High severity · published Mar 24, 2018
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…
7.4
CVSS
1%
EPSS
No
On KEV
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:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libressl · Openbsd
2.7.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-8970
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-8970
Third Party Advisory
https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff
Vendor Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt
Patch
https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42
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