high7.5
CVE-2021-45098
An issue was discovered in Suricata before 6.0.4.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Oisf | Suricata | before 6.0.4 |
| Debian | Debian Linux | Versions 9.0, 10.0, 11.0 |
References
- NVD record
- CVE.org record
- 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/releases
- https://redmine.openinfosecfoundation.org/issues/4710
- 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/releases
- https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html
- https://redmine.openinfosecfoundation.org/issues/4710