Vulnerability CVE-2019-13629


Published: 2019-10-03

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.

Type:

CWE-327

(Use of a Broken or Risky Cryptographic Algorithm)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Matrixssl -> Matrixssl 

 References:
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

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