Vulnerabilities > CVE-2021-45098
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.
Vulnerable Configurations
References
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
- https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df
- https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df
- https://github.com/OISF/suricata/releases
- https://github.com/OISF/suricata/releases
- https://redmine.openinfosecfoundation.org/issues/4710
- https://redmine.openinfosecfoundation.org/issues/4710