CVE-2019-18625
HIGH severity · CVSS 7.5
7.5CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318 ↗
Additional information
- NVD record
- https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318Patch
- https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0Patch
- https://lists.debian.org/debian-lts-announce/2020/01/msg00032.htmlAdvisory
- https://redmine.openinfosecfoundation.org/issues/3286Advisory
- https://redmine.openinfosecfoundation.org/issues/3395Advisory