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CVE-2018-12384

Published: 4 September 2018

When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.

Priority

Low

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
nss
Launchpad, Ubuntu, Debian
upstream
Released (3.36.5,3.39)
trusty
Released (2:3.28.4-0ubuntu0.14.04.4)
xenial
Released (2:3.28.4-0ubuntu0.16.04.4)
bionic
Released (2:3.35-2ubuntu2.1)
cosmic
Released (2:3.36.1-1ubuntu1.1)
Patches:
upstream: https://hg.mozilla.org/projects/nss/rev/46f9a1f40c3d (3.36)
upstream: https://hg.mozilla.org/projects/nss/rev/f182a11fbe53 (3.36)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N