gsd-2023-28857
Vulnerability from gsd
Modified
2023-12-13 01:20
Details
Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as “ssl_client_cert”. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the “CRL Distribution Points” extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a “cas.authn.x509.ldap.ldap-url” and “cas.authn.x509.ldap.bind-credential” properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Aliases
Aliases
CVE-2023-28857


To clipboard 

{
  "GSD": {
    "alias": "CVE-2023-28857",
    "id": "GSD-2023-28857"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-28857"
      ],
      "details": "Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as \u201cssl_client_cert\u201d. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the \u201cCRL Distribution Points\u201d extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a \u201ccas.authn.x509.ldap.ldap-url\u201d and \u201ccas.authn.x509.ldap.bind-credential\u201d properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.",
      "id": "GSD-2023-28857",
      "modified": "2023-12-13T01:20:47.930879Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2023-28857",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "CAS",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "\u003e= 6.5.0, \u003c 6.5.9.1"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "\u003e= 6.6.0, \u003c 6.6.6"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Apereo"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as \u201cssl_client_cert\u201d. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the \u201cCRL Distribution Points\u201d extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a \u201ccas.authn.x509.ldap.ldap-url\u201d and \u201ccas.authn.x509.ldap.bind-credential\u201d properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability."
          }
        ]
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-200",
                "lang": "eng",
                "value": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/",
            "refsource": "MISC",
            "url": "https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/"
          },
          {
            "name": "https://apereo.github.io/2023/02/20/x509-vuln/",
            "refsource": "MISC",
            "url": "https://apereo.github.io/2023/02/20/x509-vuln/"
          },
          {
            "name": "https://github.com/apereo/cas/releases/tag/v6.6.6",
            "refsource": "MISC",
            "url": "https://github.com/apereo/cas/releases/tag/v6.6.6"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-p78h-m8pv-g9gm",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "[6.5.0,6.5.9.1),[6.6.0,6.6.6)",
          "affected_versions": "All versions starting from 6.5.0 before 6.5.9.1, all versions starting from 6.6.0 before 6.6.6",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-522",
            "CWE-937"
          ],
          "date": "2023-07-06",
          "description": "Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as \u201cssl_client_cert\u201d. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the \u201cCRL Distribution Points\u201d extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a \u201ccas.authn.x509.ldap.ldap-url\u201d and \u201ccas.authn.x509.ldap.bind-credential\u201d properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.",
          "fixed_versions": [
            "6.5.9.1",
            "6.6.6"
          ],
          "identifier": "CVE-2023-28857",
          "identifiers": [
            "CVE-2023-28857"
          ],
          "not_impacted": "All versions before 6.5.0, all versions starting from 6.5.9.1 before 6.6.0, all versions starting from 6.6.6",
          "package_slug": "maven/org.apereo.cas/cas-server-core-services-authentication",
          "pubdate": "2023-06-27",
          "solution": "Upgrade to versions 6.5.9.1, 6.6.6 or above.",
          "title": "Insufficiently Protected Credentials",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2023-28857",
            "https://github.com/apereo/cas/releases/tag/v6.6.6",
            "https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/",
            "https://apereo.github.io/2023/02/20/x509-vuln/"
          ],
          "uuid": "10735a6e-6fe7-490a-a47b-31a68237ef3d"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "6.6.6",
                "versionStartIncluding": "6.6.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "6.5.9.1",
                "versionStartIncluding": "6.5.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2023-28857"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Apereo CAS is an open source multilingual single sign-on solution for the web. Apereo CAS can be configured to use authentication based on client X509 certificates. These certificates can be provided via TLS handshake or a special HTTP header, such as \u201cssl_client_cert\u201d. When checking the validity of the provided client certificate, X509CredentialsAuthenticationHandler performs check that this certificate is not revoked. To do so, it fetches URLs provided in the \u201cCRL Distribution Points\u201d extension of the certificate, which are taken from the certificate itself and therefore can be controlled by a malicious user. If the CAS server is configured to use an LDAP server for x509 authentication with a password, for example by setting a \u201ccas.authn.x509.ldap.ldap-url\u201d and \u201ccas.authn.x509.ldap.bind-credential\u201d properties, X509CredentialsAuthenticationHandler fetches revocation URLs from the certificate, which can be LDAP urls. When making requests to this LDAP urls, Apereo CAS uses the same password as for initially configured LDAP server, which can lead to a password leak. An unauthenticated user can leak the password used to LDAP connection configured on server. This issue has been addressed in version 6.6.6. Users are advised to upgrade. There are no known workarounds for this vulnerability."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-522"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/apereo/cas/releases/tag/v6.6.6",
              "refsource": "MISC",
              "tags": [
                "Release Notes"
              ],
              "url": "https://github.com/apereo/cas/releases/tag/v6.6.6"
            },
            {
              "name": "https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS/"
            },
            {
              "name": "https://apereo.github.io/2023/02/20/x509-vuln/",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://apereo.github.io/2023/02/20/x509-vuln/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-07-06T18:11Z",
      "publishedDate": "2023-06-27T18:15Z"
    }
  }
}


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