Debian LTS: Security Advisory for suricata (DLA-2087-1)

Published: 2020-01-31 04:00:08
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:P/A:P

Summary:
The remote host is missing an update for the 'suricata' Linux Distribution Package(s) announced via the DLA-2087-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Two vulnerabilities have recently been discovered in the stream-tcp code of the intrusion detection and prevention tool Suricata. CVE-2019-18625 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 was possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client would have ignored the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. CVE-2019-18792 It was possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet had to be injected just before the PUSH ACK packet we wanted to bypass. The PUSH ACK packet (containing the data) would have been ignored by Suricata because it would have overlapped the FIN packet (the sequence and ack number are identical in the two packets). The client would have ignored the fake FIN packet because the ACK flag would not have been set.

Affected Versions:
'suricata' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', these problems have been fixed in version 2.0.7-2+deb8u5. We recommend that you upgrade your suricata Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-18625
https://nvd.nist.gov/vuln/detail/CVE-2019-18792

References:

https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html
https://security-tracker.debian.org/tracker/DLA-2087-1

Severity
Medium
CVSS Score
6.4
Published
2020-01-31
Modified
2020-01-31
Category
Debian Local Security Checks

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