gsd-2021-29431
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.
Aliases
Aliases
CVE-2021-29431


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-29431",
    "description": "Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.",
    "id": "GSD-2021-29431"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-29431"
      ],
      "details": "Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.",
      "id": "GSD-2021-29431",
      "modified": "2023-12-13T01:23:36.443618Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-29431",
        "STATE": "PUBLIC",
        "TITLE": "SSRF in Sydent due to missing validation of hostnames"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "sydent",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "\u003c 2.3.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "matrix-org"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "{\"CWE-20\":\"Improper Input Validation\"}"
              }
            ]
          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-918 Server-Side Request Forgery (SSRF)"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://pypi.org/project/matrix-sydent/",
            "refsource": "MISC",
            "url": "https://pypi.org/project/matrix-sydent/"
          },
          {
            "name": "https://github.com/matrix-org/sydent/releases/tag/v2.3.0",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/sydent/releases/tag/v2.3.0"
          },
          {
            "name": "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4",
            "refsource": "CONFIRM",
            "url": "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4"
          },
          {
            "name": "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f"
          },
          {
            "name": "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a"
          },
          {
            "name": "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3"
          },
          {
            "name": "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-9jhm-8m8c-c3f4",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c2.3.0",
          "affected_versions": "All versions before 2.3.0",
          "cvss_v2": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-20",
            "CWE-918",
            "CWE-937"
          ],
          "date": "2021-04-19",
          "description": "Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address block listing. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.",
          "fixed_versions": [
            "2.3.0"
          ],
          "identifier": "CVE-2021-29431",
          "identifiers": [
            "GHSA-9jhm-8m8c-c3f4",
            "CVE-2021-29431"
          ],
          "not_impacted": "All versions starting from 2.3.0",
          "package_slug": "pypi/matrix-sydent",
          "pubdate": "2021-04-19",
          "solution": "Upgrade to version 2.3.0 or above.",
          "title": "Server-Side Request Forgery (SSRF)",
          "urls": [
            "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4",
            "https://pypi.org/project/matrix-sydent/",
            "https://nvd.nist.gov/vuln/detail/CVE-2021-29431",
            "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a",
            "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3",
            "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a",
            "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f",
            "https://github.com/matrix-org/sydent/releases/tag/v2.3.0",
            "https://github.com/advisories/GHSA-9jhm-8m8c-c3f4"
          ],
          "uuid": "1a02a3d0-7bfa-4615-83a5-1587ed4a584e"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2.3.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-29431"
        },
        "data_format": "MITRE",
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        "data_version": "4.0",
        "description": {
          "description_data": [
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              "lang": "en",
              "value": "Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-20"
                },
                {
                  "lang": "en",
                  "value": "CWE-918"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
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              "url": "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3"
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              "name": "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a",
              "refsource": "MISC",
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              "url": "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a"
            },
            {
              "name": "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4",
              "refsource": "CONFIRM",
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                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4"
            },
            {
              "name": "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f"
            },
            {
              "name": "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
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              "url": "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a"
            },
            {
              "name": "https://pypi.org/project/matrix-sydent/",
              "refsource": "MISC",
              "tags": [
                "Product",
                "Third Party Advisory"
              ],
              "url": "https://pypi.org/project/matrix-sydent/"
            },
            {
              "name": "https://github.com/matrix-org/sydent/releases/tag/v2.3.0",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Third Party Advisory"
              ],
              "url": "https://github.com/matrix-org/sydent/releases/tag/v2.3.0"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "NONE",
            "baseScore": 4.0,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-04-22T15:27Z",
      "publishedDate": "2021-04-15T21:15Z"
    }
  }
}


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