Vulnerability CVE-2017-8932
Published: 2017-07-06

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.

Type:

CWE-682

 (Incorrect Calculation)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Opensuse project -> LEAP 
Opensuse -> LEAP 
Novell -> Suse package hub for suse linux enterprise 
Golang -> GO 
Fedoraproject -> Fedora 

 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/package-announce@lists.fedoraproject.org/message/LZH4T47ROLZ6YEZBDVXVS2KISTDMXAPS/
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