CVE Vulnerability

CVE-2018-8970

The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.

5.8 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

Scope

7.4 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42 Patch Third Party Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt Vendor Advisory
https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:*
Information

Published : 2018-03-24 09:29

Updated : 2018-04-24 04:40

NVD link : CVE-2018-8970

Mitre link : CVE-2018-8970

Products Affected

Libressl

Openbsd

CWE
CWE-295

Improper Certificate Validation