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CNVD-2021-03033

Vulnerability from cnvd - Published: 2021-01-14

Title

Openbsd Opensmtpd空指针解引用漏洞

Description

OpenSMTPD是实现简单邮件传输协议的Unix守护程序，用于在本地计算机上传递邮件或将邮件中继到其他SMTP服务器。 OpenSMTPD 6.8.0p1之前版本中的smtpd/lka_filter.c存在空指针解引用漏洞。该漏洞源于过滤器状态机未能能正确维护SMTP引擎和过滤器层之间的I/O通道。远程攻击者可通过特制客户端活动模式利用该漏洞导致拒绝服务。

Severity

中

Patch Name

Openbsd Opensmtpd空指针解引用漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新：https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-35680

Impacted products

Name
Openbsd OpenSMTPD <6.8.0p1

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-35680",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-35680"
    }
  },
  "description": "OpenSMTPD\u662f\u5b9e\u73b0\u7b80\u5355\u90ae\u4ef6\u4f20\u8f93\u534f\u8bae\u7684Unix\u5b88\u62a4\u7a0b\u5e8f\uff0c\u7528\u4e8e\u5728\u672c\u5730\u8ba1\u7b97\u673a\u4e0a\u4f20\u9012\u90ae\u4ef6\u6216\u5c06\u90ae\u4ef6\u4e2d\u7ee7\u5230\u5176\u4ed6SMTP\u670d\u52a1\u5668\u3002\n\nOpenSMTPD 6.8.0p1\u4e4b\u524d\u7248\u672c\u4e2d\u7684smtpd/lka_filter.c\u5b58\u5728\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u8fc7\u6ee4\u5668\u72b6\u6001\u673a\u672a\u80fd\u80fd\u6b63\u786e\u7ef4\u62a4SMTP\u5f15\u64ce\u548c\u8fc7\u6ee4\u5668\u5c42\u4e4b\u95f4\u7684I/O\u901a\u9053\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236\u5ba2\u6237\u7aef\u6d3b\u52a8\u6a21\u5f0f\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\uff1ahttps://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-03033",
  "openTime": "2021-01-14",
  "patchDescription": "OpenSMTPD\u662f\u5b9e\u73b0\u7b80\u5355\u90ae\u4ef6\u4f20\u8f93\u534f\u8bae\u7684Unix\u5b88\u62a4\u7a0b\u5e8f\uff0c\u7528\u4e8e\u5728\u672c\u5730\u8ba1\u7b97\u673a\u4e0a\u4f20\u9012\u90ae\u4ef6\u6216\u5c06\u90ae\u4ef6\u4e2d\u7ee7\u5230\u5176\u4ed6SMTP\u670d\u52a1\u5668\u3002\r\n\r\nOpenSMTPD 6.8.0p1\u4e4b\u524d\u7248\u672c\u4e2d\u7684smtpd/lka_filter.c\u5b58\u5728\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u8fc7\u6ee4\u5668\u72b6\u6001\u673a\u672a\u80fd\u80fd\u6b63\u786e\u7ef4\u62a4SMTP\u5f15\u64ce\u548c\u8fc7\u6ee4\u5668\u5c42\u4e4b\u95f4\u7684I/O\u901a\u9053\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236\u5ba2\u6237\u7aef\u6d3b\u52a8\u6a21\u5f0f\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": "Openbsd Opensmtpd\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Openbsd OpenSMTPD \u003c6.8.0p1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-35680",
  "serverity": "\u4e2d",
  "submitTime": "2020-12-25",
  "title": "Openbsd Opensmtpd\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e"
}

CVE-2020-35680 (GCVE-0-2020-35680)

Vulnerability from cvelistv5 – Published: 2020-12-24 15:53 – Updated: 2024-08-04 17:09

Summary

smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

6 references

URL	Tags
https://poolp.org/posts/2020-12-24/december-2020-…	x_refsource_MISC
https://www.mail-archive.com/misc%40opensmtpd.org…	x_refsource_MISC
https://github.com/openbsd/src/commit/6c3220444ed…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202105-12	vendor-advisoryx_refsource_GENTOO

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.

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.