Vulnerability in Wolfssl
CVE-2019-13628
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- eprint.iacr.org/2011/232.pdf (Technical Description, Third Party Advisory)
- tches.iacr.org/index.php/TCHES/article/view/7337 (Technical Description, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/10/02/2 (mailing-list, Mailing List, Third Party Advisory)
- minerva.crocs.fi.muni.cz/ (Product)
Frequently asked questions
- What is CVE-2019-13628?
- CVE-2019-13628 is a medium-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2019-10-03.
- How severe is CVE-2019-13628?
- Medium severity. CVSS v3 base score is 4.7 out of 10.