Vulnerability-Lookup

CNVD-2020-34994

Vulnerability from cnvd - Published: 2020-06-29

Title

Exim缓冲区溢出漏洞（CNVD-2020-34994）

Description

Exim是一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.93及之前版本中的SPA authenticator存在缓冲区溢出漏洞。攻击者可利用该漏洞绕过身份验证。

Severity

中

Patch Name

Exim缓冲区溢出漏洞（CNVD-2020-34994）的补丁

Patch Description

Exim是一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.93及之前版本中的SPA authenticator存在缓冲区溢出漏洞。攻击者可利用该漏洞绕过身份验证。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://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-12783

Impacted products

Name
Exim Exim <=4.93

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-12783"
    }
  },
  "description": "Exim\u662f\u4e00\u4e2a\u8fd0\u884c\u4e8eUnix\u7cfb\u7edf\u4e2d\u7684\u5f00\u6e90\u6d88\u606f\u4f20\u9001\u4ee3\u7406\uff08MTA\uff09\uff0c\u5b83\u4e3b\u8981\u8d1f\u8d23\u90ae\u4ef6\u7684\u8def\u7531\u3001\u8f6c\u53d1\u548c\u6295\u9012\u3002\n\nExim 4.93\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u7684SPA authenticator\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\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\uff1a\r\nhttps://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-34994",
  "openTime": "2020-06-29",
  "patchDescription": "Exim\u662f\u4e00\u4e2a\u8fd0\u884c\u4e8eUnix\u7cfb\u7edf\u4e2d\u7684\u5f00\u6e90\u6d88\u606f\u4f20\u9001\u4ee3\u7406\uff08MTA\uff09\uff0c\u5b83\u4e3b\u8981\u8d1f\u8d23\u90ae\u4ef6\u7684\u8def\u7531\u3001\u8f6c\u53d1\u548c\u6295\u9012\u3002\r\n\r\nExim 4.93\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u7684SPA authenticator\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\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": "Exim\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2020-34994\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Exim Exim \u003c=4.93"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-12783",
  "serverity": "\u4e2d",
  "submitTime": "2020-05-12",
  "title": "Exim\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2020-34994\uff09"
}

CVE-2020-12783 (GCVE-0-2020-12783)

Vulnerability from cvelistv5 – Published: 2020-05-11 13:51 – Updated: 2024-08-04 12:04

Summary

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

9 references

URL	Tags
https://bugs.exim.org/show_bug.cgi?id=2571	x_refsource_CONFIRM
https://git.exim.org/exim.git/commit/57aa14b21643…	x_refsource_CONFIRM
https://git.exim.org/exim.git/commit/a04174dc2a84…	x_refsource_CONFIRM
https://www.debian.org/security/2020/dsa-4687	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
https://usn.ubuntu.com/4366-1/	vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/05/04/7	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

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            "url": "https://bugs.exim.org/show_bug.cgi?id=2571"
          },
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            "url": "https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0"
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            "name": "DSA-4687",
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            "url": "https://www.debian.org/security/2020/dsa-4687"
          },
          {
            "name": "[debian-lts-announce] 20200518 [SECURITY] [DLA 2213-1] exim4 security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00017.html"
          },
          {
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            "url": "https://usn.ubuntu.com/4366-1/"
          },
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            "name": "FEDORA-2020-93d7305d71",
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          },
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          },
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            "name": "[oss-security] 20210504 21Nails: Multiple vulnerabilities in Exim",
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        },
        {
          "name": "[oss-security] 20210504 21Nails: Multiple vulnerabilities in Exim",
          "tags": [
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            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/05/04/7"
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    "datePublished": "2020-05-11T13:51:54.000Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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Action not permitted

CNVD-2020-34994

CVE-2020-12783 (GCVE-0-2020-12783)

Tags

Sightings

Nomenclature

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