[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

[SECURITY] [DLA 2087-1] suricata security update

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


mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net

Attachment: signature.asc
Description: PGP signature

Reply to: