Medium severity · published Oct 3, 2019
CVE-2019-13629
MatrixSSL 4.2.1 and earlier contains a timing side channel in ECDSA signature generation
5.9
CVSS
1.2%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Matrixssl · Matrixssl
through 4.2.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-13629
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-13629
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
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