Vulnerability Details : 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.
Products affected by CVE-2018-8970
- cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-8970
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 32 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-8970
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:N |
8.6
|
4.9
|
NIST | |
|
7.4
|
HIGH | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
2.2
|
5.2
|
NIST |
CWE ids for CVE-2018-8970
-
The product does not validate, or incorrectly validates, a certificate.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-8970
-
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt
Vendor Advisory
-
https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff
e759a9cd84198613199259dbed401f4951747cff - boringssl - Git at GoogleThird Party Advisory
-
https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42
Call strlen() if name length provided is 0, like OpenSSL does. · libressl-portable/openbsd@0654414 · GitHubPatch;Third Party Advisory
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