#VU36029 Out-of-bounds read in Suricata and Debian Linux - CVE-2018-10242

Vulnerability identifier: #VU36029

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-10242

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Suricata
Server applications / IDS/IPS systems, Firewalls and proxy servers
Debian Linux
Operating systems & Components / Operating system

Vendor: Open Information Security Foundation
Debian

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Suricata version 4.0.4 incorrectly handles the parsing of the SSH banner. A malformed SSH banner can cause the parsing code to read beyond the allocated data because SSHParseBanner in app-layer-ssh.c lacks a length check.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Suricata: 4.0.4

Debian Linux: 4.0.4 - 8.0

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External links
https://lists.debian.org/debian-lts-announce/2019/04/msg00010.html
https://suricata-ids.org/2018/07/18/suricata-4-0-5-available/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.