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CVE-2015-8803

Published: 31 December 2015

The ecc_256_modp function in ecc-256.c in Nettle before 3.2 does not properly handle carry propagation and produces incorrect output in its implementation of the P-256 NIST elliptic curve, which allows attackers to have unspecified impact via unknown vectors, a different vulnerability than CVE-2015-8805.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
nettle
Launchpad, Ubuntu, Debian
precise Not vulnerable
(code not present)
trusty
Released (2.7.1-1ubuntu0.1)
upstream
Released (3.2)
vivid Ignored
(end of life)
wily
Released (3.1.1-4ubuntu0.1)
xenial Not vulnerable
(3.2-1)
yakkety Not vulnerable
(3.2-1)
zesty Not vulnerable
(3.2-1)
Patches:
upstream: https://git.lysator.liu.se/nettle/nettle/commit/c71d2c9d20eeebb985e3872e4550137209e3ce4d

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H