CVE-2018-0732

Public on 2018-10-30
Modified on 2018-11-08
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).
Severity
Medium
CVSS v3 Base Score
4.3
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 openssl 2018-11-07 22:07 ALAS2-2018-1102
Amazon Linux 1 openssl 2018-10-30 20:50 ALAS-2018-1098

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
NVD CVSSv3 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H