CVE-2019-13629

low-risk
Published 2019-10-03

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.

Do I need to act?

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0.27% 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
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Matrixssl

References (8)

Mailing List http://www.openwall.com/lists/oss-security/2019/10/02/2
Not Applicable https://eprint.iacr.org/2011/232.pdf
Product https://minerva.crocs.fi.muni.cz/
Not Applicable https://tches.iacr.org/index.php/TCHES/article/view/7337
Mailing List http://www.openwall.com/lists/oss-security/2019/10/02/2
Not Applicable https://eprint.iacr.org/2011/232.pdf
Product https://minerva.crocs.fi.muni.cz/
Not Applicable https://tches.iacr.org/index.php/TCHES/article/view/7337
24
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal