CVE-2021-45098
Published: 16 December 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
suricata Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
jammy |
Not vulnerable
(1:6.0.4-3)
|
|
kinetic |
Not vulnerable
(1:6.0.4-3)
|
|
lunar |
Not vulnerable
(1:6.0.4-3)
|
|
mantic |
Not vulnerable
(1:6.0.4-3)
|
|
noble |
Not vulnerable
(1:6.0.4-3)
|
|
trusty |
Ignored
(end of standard support)
|
|
upstream |
Released
(1:6.0.4-1)
|
|
xenial |
Needs triage
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | High |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References
- 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
- NVD
- Launchpad
- Debian