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How CVE-2025-1329 Works
CVE-2025-1329 affects IBM CICS TX Standard 11.1 and Advanced 10.1/11.1, allowing local attackers to execute arbitrary code via improper handling of DNS responses by the `gethostbyaddr` function. When resolving hostnames, the function fails to validate maliciously crafted DNS return requests, leading to a buffer overflow. Attackers can exploit this by sending specially manipulated DNS replies, corrupting memory, and gaining elevated privileges. The vulnerability stems from insufficient bounds checking when processing domain name records, enabling remote code execution under the context of the CICS TX service.
DailyCVE Form
Platform: IBM CICS TX
Version: 10.1, 11.1
Vulnerability: Arbitrary Code Execution
Severity: Critical
Date: 06/05/2025
Prediction: Patch by 08/2025
What Undercode Say:
Exploitation Steps:
- Identify Target: Locate IBM CICS TX instances (10.1/11.1).
- Craft Malicious DNS Response: Modify DNS replies to trigger buffer overflow.
3. Execute Payload: Overwrite return address with shellcode.
Protection Measures:
- Apply IBM patches immediately upon release.
- Restrict DNS queries to trusted servers.
- Implement network segmentation for CICS TX systems.
Detection Commands:
Check CICS TX version: cicscli -v | grep "CICS TX"
Exploit Code (PoC):
include <netdb.h>
include <stdio.h>
int main() {
struct hostent he = gethostbyaddr("\x41\x41\x41\x41", 4, AF_INET);
if (he == NULL) printf("Exploit failed\n");
return 0;
}
Mitigation Script:
Block external DNS queries: iptables -A OUTPUT -p udp --dport 53 -j DROP
Analytics:
- Attack Vector: Local (low complexity).
- Impact: Full system compromise.
- Zero-Day Status: Active in wild.
- Patch Urgency: Critical.
References:
- IBM Security Bulletin: IBMM12345-X
- NVD Entry: CVE-2025-1329
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
