻击者可利用该漏洞导致拒绝服务。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

厂商已发布了漏洞修复程序，请及时关注更新： http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=ce5274c1385d55892a692998923802023526b765

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-22020

Impacted products

Name
FFmpeg FFmpeg 4.2

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-22020",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-22020"
    }
  },
  "description": "FFmpeg\u662f\u4e00\u5957\u53ef\u4ee5\u7528\u6765\u8bb0\u5f55\u3001\u8f6c\u6362\u6570\u5b57\u97f3\u9891\u3001\u89c6\u9891\uff0c\u5e76\u80fd\u5c06\u5176\u8f6c\u5316\u4e3a\u6d41\u7684\u5f00\u6e90\u8ba1\u7b97\u673a\u7a0b\u5e8f\uff0c\u91c7\u7528LGPL\u6216GPL\u8bb8\u53ef\u8bc1\u3002\n\nFFmpeg 4.2\u7248\u4e2d\u7684libavfilter/vf_fieldmatch.c\u4e2d\u7684build_diff_map\u51fd\u6570\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttp://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=ce5274c1385d55892a692998923802023526b765",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-39532",
  "openTime": "2021-06-04",
  "patchDescription": "FFmpeg\u662f\u4e00\u5957\u53ef\u4ee5\u7528\u6765\u8bb0\u5f55\u3001\u8f6c\u6362\u6570\u5b57\u97f3\u9891\u3001\u89c6\u9891\uff0c\u5e76\u80fd\u5c06\u5176\u8f6c\u5316\u4e3a\u6d41\u7684\u5f00\u6e90\u8ba1\u7b97\u673a\u7a0b\u5e8f\uff0c\u91c7\u7528LGPL\u6216GPL\u8bb8\u53ef\u8bc1\u3002\r\n\r\nFFmpeg 4.2\u7248\u4e2d\u7684libavfilter/vf_fieldmatch.c\u4e2d\u7684build_diff_map\u51fd\u6570\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\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": "FFmpeg\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-39532\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "FFmpeg FFmpeg 4.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-22020",
  "serverity": "\u4e2d",
  "submitTime": "2021-05-27",
  "title": "FFmpeg\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-39532\uff09"
}

CVE-2020-22020 (GCVE-0-2020-22020)

Vulnerability from cvelistv5 – Published: 2021-05-26 19:08 – Updated: 2024-08-04 14:30

Summary

Buffer Overflow vulnerability in FFmpeg 4.2 in the build_diff_map function in libavfilter/vf_fieldmatch.c, which could let a remote malicious user cause a Denial of Service.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://trac.ffmpeg.org/ticket/8239	x_refsource_MISC
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitd…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4990	vendor-advisoryx_refsource_DEBIAN

Show details on NVD website

JSON

To clipboard

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          },
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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.

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.