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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 Severity Score

7.5

Score breakdown

Status

Package Release Status
openssl
Launchpad, Ubuntu, Debian
artful
Released (1.0.2g-1ubuntu13.6)
bionic
Released (1.1.0g-2ubuntu4.1)
cosmic
Released (1.1.0g-2ubuntu5)
disco
Released (1.1.0g-2ubuntu5)
trusty
Released (1.0.1f-1ubuntu2.26)
upstream Needs triage

xenial
Released (1.0.2g-1ubuntu4.13)
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
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Needs triage

xenial Does not exist

openssl1.0
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (1.0.2n-1ubuntu5.1)
cosmic
Released (1.0.2n-1ubuntu6)
disco Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H