Cryptographic issues in LibreSSL - CVE-2018-8970
Published: September 4, 2018
Vulnerability identifier: #VU14600
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-8970
CWE-ID: CWE-310
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenBSD
Affected software:
LibreSSL
LibreSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to the int_x509_param_set_hosts() function in lib/libcrypto/x509/x509_vpm.c does not correctly handle a case where hostname lenght is zero that leads to silent hostname omission during domain name verification process.
A remote unauthenticated attacker can create a specially crafted certificate, perform a man-in-the-middle (MitM) attack and gain access to sensitive information.
How to mitigate CVE-2018-8970
Install updates from vendor's website.