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How the CVE Works:
The vulnerability (CVE-2025-XXXXX) in GoBGP before version 3.35.0 arises due to improper handling of the `softwareVersionLen` field in pkg/packet/bgp/bgp.go. When an attacker sends a malicious BGP message with `softwareVersionLen` set to zero, the GoBGP process fails to validate the input, leading to a null pointer dereference. This triggers a runtime panic, crashing the BGP daemon and causing a denial of service. The flaw stems from missing boundary checks when parsing BGP capabilities in the OPEN message, allowing unauthenticated remote attackers to disrupt routing operations.
DailyCVE Form:
Platform: GoBGP
Version: < 3.35.0
Vulnerability: Null pointer dereference
Severity: High
Date: Apr 21, 2025
What Undercode Say:
Analytics:
- Affects GoBGP instances exposed to untrusted BGP peers.
- Exploitable via crafted BGP OPEN messages.
- Mitigation requires patching or network-level filtering.
Exploit Command (PoC):
gobgp neighbor <target_ip> -s "malformed_open_packet_with_zero_softwareVersionLen"
Detection (Log Analysis):
journalctl -u gobgpd | grep "panic: runtime error"
Mitigation Steps:
1. Patch: Upgrade to GoBGP ≥ 3.35.0.
2. Workaround: Filter BGP peers using ACLs:
gobgp global rib -a ipv4 add <trusted_peer> policy <acl_name>
3. Runtime Protection: Restart GoBGP with panic recovery:
while true; do gobgpd -f /etc/gobgp/gobgpd.conf; done
Code Fix (Patch Reference):
// pkg/packet/bgp/bgp.go
if softwareVersionLen == 0 {
return nil, fmt.Errorf("invalid software version length")
}
Network-Level Protection:
iptables -A INPUT -p tcp --dport 179 -j DROP -s <untrusted_peer>
References:
- GitHub Advisory: GHSA-xxxx-xxxx-xxxx
- NVD: CVE-2025-XXXXX
Sources:
Reported By: github.com
Extra Source Hub:
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