Debian Security Advisory

DLA-1603-1 suricata -- LTS security update

Date Reported:
04 Dec 2018
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 856648, Bug 889842, Bug 856649.
In Mitre's CVE dictionary: CVE-2017-7177, CVE-2017-15377, CVE-2018-6794.
More information:

Several issues were found in suricata, an intrusion detection and prevention tool.

  • CVE-2017-7177

    Suricata has an IPv4 defragmentation evasion issue caused by lack of a check for the IP protocol during fragment matching.

  • CVE-2017-15377

    It was possible to trigger lots of redundant checks on the content of crafted network traffic with a certain signature, because of DetectEngineContentInspection in detect-engine-content-inspection.c. The search engine doesn't stop when it should after no match is found; instead, it stops only upon reaching inspection-recursion limit (3000 by default).

  • CVE-2018-6794

    Suricata is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual.

    TEMP-0856648-2BC2C9 (no CVE assigned yet)

    Out of bounds read in app-layer-dns-common.c. On a zero size A or AAAA record, 4 or 16 bytes would still be read.

For Debian 8 Jessie, these problems have been fixed in version 2.0.7-2+deb8u3.

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: