Arbitrary Code Injection Affecting suricata package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
1.55% (87th percentile)

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  • Snyk IDSNYK-DEBIAN9-SURICATA-540819
  • published6 Jan 2020
  • disclosed6 Jan 2020

Introduced: 6 Jan 2020

CVE-2019-18792  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

There is no fixed version for Debian:9 suricata.

NVD Description

Note: Versions mentioned in the description apply only to the upstream suricata package and not the suricata package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

CVSS Scores

version 3.1