CVE-2018-6794
First published: Wed Feb 07 2018(Updated: )
Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Suricata-ids Suricata | <4.0.4 | |
| Debian Debian Linux | =8.0 |
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Reference Links
- https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1
- https://lists.debian.org/debian-lts-announce/2018/12/msg00000.html
- https://redmine.openinfosecfoundation.org/issues/2427
- https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/
- https://www.exploit-db.com/exploits/44247/
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2018-6794.
What is the severity of CVE-2018-6794?
The severity of CVE-2018-6794 is medium, with a severity value of 5.3.
Which software versions are affected by CVE-2018-6794?
Suricata versions up to and exclusive of 4.0.4 and Debian Linux version 8.0 are affected by CVE-2018-6794.
How can the HTTP detection bypass vulnerability in Suricata be exploited?
If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients.
How can I fix CVE-2018-6794?
To fix CVE-2018-6794, update Suricata to version 4.0.4 or higher and update Debian Linux to a version higher than 8.0.
- collector/nvd-index
- agent/references
- agent/author
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- agent/last-modified-date
- agent/softwarecombine
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- collector/mitre-cve
- source/MITRE
- vendor/suricata-ids
- canonical/suricata-ids suricata
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/8.0