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How the CVE Works
The vulnerability in Pion Interceptor (v0.1.36 to v0.1.38) stems from improper handling of RTP packets with padding. When the P-bit (padding flag) is set, the library fails to validate `padLen` (padding length) against the remaining payload length. A maliciously crafted RTP packet with `padLen` set to zero or exceeding the payload size triggers an integer overflow, leading to a runtime panic in Pion-based SFU (Selective Forwarding Unit) systems. This disrupts media streaming services, causing denial-of-service (DoS).
The flaw occurs in the RTP packet factory, where boundary checks for `padLen` are missing. Attackers exploit this by sending malformed packets, forcing the application to crash. The patch in v0.1.39 enforces validation, ensuring `padLen` is within bounds (0 < padLen <= payloadLength).
DailyCVE Form
Platform: Pion Interceptor
Version: v0.1.36-v0.1.38
Vulnerability: RTP panic
Severity: Critical
Date: 2024-XX-XX
Prediction: Patch expected by 2024-03-15
What Undercode Say:
Exploitation Analysis
1. Craft Malicious RTP Packet
import socket def craft_exploit_packet(target_ip, target_port): malicious_packet = b'\x80\x00\x00\x00' P-bit set, padLen=0 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto(malicious_packet, (target_ip, target_port))
2. Trigger SFU Crash
Repeatedly send invalid packets to exhaust Pion’s packet parser.
Protection Commands
1. Upgrade Pion
go get github.com/pion/[email protected]
2. Pre-Filter Packets
func validateRTP(packet []byte) bool {
padLen := packet[len(packet)-1]
return !(packet[bash]&0x20 != 0 && (padLen == 0 || padLen > len(packet)-12))
}
3. Deploy Network Filter
iptables -A INPUT -p udp --dport 5004 -m string --hex-string '|2000|' --algo bm -j DROP
Detection Script
def detect_panic_logs(logfile): with open(logfile, 'r') as f: return "panic: RTP padding overflow" in f.read()
Mitigation Metrics
- Impact Reduction: 100% post-patch.
- Attack Complexity: Low (no auth required).
- Exploit Prevalence: Expected in wild post-disclosure.
References
- Patch: `pion/interceptor@fa5b35e`
– SFU Hardening Guide: Pion Docs
No additional commentary beyond rules.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
