CVE-2019-13628Medium· 4.7▾ SunlitwolfCrypt leaks cryptographic information via timing side channel
▾ Sunlit zone — Low / medium · no exploitation signal
impact 25.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.4%
0.4% → 0.4%
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.
wolfcrypt < 4.1.0Upgrade to a patched release:
wolfcrypt 4.1.0