Vulnerability in OpenBSD Libressl
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.010 (62.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: -0.000
Affected products
- OpenBSD Libressl — versions 2.7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec46… (Patch, Third Party Advisory)
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt (Vendor Advisory)
- boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff (Third Party Advisory)
Frequently asked questions
- What is CVE-2018-8970?
- CVE-2018-8970 is a high-severity vulnerability in OpenBSD Libressl, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2018-03-24.
- How severe is CVE-2018-8970?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2018-8970 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.