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             AUSCERT External Security Bulletin Redistribution

                         suricata security update
                              31 January 2020


        AusCERT Security Bulletin Summary

Product:           suricata
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-18792 CVE-2019-18625 

Original Bulletin: 

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running suricata check for an updated version of the software for 
         their operating system.

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Package        : suricata
Version        : 2.0.7-2+deb8u5
CVE ID         : CVE-2019-18625 CVE-2019-18792

Two vulnerabilities have recently been discovered in the stream-tcp code
of the intrusion detection and prevention tool Suricata.


    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.


    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.

For Debian 8 "Jessie", these problems have been fixed in version

We recommend that you upgrade your suricata packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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