[arch-security] [ASA-201609-25] gnutls: certificate verification bypass
anthraxx at archlinux.org
Mon Sep 26 20:17:00 UTC 2016
Arch Linux Security Advisory ASA-201609-25
Date : 2016-09-26
CVE-ID : CVE-2016-7444
Package : gnutls
Type : certificate verification bypass
Remote : Yes
Link : https://wiki.archlinux.org/index.php/CVE
The package gnutls before version 3.4.15-1 is vulnerable to certificate
Upgrade to 3.4.15-1.
# pacman -Syu "gnutls>=3.4.15-1"
The problem has been fixed upstream in version 3.4.15.
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.
A remote attacker is able to bypass certificate verification and
continue using a revoked certificate under certain circumstances.
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