Memory-cache side-channel attack on ECDSA signatures in Botan 2.5.0 through 2.6.0 before 2.7.0

CVE-2018-12435 · LOW Severity

AV:L/AC:M/AU:N/C:P/I:N/A:N

Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. 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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