Cryptographic issues in GNU Nettle

1) Cryptographic issues

EUVDB-ID: #VU32327

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-8805

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Nettle: 3.0 - 3.1.1

CPE2.3

• cpe:2.3:a:gnu:nettle:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:nettle:3.1:*:*:*:*:*:*:*
• cpe:2.3:a:gnu:nettle:3.1.1:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-updates/2016-02/msg00091.html
https://lists.opensuse.org/opensuse-updates/2016-02/msg00093.html
https://lists.opensuse.org/opensuse-updates/2016-02/msg00100.html
https://rhn.redhat.com/errata/RHSA-2016-2582.html
https://www.openwall.com/lists/oss-security/2016/02/02/2
https://www.openwall.com/lists/oss-security/2016/02/03/1
https://www.securityfocus.com/bid/84272
https://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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.