5 - DSA-3125

Multiple vulnerabilities have been discovered in OpenSSL, a Secure Sockets Layer toolkit. The Common Vulnerabilities and Exposures project identifies the following issues:

CVE-2014-3569

Frank Schmirler reported that the ssl23_get_client_hello function in OpenSSL does not properly handle attempts to use unsupported protocols. When OpenSSL is built with the no-ssl3 option and a SSL v3 ClientHello is received, the ssl method would be set to NULL which could later result in a NULL pointer dereference and daemon crash.

CVE-2014-3570

Pieter Wuille of Blockstream reported that the bignum squaring (BN_sqr) may produce incorrect results on some platforms, which might make it easier for remote attackers to defeat cryptographic protection mechanisms.

CVE-2014-3571

Markus Stenberg of Cisco Systems, Inc. reported that a carefully crafted DTLS message can cause a segmentation fault in OpenSSL due to a NULL pointer dereference. A remote attacker could use this flaw to mount a denial of service attack.

CVE-2014-3572

Karthikeyan Bhargavan of the PROSECCO team at INRIA reported that an OpenSSL client would accept a handshake using an ephemeral ECDH ciphersuite if the server key exchange message is omitted. This allows remote SSL servers to conduct ECDHE-to-ECDH downgrade attacks and trigger a loss of forward secrecy.

CVE-2014-8275

Antti Karjalainen and Tuomo Untinen of the Codenomicon CROSS project and Konrad Kraszewski of Google reported various certificate fingerprint issues, which allow remote attackers to defeat a fingerprint-based certificate-blacklist protection mechanism.

CVE-2015-0204

Karthikeyan Bhargavan of the PROSECCO team at INRIA reported that an OpenSSL client will accept the use of an ephemeral RSA key in a non-export RSA key exchange ciphersuite, violating the TLS standard. This allows remote SSL servers to downgrade the security of the session.

CVE-2015-0205

Karthikeyan Bhargavan of the PROSECCO team at INRIA reported that an OpenSSL server will accept a DH certificate for client authentication without the certificate verify message. This flaw effectively allows a client to authenticate without the use of a private key via crafted TLS handshake protocol traffic to a server that recognizes a certification authority with DH support.

CVE-2015-0206

Chris Mueller discovered a memory leak in the dtls1_buffer_record function. A remote attacker could exploit this flaw to mount a denial of service through memory exhaustion by repeatedly sending specially crafted DTLS records.

For the stable distribution (wheezy), these problems have been fixed in version 1.0.1e-2+deb7u14.

For the upcoming stable distribution (jessie), these problems will be fixed soon.

For the unstable distribution (sid), these problems have been fixed in version 1.0.1k-1.

We recommend that you upgrade your openssl packages.