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This vulnerability (CVE-2015-0291) allows anyone to take a certificate, read its contents and modify it accurately to abuse the vulnerability causing a certificate to crash a client or server. If a client connects to an OpenSSL 1.0.2 server and renegotiates with an invalid signature algorithms extension, a null-pointer dereference occurs.
A workaround for SSL 3.0 and TLS 1.0, roughly equivalent to random IVs from TLS 1.1, was widely adopted by many implementations in late 2011. [30] In 2014, the POODLE vulnerability of SSL 3.0 was discovered, which takes advantage of the known vulnerabilities in CBC, and an insecure fallback negotiation used in browsers. [31]
The affected versions of OpenSSL are OpenSSL 1.0.1 through 1.0.1f (inclusive). Subsequent versions (1.0.1g [70] and later) and previous versions (1.0.0 branch and older) are not vulnerable. [71] Installations of the affected versions are vulnerable unless OpenSSL was compiled with -DOPENSSL_NO_HEARTBEATS. [72] [73]
OpenSSL since version 1.0.2 released in January 2015 [5] LibreSSL since version 2.1.3 released in January 2015 [6] mbed TLS (previously PolarSSL) since version 1.3.6 released in April 2014 [7] s2n since its original public release in June 2015. wolfSSL (formerly CyaSSL) since version 3.7.0 released in October 2015 [8]