CVE-2015-8803

Description

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 9.86% Top 10%
Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory liu.se
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://lists.opensuse.org/opensuse-updates/2016-02/msg00100.html vendor advisory
https://blog.fuzzing-project.org/38-Miscomputations-of-elliptic-curve-scalar-multiplications-in-Nettle.html
https://lists.lysator.liu.se/pipermail/nettle-bugs/2015/003028.html mailing list vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177473.html vendor advisory
http://lists.opensuse.org/opensuse-updates/2016-02/msg00093.html vendor advisory
https://git.lysator.liu.se/nettle/nettle/commit/c71d2c9d20eeebb985e3872e4550137209e3ce4d patch
http://www.ubuntu.com/usn/USN-2897-1 vendor advisory
http://lists.opensuse.org/opensuse-updates/2016-02/msg00091.html vendor advisory
http://www.openwall.com/lists/oss-security/2016/02/02/2 mailing list
http://rhn.redhat.com/errata/RHSA-2016-2582.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176807.html vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177229.html vendor advisory
https://lists.gnu.org/archive/html/info-gnu/2016-01/msg00006.html mailing list
http://www.openwall.com/lists/oss-security/2016/02/03/1 mailing list

Frequently Asked Questions

What is the severity of CVE-2015-8803?
CVE-2015-8803 has been scored as a critical severity vulnerability.
How to fix CVE-2015-8803?
To fix CVE-2015-8803, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-8803 being actively exploited in the wild?
It is possible that CVE-2015-8803 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~10% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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