CVE-2019-13628: Observable Discrepancy

May 24, 2022 (updated July 17, 2023)

wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without –enable-fpecc, –enable-sp, or –enable-sp-math) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.

References

www.openwall.com/lists/oss-security/2019/10/02/2
eprint.iacr.org/2011/232.pdf
github.com/advisories/GHSA-q95h-vc86-hv77
minerva.crocs.fi.muni.cz/
nvd.nist.gov/vuln/detail/CVE-2019-13628
tches.iacr.org/index.php/TCHES/article/view/7337

Code Behaviors & Features

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