#VU35480 Out-of-bounds read in Suricata - CVE-2019-16411

Vulnerability identifier: #VU35480

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-16411

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Suricata
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Open Information Security Foundation

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in Suricata 4.1.4. By sending multiple IPv4 packets that have invalid IPv4Options, the function IPV4OptValidateTimestamp in decode-ipv4.c tries to access a memory region that is not allocated. There is a check for o->len < 5 (corresponding to 2 bytes of header and 3 bytes of data). Then, "flag = *(o->data + 3)" places one beyond the 3 bytes, because the code should have been "flag = *(o->data + 1)" instead.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Suricata: 4.1.4

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External links
https://lists.openinfosecfoundation.org/pipermail/oisf-announce/
https://suricata-ids.org/2019/09/24/suricata-4-1-5-released/
https://www.code-intelligence.com/cve-2019-16411

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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.