{
  "GSD": {
    "alias": "CVE-2021-23937",
    "description": "A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions.",
    "id": "GSD-2021-23937"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "details": "A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions.",
      "id": "GSD-2021-23937",
      "modified": "2023-12-13T01:23:30.018663Z",
      "schema_version": "1.4.0"
    }
  },
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                          "version_name": "Apache Wicket 9.x",
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              "vendor_name": "Apache Software Foundation"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Apache Wicket would like to thank Jonathan Juursema from Topicus.Healthcare for reporting this issue."
        }
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          {
            "name": "[wicket-announce] 20210526 Re: CVE-2021-23937: Apache Wicket: DNS proxy and possible amplification attack",
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      "source": {
        "discovery": "UNKNOWN"
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      "work_around": [
        {
          "lang": "eng",
          "value": "Sanitize the X-Forwarded-For header by running an Apache Wicket application behind a reverse HTTP proxy. This proxy should put the client IP address in the X-Forwarded-For header and not pass through the contents of the header as received by the client."
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      ]
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          "date": "2023-08-08",
          "description": "A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket and prior versions; Apache Wicket and prior versions; Apache Wicket and prior versions and Apache Wicket versions.",
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          "package_slug": "maven/org.apache.wicket/wicket-core",
          "pubdate": "2021-05-25",
          "solution": "Upgrade to versions 6.3.0, 7.18.0, 8.12.0, 9.3.0 or above.",
          "title": "Improper Input Validation",
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          "date": "2023-08-08",
          "description": "A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket and prior versions; Apache Wicket and prior versions; Apache Wicket and prior versions and Apache Wicket versions.",
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          "title": "Improper Input Validation",
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            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
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            "version": "2.0"
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            "privilegesRequired": "NONE",
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          "impactScore": 3.6
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      },
      "lastModifiedDate": "2021-06-02T17:56Z",
      "publishedDate": "2021-05-25T17:15Z"
    }
  }
}