Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
Published 2019-09-10 17:15:12
Updated 2024-06-21 19:15:16
View at NVD,

Exploit prediction scoring system (EPSS) score for CVE-2019-1547

Probability of exploitation activity in the next 30 days EPSS Score History
~ 17 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-1547

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen

References for CVE-2019-1547

Products affected by CVE-2019-1547

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