CVE-2018-8970

7.4HIGH

Key Information:

Vendor
OpenBSD
Status
Libressl
Vendor
CVE Published:
24 March 2018

Badges

👾 Exploit Exists🟡 Public PoC

Summary

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.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-8970
Created by tiran

References

https://github.com/libressl-portable/openbsd/commit/06544...
x_refsource_MISC
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7...
x_refsource_MISC
https://boringssl.googlesource.com/boringssl/+/e759a9cd84...
x_refsource_MISC

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.