How the CVE Works:
CVE-2025-26336 is a stack-based buffer overflow vulnerability in Dell Chassis Management Controller (CMC) firmware affecting PowerEdge FX2 (versions < 2.40.200.202101130302) and PowerEdge VRTX (versions < 3.41.200.202209300499). The flaw occurs due to improper bounds checking when processing remote input, allowing an attacker to overwrite the stack with malicious data. By sending a specially crafted payload, an unauthenticated remote attacker can corrupt memory, alter execution flow, and achieve arbitrary code execution with elevated privileges. The vulnerability is exploitable over the network without user interaction, making it critical.
DailyCVE Form:
Platform: Dell Chassis Management Controller
Version: < 2.40.200.202101130302 (FX2), < 3.41.200.202209300499 (VRTX)
Vulnerability: Stack-based Buffer Overflow
Severity: Critical
Date: 03/27/2025
What Undercode Say:
Exploitation:
- Craft a malicious payload exceeding the buffer limit.
- Send payload via HTTP/HTTPS to CMC’s management interface.
3. Overwrite return address to redirect execution.
4. Deploy shellcode for RCE.
Protection:
1. Apply Dell firmware updates immediately.
2. Restrict network access to CMC interfaces.
3. Enable firmware integrity checks.
Analytics:
- Attack Vector: Network
- Complexity: Low
- Privileges Required: None
- User Interaction: Not needed
Commands:
- Check firmware version:
ipmitool mc info | grep "Firmware Revision"
- Exploit PoC (simulated):
import socket payload = b"A" 1024 + b"\x41\x42\x43\x44" EIP overwrite sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(("CMC_IP", 443)) sock.send(b"POST /vulnerable_endpoint HTTP/1.1\r\n" + payload)
Mitigation Code:
Block unauthorized access via iptables iptables -A INPUT -p tcp --dport 443 -s ! TRUSTED_IP -j DROP
References:
- Dell Security Advisory: DSA-2025-XXX
- CVE Details: https://nvd.nist.gov/vuln/detail/CVE-2025-26336
- Firmware Updates: Dell Support Site
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-26336
Extra Source Hub:
Undercode
