CVE-2017-8932

moderate-risk

Published 2017-07-06

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.

Do I need to act?

2.0% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.9/10 Medium

NETWORK / HIGH complexity

Affected Products (6)

Suse Package Hub For Suse Linux Enterprise

Leap

Fedora

Affected Vendors

Golang Opensuse Novell Fedoraproject

References (18)

Patch http://lists.opensuse.org/opensuse-updates/2017-06/msg00079.html

Patch http://lists.opensuse.org/opensuse-updates/2017-06/msg00080.html

https://access.redhat.com/errata/RHSA-2017:1859

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1455191

Issue Tracking https://github.com/golang/go/commit/9294fa2749ffee7edbbb817a0ef9fe633136fa9c

Third Party Advisory https://github.com/golang/go/issues/20040

Vendor Advisory https://go-review.googlesource.com/c/41070/

Vendor Advisory https://groups.google.com/d/msg/golang-announce/B5ww0iFt1_Q/TgUFJV14BgAJ

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...