CVE-2015-8805 Information

Description

The ecc_256_modq 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-2015-8803.

CVSS Vector

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

Reference

http://lists.opensuse.org/opensuse-updates/2016-02/msg00091.html http://lists.opensuse.org/opensuse-updates/2016-02/msg00093.html http://lists.opensuse.org/opensuse-updates/2016-02/msg00100.html http://rhn.redhat.com/errata/RHSA-2016-2582.html http://www.openwall.com/lists/oss-security/2016/02/02/2 http://www.openwall.com/lists/oss-security/2016/02/03/1 http://www.securityfocus.com/bid/84272 http://www.ubuntu.com/usn/USN-2897-1 https://blog.fuzzing-project.org/38-Miscomputations-of-elliptic-curve-scalar-multiplications-in-Nettle.html https://git.lysator.liu.se/nettle/nettle/commit/c71d2c9d20eeebb985e3872e4550137209e3ce4d

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8