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CVE-2020-12402

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow.

Impact

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.

Affected products

VendorProductAffected versions
MozillaFirefox
before 78.0
FedoraprojectFedora
Version 32
OpensuseLeap
Versions 15.1, 15.2
DebianDebian Linux
Version 9.0

Weakness classification

CWE-203

References