UBUNTU-CVE-2021-45098
- Source
- https://ubuntu.com/security/CVE-2021-45098
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45098.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-45098
- Upstream
- Published
- 2021-12-16T05:15:00Z
- Modified
- 2025-07-18T16:47:04Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
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.
- References
-
- https://ubuntu.com/security/CVE-2021-45098
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
- https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df
- https://redmine.openinfosecfoundation.org/issues/4710
- https://github.com/OISF/suricata/releases
- https://www.cve.org/CVERecord?id=CVE-2021-45098