CVE-2018-0732

Published: 12 June 2018

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).

Priority

Low

CVSS 3 base score: 7.5

Status

Package Release Status
openssl
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver)
Released (1.1.0g-2ubuntu4.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (1.0.2g-1ubuntu4.13)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1.0.1f-1ubuntu2.26)
Patches:
Upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=3984ef0b72831da8b3ece4745cac4f8575b19098 (1.0.2)
Upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=ea7abeeabf92b7aca160bdd0208636d4da69f4f4 (1.1)
openssl098
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was needs-triage)
openssl1.0
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver)
Released (1.0.2n-1ubuntu5.1)
Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist