CVE-2017-3732 BN_mod_exp may produce incorrect results on x86_64
A carry propagation bug in OpenSSL's x86_64 Montgomery squaring may allow attackers to deduce private key information from Diffie-Hellman operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-3732?
CVE-2017-3732 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 x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.
Weakness: CWE-200
Which versions are affected by CVE-2017-3732?
It affects 2 products.
Products include Nodejs Node.js, Openssl Openssl.
How do I fix CVE-2017-3732?
Upgrade to a fixed version.
Is CVE-2017-3732 being exploited?
There is no known exploitation of CVE-2017-3732 in the wild and no public exploit code.
Other vulnerabilities in Nodejs Node.js
Sources
Also known as ALPINE-CVE-2017-3732, DEBIAN-CVE-2017-3732, GHSA-5hg3-8gvm-5294, UBUNTU-CVE-2017-3732.