cnvd - cnvd-2018-04619

cnvd-2018-04619

Vulnerability from cnvd

Title: Exim SMTP Mail Server缓冲区溢出漏洞

Description:

Exim是一个MTA（Mail Transfer Agent，邮件传输代理）服务器软件，该软件基于GPL协议开发，是一款开源软件。该软件主要运行于类UNIX系统。通常该软件会与Dovecot或Courier等软件搭配使用。

Exim 4.90.1之前版本中的SMTPSMTP侦听器'base64d()'解码函数在发送handcrafted消息时存在缓冲区溢出漏洞，攻击者可利用该漏洞在受影响的应用程序上下文中执行任意代码，若攻击尝试失败仍可导致拒绝服务条件。

Severity: 高

Patch Name: Exim SMTP Mail Server缓冲区溢出漏洞的补丁

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 4.90.1之前版本中的SMTP侦听器'base64d()'解码函数在发送handcrafted消息时存在缓冲区溢出漏洞，攻击者可利用该漏洞在受影响的应用程序上下文中执行任意代码，若攻击尝试失败仍可导致拒绝服务条件。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:

目前厂商已经发布了升级补丁以修复此安全问题，补丁获取链接： https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/

Reference: https://nvd.nist.gov/vuln/detail/CVE-2018-6789

Impacted products

Name
Exim Exim <4.90.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-6789"
    }
  },
  "description": "Exim\u662f\u4e00\u4e2aMTA\uff08Mail Transfer Agent\uff0c\u90ae\u4ef6\u4f20\u8f93\u4ee3\u7406\uff09\u670d\u52a1\u5668\u8f6f\u4ef6\uff0c\u8be5\u8f6f\u4ef6\u57fa\u4e8eGPL\u534f\u8bae\u5f00\u53d1\uff0c\u662f\u4e00\u6b3e\u5f00\u6e90\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u4e3b\u8981\u8fd0\u884c\u4e8e\u7c7bUNIX\u7cfb\u7edf\u3002\u901a\u5e38\u8be5\u8f6f\u4ef6\u4f1a\u4e0eDovecot\u6216Courier\u7b49\u8f6f\u4ef6\u642d\u914d\u4f7f\u7528\u3002\r\n\r\nExim 4.90.1\u4e4b\u524d\u7248\u672c\u4e2d\u7684SMTPSMTP\u4fa6\u542c\u5668\u0027base64d()\u0027\u89e3\u7801\u51fd\u6570\u5728\u53d1\u9001handcrafted\u6d88\u606f\u65f6\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u53d7\u5f71\u54cd\u7684\u5e94\u7528\u7a0b\u5e8f\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\u4efb\u610f\u4ee3\u7801\uff0c\u82e5\u653b\u51fb\u5c1d\u8bd5\u5931\u8d25\u4ecd\u53ef\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u6761\u4ef6\u3002",
  "discovererName": "Meh Chang",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u7ecf\u53d1\u5e03\u4e86\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6b64\u5b89\u5168\u95ee\u9898\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a \r\nhttps://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-04619",
  "openTime": "2018-03-08",
  "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 4.90.1\u4e4b\u524d\u7248\u672c\u4e2d\u7684SMTP\u4fa6\u542c\u5668\u0027base64d()\u0027\u89e3\u7801\u51fd\u6570\u5728\u53d1\u9001handcrafted\u6d88\u606f\u65f6\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u53d7\u5f71\u54cd\u7684\u5e94\u7528\u7a0b\u5e8f\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\u4efb\u610f\u4ee3\u7801\uff0c\u82e5\u653b\u51fb\u5c1d\u8bd5\u5931\u8d25\u4ecd\u53ef\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u6761\u4ef6\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 SMTP Mail Server\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Exim Exim \u003c4.90.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2018-6789",
  "serverity": "\u9ad8",
  "submitTime": "2018-02-09",
  "title": "Exim SMTP Mail Server\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e"
}

CVE-2018-6789 (GCVE-0-2018-6789)

Vulnerability from cvelistv5

Published

2018-02-08 23:00

Modified

2025-07-30 01:46

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

Summary

An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

References

▼	URL	Tags
	https://exim.org/static/doc/security/CVE-2018-6789.txt	x_refsource_CONFIRM
	http://www.openwall.com/lists/oss-security/2018/02/07/2	mailing-list, x_refsource_MLIST
	https://usn.ubuntu.com/3565-1/	vendor-advisory, x_refsource_UBUNTU
	http://openwall.com/lists/oss-security/2018/02/10/2	x_refsource_CONFIRM
	http://www.securitytracker.com/id/1040461	vdb-entry, x_refsource_SECTRACK
	https://www.debian.org/security/2018/dsa-4110	vendor-advisory, x_refsource_DEBIAN
	https://www.exploit-db.com/exploits/44571/	exploit, x_refsource_EXPLOIT-DB
	https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html	mailing-list, x_refsource_MLIST
	https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1	x_refsource_CONFIRM
	https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/	x_refsource_MISC
	http://www.securityfocus.com/bid/103049	vdb-entry, x_refsource_BID
	https://www.exploit-db.com/exploits/45671/	exploit, x_refsource_EXPLOIT-DB
	http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html	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": "2024-08-05T06:10:11.343Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
          },
          {
            "name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
          },
          {
            "name": "USN-3565-1",
            "tags": [
              "vendor-advisory",
              "x_refsource_UBUNTU",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/3565-1/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "http://openwall.com/lists/oss-security/2018/02/10/2"
          },
          {
            "name": "1040461",
            "tags": [
              "vdb-entry",
              "x_refsource_SECTRACK",
              "x_transferred"
            ],
            "url": "http://www.securitytracker.com/id/1040461"
          },
          {
            "name": "DSA-4110",
            "tags": [
              "vendor-advisory",
              "x_refsource_DEBIAN",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2018/dsa-4110"
          },
          {
            "name": "44571",
            "tags": [
              "exploit",
              "x_refsource_EXPLOIT-DB",
              "x_transferred"
            ],
            "url": "https://www.exploit-db.com/exploits/44571/"
          },
          {
            "name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
          },
          {
            "name": "103049",
            "tags": [
              "vdb-entry",
              "x_refsource_BID",
              "x_transferred"
            ],
            "url": "http://www.securityfocus.com/bid/103049"
          },
          {
            "name": "45671",
            "tags": [
              "exploit",
              "x_refsource_EXPLOIT-DB",
              "x_transferred"
            ],
            "url": "https://www.exploit-db.com/exploits/45671/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2018-6789",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-07T14:03:40.827397Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2021-11-03",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-120",
                "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-07-30T01:46:19.343Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "timeline": [
          {
            "lang": "en",
            "time": "2021-11-03T00:00:00+00:00",
            "value": "CVE-2018-6789 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2018-02-07T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-06-03T17:06:14.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
        },
        {
          "name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
        },
        {
          "name": "USN-3565-1",
          "tags": [
            "vendor-advisory",
            "x_refsource_UBUNTU"
          ],
          "url": "https://usn.ubuntu.com/3565-1/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "http://openwall.com/lists/oss-security/2018/02/10/2"
        },
        {
          "name": "1040461",
          "tags": [
            "vdb-entry",
            "x_refsource_SECTRACK"
          ],
          "url": "http://www.securitytracker.com/id/1040461"
        },
        {
          "name": "DSA-4110",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2018/dsa-4110"
        },
        {
          "name": "44571",
          "tags": [
            "exploit",
            "x_refsource_EXPLOIT-DB"
          ],
          "url": "https://www.exploit-db.com/exploits/44571/"
        },
        {
          "name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
        },
        {
          "name": "103049",
          "tags": [
            "vdb-entry",
            "x_refsource_BID"
          ],
          "url": "http://www.securityfocus.com/bid/103049"
        },
        {
          "name": "45671",
          "tags": [
            "exploit",
            "x_refsource_EXPLOIT-DB"
          ],
          "url": "https://www.exploit-db.com/exploits/45671/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2018-6789",
          "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": "An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://exim.org/static/doc/security/CVE-2018-6789.txt",
              "refsource": "CONFIRM",
              "url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
            },
            {
              "name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
            },
            {
              "name": "USN-3565-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/3565-1/"
            },
            {
              "name": "http://openwall.com/lists/oss-security/2018/02/10/2",
              "refsource": "CONFIRM",
              "url": "http://openwall.com/lists/oss-security/2018/02/10/2"
            },
            {
              "name": "1040461",
              "refsource": "SECTRACK",
              "url": "http://www.securitytracker.com/id/1040461"
            },
            {
              "name": "DSA-4110",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2018/dsa-4110"
            },
            {
              "name": "44571",
              "refsource": "EXPLOIT-DB",
              "url": "https://www.exploit-db.com/exploits/44571/"
            },
            {
              "name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
            },
            {
              "name": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1",
              "refsource": "CONFIRM",
              "url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
            },
            {
              "name": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
              "refsource": "MISC",
              "url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
            },
            {
              "name": "103049",
              "refsource": "BID",
              "url": "http://www.securityfocus.com/bid/103049"
            },
            {
              "name": "45671",
              "refsource": "EXPLOIT-DB",
              "url": "https://www.exploit-db.com/exploits/45671/"
            },
            {
              "name": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html",
              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2018-6789",
    "datePublished": "2018-02-08T23:00:00.000Z",
    "dateReserved": "2018-02-06T00:00:00.000Z",
    "dateUpdated": "2025-07-30T01:46:19.343Z",
    "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.

Action not permitted