OpenSSL Security Advisory [05 Feb 2013] ======================================== SSL, TLS and DTLS Plaintext Recovery Attack (CVE-2013-0169) ============================================================ Nadhem Alfardan and Kenny Paterson have discovered a weakness in the handling of CBC ciphersuites in SSL, TLS and DTLS. Their attack exploits timing differences arising during MAC processing. Details of this attack can be found at: http://www.isg.rhul.ac.uk/tls/ All versions of OpenSSL are affected including 1.0.1c, 1.0.0j and 0.9.8x Note: this vulnerability is only partially mitigated when OpenSSL is used in conjuction with the OpenSSL FIPS Object Module and the FIPS mode of operation is enabled. Thanks go to Nadhem J. AlFardan and Kenneth G. Paterson of the Information Security Group Royal Holloway, University of London for discovering this flaw. An initial fix was prepared by Adam Langley <agl@chromium.org> and Emilia K&#195;sper <ekasper@google.com> of Google. Additional refinements were added by Ben Laurie, Andy Polyakov and Stephen Henson of the OpenSSL group. Affected users should upgrade to OpenSSL 1.0.1d, 1.0.0k or 0.9.8y TLS 1.1 and 1.2 AES-NI crash (CVE-2012-2686) ============================================= A flaw in the OpenSSL handling of CBC ciphersuites in TLS 1.1 and TLS 1.2 on AES-NI supporting platforms can be exploited in a DoS attack. If you are unsure if you are using AES-NI see "References" below. Anyone using an AES-NI platform for TLS 1.2 or TLS 1.1 on OpenSSL 1.0.1c is affected. Platforms which do not support AES-NI or versions of OpenSSL which do not implement TLS 1.2 or 1.1 (for example OpenSSL 0.9.8 and 1.0.0) are not affected. Thanks go to Adam Langley <agl@chromium.org> for initially discovering the bug and developing a fix and to Wolfgang Ettlingers <wolfgang.ettlinger@gmail.com> for independently discovering this issue. Affected users should upgrade to OpenSSL 1.0.1d OCSP invalid key DoS issue (CVE-2013-0166) ============================================ A flaw in the OpenSSL handling of OCSP response verification can be exploitedin a denial of service attack. All versions of OpenSSL are affected including 1.0.1c, 1.0.0j and 0.9.8x This flaw was discovered and fixed by Stephen Henson of the OpenSSL core team. Affected users should upgrade to OpenSSL 1.0.1d, 1.0.0k or 0.9.8y. References ========== URL for this Security Advisory: http://www.openssl.org/news/secadv_20130204.txt Wikipedia AES-NI description: http://en.wikipedia.org/wiki/AES-NI