MitM attack in wolfSSL

1) Cryptographic issues

EUVDB-ID: #VU46079

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-24613

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a MitM attack.

The vulnerability exists due to incorrect implementation of TLS 1.3 protocol within the SanityCheckTls13MsgReceived() in tls13.c when processing server data in the WAIT_CERT_CR state. A remote attacker can perform a Man-in-the-Middle (MitM) attack and read or modify information passed between clients using the wolfSSL library and TLS servers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

wolfSSL: 4.0 - 4.4.0

CPE2.3

• cpe:2.3:a:wolfssl:wolfssl:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:wolfssl:wolfssl:4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:wolfssl:wolfssl:4.1.0:*:*:*:*:*:*:*

External links

https://research.nccgroup.com/2020/08/24/technical-advisory-wolfssl-tls-1-3-client-man-in-the-middle-attack/

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.