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CVE-2016-0703

Published: 1 March 2016

The get_client_master_key function in s2_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before 1.0.2a accepts a nonzero CLIENT-MASTER-KEY CLEAR-KEY-LENGTH value for an arbitrary cipher, which allows man-in-the-middle attackers to determine the MASTER-KEY value and decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle, a related issue to CVE-2016-0800.

Notes

AuthorNote
mdeslaur
openssl in Ubuntu is compiled with no-ssl2

Priority

High

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
openssl
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Not vulnerable

upstream Needs triage

vivid Not vulnerable

wily Not vulnerable

openssl098
Launchpad, Ubuntu, Debian
precise Not vulnerable

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

vivid Not vulnerable

wily Does not exist

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