-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 OpenSSL Security Advisory [28 January 2022] ===========================================
BN_mod_exp may produce incorrect results on MIPS (CVE-2021-4160) ================================================================ Severity: Moderate There is a carry propagation bug in the MIPS32 and MIPS64 squaring procedure. Many EC algorithms are affected, including some of the TLS 1.3 default curves. Impact was not analyzed in detail, because the pre-requisites for attack are considered unlikely and include reusing private keys. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH private key among multiple clients, which is no longer an option since CVE-2016-0701. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0. It was addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to premium support customers only. It will be made available in 1.0.2zc when it is released. The issue only affects OpenSSL on MIPS platforms. If that applies then: OpenSSL 1.0.2 users should apply git commit 6fc1aaaf3 (premium support customers only) OpenSSL 1.1.1 users should upgrade to 1.1.1m OpenSSL 3.0.0 users should upgrade to 3.0.1 This issue was found on the 10th of December 2021 and subsequently fixed by Bernd Edlinger. Note ==== OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended support is available for premium support customers: https://www.openssl.org/support/contracts.html OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind. The impact of these issues on OpenSSL 1.1.0 has not been analysed. Users of these versions should upgrade to OpenSSL 3.0 or 1.1.1. References ========== URL for this Security Advisory: https://www.openssl.org/news/secadv/20220128.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhlersmDwVrHlGQg52cTSbQ5gRJEFAmH0AK4ACgkQ2cTSbQ5g RJG4Agf9HqZVxd3uG7Jq8TnM4HIR5lrQaJAq6pszxqGvSSmjmK6fkVf8G0PI6I4M J8gmlLMfnvDiE2a1yfmzAlXQu3+nTFRMlkkrpfPoBPIrX3ceHa+uRLIlvDm6jTeu vEV+Zko71AlgDb4cGGP9beAEh6l2pPS2DZ94nEiK2LWl6nIUTaTWuV0WACVHnadk Xj6YrDtbM9LpW/yELg4nUvrLCn72D+T3rjaDZVfQHCjw97/TJnSOApv5u0EgBiIi lT3zXBT83qHDsPEfXvQ3Mk4wQiloAmOO4g9B68S84qXq/J8JSowydCQBKhOVQ9uo u3EDFqOsMHS6ahex7RfBnvML0FBXbA== =RvBK -----END PGP SIGNATURE-----
