{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Piotr Bazydlo (@chudypb) of \u003ca href=\"https://www.zerodayinitiative.com/\"\u003eTrend Micro Zero Day Initiative\u003c/a\u003e"
        ]
      },
      {
        "names": [
          "\u003ca href=\"https://twitter.com/arudd1ck\"\u003eAndrew Ruddick\u003c/a\u003e with Microsoft Security Response Center"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2023-38181 Microsoft Exchange Server Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38181"
      },
      {
        "category": "self",
        "summary": "CVE-2023-38181 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/2023/msrc_cve-2023-38181.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Microsoft Exchange Server Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2023-08-15T07:00:00.000Z",
      "generator": {
        "date": "2025-01-01T01:58:31.455Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2023-38181",
      "initial_release_date": "2023-08-08T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2023-08-08T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2023-08-09T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added FAQ regarding a new known issue in the August Exchange security updates."
        },
        {
          "date": "2023-08-15T07:00:00.000Z",
          "legacy_version": "2",
          "number": "3",
          "summary": "The known issue affecting the non-English August updates of Exchange Server has been resolved.  Microsoft recommends installing the updated packages as soon as possible."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.02.1118.037",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 12 \u003c15.02.1118.037",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "15.02.1118.037",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.037",
              "product_id": "12038"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2019 Cumulative Update 12"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.01.2507.032",
            "product": {
              "name": "Microsoft Exchange Server 2016 Cumulative Update 23 \u003c15.01.2507.032",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "15.01.2507.032",
            "product": {
              "name": "Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.032",
              "product_id": "12039"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2016 Cumulative Update 23"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.02.1258.025",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 13 \u003c15.02.1258.025",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "15.02.1258.025",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1258.025",
              "product_id": "12191"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2019 Cumulative Update 13"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-38181",
      "cwe": {
        "id": "CWE-502",
        "name": "Deserialization of Untrusted Data"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An authenticated attacker could achieve exploitation by using a PowerShell remoting session to the server.",
          "title": "How could an attacker exploit this vulnerability?"
        },
        {
          "category": "faq",
          "text": "The attack vector is set to Network because this vulnerability is remotely exploitable and can be exploited from the internet.\nThe attack complexity is set to Low because an attacker does not require significant prior knowledge of the cluster/system and can achieve repeatable success when attempting to exploit this vulnerability.",
          "title": "According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Yes, an issue has been discovered with the non-English August updates of Exchange Server and you should postpone installing these updates.  The script protecting customers from the vulnerability documented by CVE-2023-21709 can be run to protect against the vulnerability without installing the August updates. Microsoft recommends running the script.\nAugust 15, 2023 Update: The known issue affecting the non-English August updates of Exchange Server has been resolved.  Microsoft recommends installing the updated packages as soon as possible.\nPlease see the Exchange Blog for more information.",
          "title": "Is there anything that I should be aware of if I\u0027m running a non-English operating system and version of Exchange server?"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could access a user\u0027s Net-NTLMv2 hash which could be used as a basis of an NTLM Relay attack against another service to authenticate as the user.",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), integrity (I:H) and availability (A:H). What does that mean for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "12038",
          "12039",
          "12191"
        ],
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2023-38181 Microsoft Exchange Server Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38181"
        },
        {
          "category": "self",
          "summary": "CVE-2023-38181 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38181"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-08-08T07:00:00.000Z",
          "details": "15.02.1118.037:Security Update:https://support.microsoft.com/help/5030524",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5030524"
        },
        {
          "category": "vendor_fix",
          "date": "2023-08-08T07:00:00.000Z",
          "details": "15.01.2507.032:Security Update:https://support.microsoft.com/help/5030524",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5030524"
        },
        {
          "category": "vendor_fix",
          "date": "2023-08-08T07:00:00.000Z",
          "details": "15.02.1258.025:Security Update:https://support.microsoft.com/help/5030524",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5030524"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.7,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft Exchange Server Spoofing Vulnerability"
    }
  ]
}