CVE-2019-18625

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.34%

Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory debian.org Third-Party Advisory openinfosecfoundation.org Third-Party Advisory openinfosecfoundation.org

Affected: n/a n/a

References

Link	Tags
https://redmine.openinfosecfoundation.org/issues/3286	third party advisory
https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318	third party advisory patch
https://redmine.openinfosecfoundation.org/issues/3395	third party advisory
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0	third party advisory patch
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2019-18625?: CVE-2019-18625 has been scored as a high severity vulnerability.
How to fix CVE-2019-18625?: To fix CVE-2019-18625, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-18625 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2019-18625 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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