CVE-2019-13628

low-risk
Published 2019-10-03

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.

Do I need to act?

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0.14% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.7/10 Medium
LOCAL / HIGH complexity

Affected Products (1)

Affected Vendors

Wolfssl

References (8)

Mailing List http://www.openwall.com/lists/oss-security/2019/10/02/2
Technical Description https://eprint.iacr.org/2011/232.pdf
Product https://minerva.crocs.fi.muni.cz/
Technical Description https://tches.iacr.org/index.php/TCHES/article/view/7337
Mailing List http://www.openwall.com/lists/oss-security/2019/10/02/2
Technical Description https://eprint.iacr.org/2011/232.pdf
Product https://minerva.crocs.fi.muni.cz/
Technical Description https://tches.iacr.org/index.php/TCHES/article/view/7337
18
/ 100
low-risk
Severity 12/34 · Low
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal