CVE-2019-13629 Information

Description

MatrixSSL 4.2.1 and earlier contains a timing side channel in ECDSA signature generation. This allows a local or a remote attacker able to measure the duration of hundreds to thousands of signing operations to compute the private key used. The issue occurs because crypto/pubkey/ecc_math.c scalar multiplication leaks the bit length of the scalar.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.openwall.com/lists/oss-security/2019/10/02/2 https://eprint.iacr.org/2011/232.pdf https://minerva.crocs.fi.muni.cz/ https://tches.iacr.org/index.php/TCHES/article/view/7337

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9