CVE-2017-8932

MEDIUM

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.

References

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/[email protected]/message/LZH4T47ROLZ6YEZBDVXVS2KISTDMXAPS/

Details

Source: MITRE

Published: 2017-07-06

Updated: 2018-10-30

Type: CWE-310

Risk Information

CVSS v2.0

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 5.9

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

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM