CVE-2017-8932 Information

Description

A bug in the standard library ScalarMult implementation of curve P-256 for 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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://lists.opensuse.org/opensuse-updates/2017-06/msg00079.html http://lists.opensuse.org/opensuse-updates/2017-06/msg00080.html https://access.redhat.com/errata/RHSA-2017:1859 https://bugzilla.redhat.com/show_bug.cgi?id=1455191 https://github.com/golang/go/commit/9294fa2749ffee7edbbb817a0ef9fe633136fa9c https://github.com/golang/go/issues/20040 https://go-review.googlesource.com/c/41070/ https://groups.google.com/d/msg/golang-announce/B5ww0iFt1_Q/TgUFJV14BgAJ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZH4T47ROLZ6YEZBDVXVS2KISTDMXAPS/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9