CVE-2023-38545 (GCVE-0-2023-38545)
Vulnerability from cvelistv5
Published
2023-10-18 03:52
Modified
2025-08-27 20:32
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.
References
Impacted products
Vendor Product Version
curl curl Version: 8.4.0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T17:46:56.235Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://curl.se/docs/CVE-2023-38545.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20231027-0009/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214036"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214063"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214057"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214058"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20240201-0005/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-38545",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-17T21:11:03.346985Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-08-27T20:32:53.710Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/bcdannyboy/CVE-2023-38545"
          },
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/dbrugman/CVE-2023-38545-POC"
          },
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/UTsweetyfish/CVE-2023-38545"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "8.4.0",
              "status": "affected",
              "version": "8.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.69.0",
              "status": "unaffected",
              "version": "7.69.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy\nhandshake.\n\nWhen curl is asked to pass along the host name to the SOCKS5 proxy to allow\nthat to resolve the address instead of it getting done by curl itself, the\nmaximum length that host name can be is 255 bytes.\n\nIf the host name is detected to be longer, curl switches to local name\nresolving and instead passes on the resolved address only. Due to this bug,\nthe local variable that means \"let the host resolve the name\" could get the\nwrong value during a slow SOCKS5 handshake, and contrary to the intention,\ncopy the too long host name to the target buffer instead of copying just the\nresolved address there.\n\nThe target buffer being a heap based buffer, and the host name coming from the\nURL that curl has been told to operate with."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-07-09T13:27:08.128Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2023-38545.html"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20231027-0009/"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
        },
        {
          "url": "https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/"
        },
        {
          "url": "https://support.apple.com/kb/HT214036"
        },
        {
          "url": "https://support.apple.com/kb/HT214063"
        },
        {
          "url": "https://support.apple.com/kb/HT214057"
        },
        {
          "url": "https://support.apple.com/kb/HT214058"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20240201-0005/"
        },
        {
          "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2023-38545",
    "datePublished": "2023-10-18T03:52:00.816Z",
    "dateReserved": "2023-07-20T01:00:12.444Z",
    "dateUpdated": "2025-08-27T20:32:53.710Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://curl.se/docs/CVE-2023-38545.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20231027-0009/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://support.apple.com/kb/HT214036\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://support.apple.com/kb/HT214063\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://support.apple.com/kb/HT214057\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://support.apple.com/kb/HT214058\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/34\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/37\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/38\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240201-0005/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T17:46:56.235Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-38545\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-17T21:11:03.346985Z\"}}}], \"references\": [{\"url\": \"https://github.com/bcdannyboy/CVE-2023-38545\", \"tags\": [\"exploit\"]}, {\"url\": \"https://github.com/dbrugman/CVE-2023-38545-POC\", \"tags\": [\"exploit\"]}, {\"url\": \"https://github.com/UTsweetyfish/CVE-2023-38545\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-17T21:13:14.040Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.4.0\", \"lessThan\": \"8.4.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"7.69.0\", \"lessThan\": \"7.69.0\", \"versionType\": \"semver\"}]}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2023-38545.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20231027-0009/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/\"}, {\"url\": \"https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/\"}, {\"url\": \"https://support.apple.com/kb/HT214036\"}, {\"url\": \"https://support.apple.com/kb/HT214063\"}, {\"url\": \"https://support.apple.com/kb/HT214057\"}, {\"url\": \"https://support.apple.com/kb/HT214058\"}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/34\"}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/37\"}, {\"url\": \"http://seclists.org/fulldisclosure/2024/Jan/38\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240201-0005/\"}, {\"url\": \"https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy\\nhandshake.\\n\\nWhen curl is asked to pass along the host name to the SOCKS5 proxy to allow\\nthat to resolve the address instead of it getting done by curl itself, the\\nmaximum length that host name can be is 255 bytes.\\n\\nIf the host name is detected to be longer, curl switches to local name\\nresolving and instead passes on the resolved address only. Due to this bug,\\nthe local variable that means \\\"let the host resolve the name\\\" could get the\\nwrong value during a slow SOCKS5 handshake, and contrary to the intention,\\ncopy the too long host name to the target buffer instead of copying just the\\nresolved address there.\\n\\nThe target buffer being a heap based buffer, and the host name coming from the\\nURL that curl has been told to operate with.\"}], \"providerMetadata\": {\"orgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"shortName\": \"hackerone\", \"dateUpdated\": \"2024-07-09T13:27:08.128Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-38545\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-08-27T20:32:53.710Z\", \"dateReserved\": \"2023-07-20T01:00:12.444Z\", \"assignerOrgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"datePublished\": \"2023-10-18T03:52:00.816Z\", \"assignerShortName\": \"hackerone\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.