GHSA-q95h-vc86-hv77

wolfCrypt leaks cryptographic information via timing side channel

Source: GitHub Advisory Database (reviewed) Moderate CVE-2019-13628

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	wolfcrypt	< 4.1.0	4.1.0

Details

As written in the advisory (Markdown source, shown as plain text).

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

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2019-13628 advisory
https://eprint.iacr.org/2011/232.pdf web
https://github.com/wolfSSL/wolfcrypt-py package
https://minerva.crocs.fi.muni.cz web
https://tches.iacr.org/index.php/TCHES/article/view/7337 web
http://www.openwall.com/lists/oss-security/2019/10/02/2 web