A bug in the standard library ScalarMult implementation of curve P-256for amd64 architectures in Go before 1.7.6 and 1.8.x before 1.8.2 causes incorrect results to be generated for specific input points. An adaptive attack can be mounted to progressively extract the scalar input to ScalarMult by submitting crafted points and observing failures to the derive correct output. This leads to a full key recovery attack against static ECDH, as used in popular JWT libraries.
NOTE: The following CVSS v2.0 metrics and score provided are preliminary and subject to review.
|Base Score:||4.3||Base Metrics:||AV:N/AC:M/Au:N/C:P/I:N/A:N|
|Access Vector:||Network||Attack Complexity:||Medium|
|Authentication:||None required||Confidentiality Impact:||Partial|
|Integrity Impact:||None||Availability Impact:||None|
|Oracle Linux version 7 (golang)||ELSA-2017-1859||2017-08-09|
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