Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the gcryeccecdsasign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
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{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libssl-doc": "1.1.0g-2ubuntu4.1", "libssl-dev": "1.1.0g-2ubuntu4.1", "libssl1.1-dbgsym": "1.1.0g-2ubuntu4.1", "libssl1.1-udeb": "1.1.0g-2ubuntu4.1", "libssl1.1": "1.1.0g-2ubuntu4.1", "openssl-dbgsym": "1.1.0g-2ubuntu4.1", "libcrypto1.1-udeb": "1.1.0g-2ubuntu4.1", "openssl": "1.1.0g-2ubuntu4.1" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libssl1.0.0-dbgsym": "1.0.2n-1ubuntu5.1", "libssl1.0-dev": "1.0.2n-1ubuntu5.1", "openssl1.0": "1.0.2n-1ubuntu5.1", "openssl1.0-dbgsym": "1.0.2n-1ubuntu5.1", "libssl1.0.0-udeb": "1.0.2n-1ubuntu5.1", "libssl1.0.0": "1.0.2n-1ubuntu5.1", "libcrypto1.0.0-udeb": "1.0.2n-1ubuntu5.1" } ] }