ASA-201609-26 log generated external raw
[ASA-201609-26] lib32-gnutls: certificate verification bypass |
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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/index.php/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
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