Rapid7 Vulnerability & Exploit Database

OpenSSL Client DoS due to large DH parameter (CVE-2018-0732)

Free InsightVM Trial No Credit Card Necessary
Watch Demo See how it all works
Back to Search

OpenSSL Client DoS due to large DH parameter (CVE-2018-0732)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
06/12/2018
Created
07/25/2018
Added
06/13/2018
Modified
06/20/2019

Description

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).

Solution(s)

  • http-openssl-1_0_2-upgrade-1_0_2_p
  • http-openssl-1_1_0-upgrade-1_1_0_i

References

View more

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;