Vulnerability Description
An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Oisf | Suricata | 5.0.0 |
| Linux | Linux Kernel | - |
| Microsoft | Windows | - |
| Debian | Debian Linux | 8.0 |
References
- https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318PatchThird Party Advisory
- https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00032.htmlMailing ListThird Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3286Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3395Third Party Advisory
- https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318PatchThird Party Advisory
- https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00032.htmlMailing ListThird Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3286Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3395Third Party Advisory
FAQ
What is CVE-2019-18625?
CVE-2019-18625 is a vulnerability with a CVSS score of 7.5 (HIGH). An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inje...
How severe is CVE-2019-18625?
CVE-2019-18625 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-18625?
Check the references section above for vendor advisories and patch information. Affected products include: Oisf Suricata, Linux Linux Kernel, Microsoft Windows, Debian Debian Linux.