CVE-2019-13628
Medium
Description
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.
SeverityMedium
CVSS4.7
Exploit probability—
ProductWolfssl
PublishedOct 3, 2019
First seenOct 3, 2019
How to fix
Update
- wolfcrypt4.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | v ≤ 4.0.0 | — |
| wolfcryptPyPI | v < 4.1.0 | 4.1.0 |
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