#VU32326 Security Features in Nettle - CVE-2015-8804

Vulnerability identifier: #VU32326

Vulnerability 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-2015-8804

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nettle
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

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

x86_64/ecc-384-modp.asm in Nettle before 3.2 does not properly handle carry propagation and produces incorrect output in its implementation of the P-384 NIST elliptic curve, which allows attackers to have unspecified impact via unknown vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Nettle: 3.0 - 3.1.1

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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.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/fa269b6ad06dd13c901dbd84a12e52b918a09cd7
https://lists.gnu.org/archive/html/info-gnu/2016-01/msg00006.html
https://lists.lysator.liu.se/pipermail/nettle-bugs/2015/003024.html

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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.