Security Bulletin: IBM MQ Advanced Message Security is vulnerable to an OpenSSL Montgomery squaring function propagation flaw (CVE-2017-3736)

Summary

IBM MQ and IBM WebSphere MQ are affected by an OpenSSL vulnerability which could allow a remote attacker to obtain sensitive information. This is caused by a carry propagation flaw in the the x86_64 Montgomery squaring function bn_sqrx8x_internal().

OpenSSL is used by IBM MQ Advanced Message Security on the IBM i platform only.

Vulnerability Details

CVEID: CVE-2017-3736**
DESCRIPTION:** OpenSSL could allow a remote attacker to obtain sensitive information, caused by a carry propagation flaw in the the x86_64 Montgomery squaring function bn_sqrx8x_internal(). An attacker with online access to an unpatched system could exploit this vulnerability to obtain information about the private key.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/134397 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

Affected Products and Versions

IBM MQ v8.0

• Maintenance levels 8.0.0.0 - 8.0.0.8

IBM MQ v9 LTS

• Maintenance levels 9.0.0.0 - 9.0.0.2

Remediation/Fixes

IBM MQ v8.0

• Apply Fixpack 8.0.0.9

IBM MQ v9 LTS

• Apply Fixpack 9.0.0.3