TCP session hijacking via disabled window tracking
Published May 28, 2024 · Updated Nov 7, 2024
Session hijacking in OpenWrt 18.06 and later allows attackers on the same Wi-Fi network to impersonate TCP endpoints. OpenWrt enables nf_conntrack_tcp_no_window_check by default, so Netfilter accepts forged reset packets with arbitrary sequence numbers and deletes the victim connection's NAT mapping. Attackers on the same Wi-Fi network can then recover TCP sequence state, terminate connections, or inject plaintext traffic as either endpoint.
Summary
What happened
Session hijacking in OpenWrt 18.06 and later allows attackers on the same Wi-Fi network to impersonate TCP endpoints. OpenWrt enables nf_conntrack_tcp_no_window_check by default, so Netfilter accepts forged reset packets with arbitrary sequence numbers and deletes the victim connection's NAT mapping. Attackers on the same Wi-Fi network can then recover TCP sequence state, terminate connections, or inject plaintext traffic as either endpoint.
The record
- CVE
- CVE-2023-30312
- Published
- May 28, 2024
- Updated
- Nov 7, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-203, T1565.002
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 28, 2024CVE publishedPublication date reported by the CVE source.
- Nov 7, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Exploiting Sequence Number Leakage: TCP Hijacking in NAT-Enabled Wi-Fi Networksproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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