CVE-2021-45098 Security feature bypass in n/a
Attackers can bypass HTTP-based signature detection in Suricata by injecting spoofed RST packets with random TCP MD5 options, allowing malicious traffic to evade inspection.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-45098?
CVE-2021-45098 is a high-severity vulnerability in Debian Debian Linux, published on 16 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2021-45098?
It affects 2 products.
Products include Debian Debian Linux, Oisf Suricata.
How do I fix CVE-2021-45098?
Upgrade to a fixed version.
Is CVE-2021-45098 being exploited?
There is no known exploitation of CVE-2021-45098 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-45098, GHSA-cfcf-x7x2-gpf8, UBUNTU-CVE-2021-45098.