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Arch Linux: ASA-202007-19 Medium: lib32-openssl Certificate Vulnerability

Calendar Sep 26, 2016 • User Avatar LinuxSecurity Advisories
1 - 2 min read
Archlinux Large Esm H446
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Topics Covered

security advisory medium arch linux lib32-gnutls certificate bypass
The package lib32-gnutls before version 3.4.15-1 is vulnerable to certificate verification bypass. 
Arch Linux Security Advisory ASA-201609-26
=========================================
Severity: Medium
Date    : 2016-09-26
CVE-ID  : CVE-2016-7444
Package : lib32-gnutls
Type    : certificate verification bypass
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package lib32-gnutls before version 3.4.15-1 is vulnerable to
certificate verification bypass.

Resolution
=========
Upgrade to 3.4.15-1.

# pacman -Syu "lib32-gnutls>=3.4.15-1"

The problem has been fixed upstream in version 3.4.15.

Workaround
=========
None.

Description
==========
Incorrect length validation on gnutls's gnutls_ocsp_resp_check_crt
method can allow an attacker to use a OCSP response for a different
certificate (but from the same CA) to continue using a revoked
certificate. This can happen if the serial from the revoked certificate
is a prefix of the other one, and the additional bytes happen to be
equal on the system doing the verification.

Impact
=====
A remote attacker is able to bypass certificate verification and
continue using a revoked certificate under certain circumstances.

References
=========
https://lists.gnupg.org/pipermail/gnutls-devel/2016-September/008146.html
https://gitlab.com/gnutls/gnutls/-/commit/964632f37dfdfb914ebc5e49db4fa29af35b1de9
https://access.redhat.com/security/cve/CVE-2016-7444