cnvd - cnvd-2021-34532

cnvd-2021-34532

Vulnerability from cnvd

Title: Exim缓冲区溢出漏洞（CNVD-2021-34532）

Description:

Exim是在剑桥大学开发的消息传输代理（MTA），用于连接到互联网的Unix系统。

Exim中的parse_fix_phrase()存在堆缓冲区溢出漏洞，该漏洞源于在strncpy中解释了负数大小，攻击者可利用该漏洞将权限从任何用户提升到root权限。

Severity: 高

Patch Name: Exim缓冲区溢出漏洞（CNVD-2021-34532）的补丁

Patch Description:

Exim是在剑桥大学开发的消息传输代理（MTA），用于连接到互联网的Unix系统。

Exim中的parse_fix_phrase()存在堆缓冲区溢出漏洞，该漏洞源于在strncpy中解释了负数大小，攻击者可利用该漏洞将权限从任何用户提升到root权限。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： https://www.exim.org/

Reference: https://nvd.nist.gov/vuln/detail/CVE-2020-28013

Impacted products

Name
Exim Exim <4.94.2

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-28013",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-28013"
    }
  },
  "description": "Exim\u662f\u5728\u5251\u6865\u5927\u5b66\u5f00\u53d1\u7684\u6d88\u606f\u4f20\u8f93\u4ee3\u7406\uff08MTA\uff09\uff0c\u7528\u4e8e\u8fde\u63a5\u5230\u4e92\u8054\u7f51\u7684Unix\u7cfb\u7edf\u3002\n\nExim\u4e2d\u7684parse_fix_phrase()\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728strncpy\u4e2d\u89e3\u91ca\u4e86\u8d1f\u6570\u5927\u5c0f\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06\u6743\u9650\u4ece\u4efb\u4f55\u7528\u6237\u63d0\u5347\u5230root\u6743\u9650\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.exim.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-34532",
  "openTime": "2021-05-14",
  "patchDescription": "Exim\u662f\u5728\u5251\u6865\u5927\u5b66\u5f00\u53d1\u7684\u6d88\u606f\u4f20\u8f93\u4ee3\u7406\uff08MTA\uff09\uff0c\u7528\u4e8e\u8fde\u63a5\u5230\u4e92\u8054\u7f51\u7684Unix\u7cfb\u7edf\u3002\r\n\r\nExim\u4e2d\u7684parse_fix_phrase()\u5b58\u5728\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728strncpy\u4e2d\u89e3\u91ca\u4e86\u8d1f\u6570\u5927\u5c0f\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06\u6743\u9650\u4ece\u4efb\u4f55\u7528\u6237\u63d0\u5347\u5230root\u6743\u9650\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-2021-34532\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Exim Exim \u003c4.94.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-28013",
  "serverity": "\u9ad8",
  "submitTime": "2021-05-10",
  "title": "Exim\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2021-34532\uff09"
}

CVE-2020-28013 (GCVE-0-2020-28013)

Vulnerability from cvelistv5

Published

2021-05-06 03:39

Modified

2024-08-04 16:25

Severity ?

CWE

Summary

Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.

References

▼	URL	Tags
	https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28013-PFPSN.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T16:25:43.971Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28013-PFPSN.txt"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles \"-F \u0027.(\u0027\" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-05-06T03:39:35",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28013-PFPSN.txt"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2020-28013",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles \"-F \u0027.(\u0027\" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28013-PFPSN.txt",
              "refsource": "MISC",
              "url": "https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28013-PFPSN.txt"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-28013",
    "datePublished": "2021-05-06T03:39:35",
    "dateReserved": "2020-10-30T00:00:00",
    "dateUpdated": "2024-08-04T16:25:43.971Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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