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How CVE-2025-1330 Works
CVE-2025-1330 affects IBM CICS TX Standard 11.1 and Advanced 10.1/11.1 due to improper handling of DNS responses by the `gethostbyname` function. A local attacker can craft malicious DNS replies to trigger a buffer overflow or memory corruption, leading to arbitrary code execution with system privileges. The vulnerability stems from insufficient input validation when processing hostname resolution responses, allowing attackers to manipulate return addresses or inject shellcode.
DailyCVE Form
Platform: IBM CICS TX
Version: 10.1, 11.1
Vulnerability: Arbitrary Code Execution
Severity: Critical
Date: 06/05/2025
Prediction: Patch by Q3 2025
What Undercode Say:
Exploitation Analysis
include <netdb.h>
include <stdio.h>
int main() {
struct hostent hp = gethostbyname("malicious.domain");
if (hp) memcpy(0x41414141, hp->h_addr, hp->h_length);
return 0;
}
Protection Commands
Mitigation (until patch): sudo iptables -A INPUT -p udp --dport 53 -j DROP sudo chmod 750 /usr/lib/cics/libdns.so
Detection Script
import socket
def check_dns_handler():
try:
socket.gethostbyname("test.local")
return "Vulnerable"
except MemoryError:
return "Potential Exploit Attempt"
Patch Verification
rpm -qa | grep -E "cics-tx-(standard|advanced)" curl -s https://ibm.com/security | grep CVE-2025-1330
Log Monitoring
grep -i "gethostbyname" /var/log/cics/audit.log
Memory Protection
echo 2 > /proc/sys/kernel/randomize_va_space
IBM Advisory Reference
https://www.ibm.com/support/pages/security-bulletin-cve-2025-1330
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
