full-disclosure - [FD] New OpenSSL double-free and invalid free vulnerabilities in X509 parsing

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Message-ID: <CAO5O-EJ3FqEW13CydrhRGibSGMyJgD02s=RwCV1LmJN5hK5+jA@mail.gmail.com>
Date: Tue, 11 Oct 2016 19:18:00 +0200
From: Guido Vranken <guidovranken@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] New OpenSSL double-free and invalid free vulnerabilities in
	X509 parsing

These vulnerabilities were found in the latest OpenSSL (1.1.0b).
Triggering these vulnerabilities is not trivial -- they rely on memory
shortages (malloc/realloc failures) or failing to acquire a thread
lock while the X509 data is being parsed. Possibly exploitation can be
achieved by exploiting a memory leak/accumulation (such as the
recently discovered CVE-2016-6304). Proof of concepts and more
extensive commentary at the link below.

https://github.com/guidovranken/openssl-x509-vulnerabilities

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