CVE-2016-7055 Other in n/a

Medium 5.9 Published 4 May 2017 Updated 6 Aug 2024

A carry propagation bug in OpenSSL's Montgomery multiplication can cause transient authentication failures or erroneous public-key operations under specific non-default configurations.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2016-7055?

CVE-2016-7055 is a medium-severity vulnerability in Nodejs Node.js, published on 4 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

Which versions are affected by CVE-2016-7055?

It affects 2 products.

Products include Nodejs Node.js, Openssl Openssl.

How do I fix CVE-2016-7055?

Upgrade to a fixed version.

Is CVE-2016-7055 being exploited?

There is no known exploitation of CVE-2016-7055 in the wild and no public exploit code.

All Nodejs Node.js vulnerabilities

Sources

Also known as ALPINE-CVE-2016-7055, DEBIAN-CVE-2016-7055, GHSA-hxpw-pxmm-q49r, UBUNTU-CVE-2016-7055.