How the CVE Works:
CVE-2025-22904 is a critical stack-based buffer overflow vulnerability in RE11S firmware v1.11, specifically in the `setWAN` function. The flaw occurs due to improper bounds checking when processing the `pptpUserName` parameter. An attacker can exploit this by sending an overly long string, overwriting the return address on the stack and executing arbitrary code with elevated privileges. The lack of input validation allows remote attackers to gain control over the device, potentially leading to a full system compromise.
DailyCVE Form:
Platform: RE11S Router
Version: v1.11
Vulnerability: Stack Overflow
Severity: Critical
Date: 04/09/2025
What Undercode Say:
Exploitation:
1. Payload Crafting:
payload = "A" 1024 + "\xde\xad\xbe\xef" Overflow + return address
2. Trigger via HTTP Request:
curl -X POST -d "pptpUserName=$payload" http://target/router.cgi
Detection & Mitigation:
1. Check Firmware Version:
grep "FW_VERSION" /etc/config
2. Patch Application:
wget https://vendor.com/patches/CVE-2025-22904.bin flash-firmware CVE-2025-22904.bin
Protection Commands:
1. Disable PPTP Temporarily:
iptables -A INPUT -p tcp --dport 1723 -j DROP
2. Stack Protection (Compiler Flag):
gcc -fstack-protector-strong -o setWAN setWAN.c
Debugging:
1. Crash Analysis (GDB):
gdb ./setWAN -ex "run $(python -c 'print \"A\"1024')"
2. Log Monitoring:
tail -f /var/log/messages | grep "segfault"
References:
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-22904
Extra Source Hub:
Undercode
