Karp Linux Kernel Level Arp Hijacking Spoofing Utility

by operating directly within the kernel's network stack. Unlike user-space tools that rely on libraries like , kArp functions as a Kernel Module (LKM)

echo "inject tcp dport 80 payload 'EVIL_HTML_BASE64'" > /proc/karp/payloads kArp Linux Kernel Level ARP Hijacking Spoofing Utility

| Defense | Effective? | Notes | |---------|------------|-------| | Static ARP tables | ✅ Yes | Prevents any ARP cache poisoning | | arp_filter / arp_ignore sysctls | ✅ Partially | Hardens Linux hosts | | DAI on managed switches | ✅ Yes | Switch drops invalid ARP | | 802.1X + port security | ✅ Yes | Prevents module load on endpoint | | LSM (SELinux) blocking insmod | ✅ Yes | Kernel module loading restricted | by operating directly within the kernel's network stack

lsmod | grep -v "^Module" | awk 'print $1' | xargs modinfo | grep -i "karp" But they are slow, detectable, and clunky

# List all Netfilter hooks (requires root) cat /proc/net/netfilter/nf_hooks | grep -B2 karp

kArp registers two Netfilter hooks:

In the pantheon of network attack tools, few are as misunderstood—or as devastating—as ARP spoofing. For decades, utilities like arpspoof (dsniff suite), Ettercap , and BetterCAP have dominated the red team landscape. They operate in user space, crafting and injecting raw packets with millisecond delays. They work. But they are slow, detectable, and clunky.