#VU35478 Out-of-bounds read in Suricata - CVE-2019-15699

Vulnerability identifier: #VU35478

Vulnerability risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-15699

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 #BASIC_IMPACT#.

An issue was discovered in app-layer-ssl.c in Suricata 4.1.4. Upon receiving a corrupted SSLv3 (TLS 1.2) packet, the parser function TLSDecodeHSHelloExtensions tries to access a memory region that is not allocated, because the expected length of HSHelloExtensions does not match the real length of the HSHelloExtensions part of the packet.

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/

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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.