CVE-2018-8970 — Improper Certificate Validation in Libressl

CWE-295 — Improper Certificate Validation3 documents3 sources
Severity
7.4HIGHNVD
EPSS
0.7%
top 27.65%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Openbsd Libressl
Timeline
PublishedMar 24
Latest updateMay 14

Description

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.

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NExploitability: 2.2 | Impact: 5.2

Affected Packages1 packages

▶NVDopenbsd/libressl2.7.0

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

1
GHSA
GHSA-7gr4-mrjx-cjx9: The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm↗2022-05-14
▶

💬Community

1
HackerOne
Silent omission of certificate hostname verification in LibreSSL and BoringSSL↗2019-09-26
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