ESB-2019.1224 - [Linux][Solaris][AIX] IBM Sterling Connect:Express for UNIX: Access privileged data - Remote/unauthenticated 2019-04-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1224
           Security Bulletin: OpenSSL Vulnerability Affects IBM
             Sterling Connect:Expressf or UNIX (CVE-2019-1559)
                               10 April 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Sterling Connect:Express for UNIX
Publisher:         IBM
Operating System:  AIX
                   Linux variants
                   Solaris
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1559  

Reference:         ASB-2019.0088
                   ESB-2019.1147
                   ESB-2019.0649
                   ESB-2019.0630
                   ESB-2019.0620

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10879545

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Security Bulletin: OpenSSL Vulnerability Affects IBM Sterling Connect:Express
for UNIX (CVE-2019-1559)

Security Bulletin

Document information

More support for: Sterling Connect:Express for UNIX

Software version: 1.5.0

Operating system(s): AIX, Linux, Solaris

Reference #: 0879545

Modified date: 08 April 2019

Summary

A security vulnerability has been disclosed on 26th February 2019 by the
OpenSSL Project. OpenSSl is used by IBM Sterling Connect:Express for UNIX. IBM
Sterling Connect:Express for UNIX has addressed the applicable CVE.

Vulnerability Details

CVEID: CVE-2019-1559

DESCRIPTION: If an application encounters a fatal protocol error and then calls
SSL_shutdown() twice (once to send a close_notify, and once to receive one)
then OpenSSL can respond differently to the calling application if a 0 byte
record is received with invalid padding compared to if a 0 byte record is
received with an invalid MAC. If the application then behaves differently based
on that in a way that is detectable to the remote peer, then this amounts to a
padding oracle that could be used to decrypt data. In order for this to be
exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites
are optimised implementations of certain commonly used ciphersuites. Also the
application must call SSL_shutdown() twice even if a protocol error has
occurred (applications should not do this but some do anyway). Fixed in OpenSSL
1.0.2r (Affected 1.0.2-1.0.2q).
CVSS Base Score: 5.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
157514
CVSS Environment 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 Sterling Connect:Express for UNIX 1.5.0.15

All versions prior to and including 1.5.0.15 iFix 150-1510

Remediation/Fixes

Apply the OpenSSL 1.0.2r Updater for Connect:Express for Unix available on Fix
Central.

Workarounds and Mitigations

None.

Change History

08 April 2019: Original document published

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF
ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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