CVE-2015-3194: Certificate verify crash with missing PSS parameter

crypto/rsa/rsaameth.c in OpenSSL 1.0.1 before 1.0.1q and 1.0.2 before 1.0.2e allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an RSA PSS ASN.1 signature that lacks a mask generation function parameter.

— MITRE

LibreSSL. Multiple issues were addressed by updating to libressl version 2.6.4.

The following was reported by OpenSSL upstream:

The signature verification routines will crash with a NULL pointer dereference if presented with an ASN.1 signature using the RSA PSS algorithm and absent mask generation function parameter. Since these routines are used to verifycertificate signature algorithms this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication.

This issue affects OpenSSL versions 1.0.2 and 1.0.1.

OpenSSL 1.0.2 users should upgrade to 1.0.2e OpenSSL 1.0.1 users should upgrade to 1.0.1q

This issue was reported to OpenSSL on August 27 2015 by Loïc Jonas Etienne (Qnective AG). The fix was developed by Dr. Stephen Henson of the OpenSSL development team.

— Red Hat