Vulnerability in Oisf Suricata
CVE-2021-45098
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Oisf Suricata
- Debian Linux — versions 9.0, 10.0, 11.0
Public proof-of-concept exploits
References
- github.com/OISF/suricata/releases (Third Party Advisory, Release Notes)
- redmine.openinfosecfoundation.org/issues/4710 (Exploit, Patch, Issue Tracking, Vendor Advisory)
- forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 (Release Notes, Vendor Advisory)
- github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df (Patch, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-45098?
- CVE-2021-45098 is a high-severity vulnerability in Oisf Suricata. CVSS score: 7.5/10. Published 2021-12-16.
- How severe is CVE-2021-45098?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-45098 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.