IBM Security Bulletin: Malformed client flows abend MQTT channel (CVE-2015-4943, CVE-2015-4941, CVE-2015-4942) - United States  SECURITY BULLETIN

SUMMARY
 A number of malformed MQTT client flows could be issued by a malicious user to cause the MQXR service to abend and require manual restart. 

VULNERABILITY DETAILS
CVEID: CVE-2015-4943 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4943]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service using a sequence of connect and disconnects which will have to be restarted.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104516 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104516] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID: CVE-2015-4941 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4941]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service due to incorrect handling of abbreviated TLS handshake.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104514 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104514] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 

CVEID: CVE-2015-4942 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4942]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service using a sequence of connect and disconnects which will have to be restarted.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104515 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104515] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 

AFFECTED PRODUCTS AND VERSIONS
IBM WebSphere MQ 8.0 

 - IBM WebSphere MQ 8.0.0.3 and earlier maintenance levels 

IBM WebSphere MQ 7.5 

 - IBM WebSphere MQ 7.5.0.5 and earlier maintenance levels 

IBM WebSphere MQ 7.1 

 - IBM WebSphere MQ 7.1.0.6 and earlier maintenance levels

REMEDIATION/FIXES
WebSphere MQ 8.0 

 - Apply fixpack 8.0.0.4 [http://www-01.ibm.com/support/docview.wss?uid=swg21969244] 

WebSphere MQ 7.5 

 - Apply interim ifix IT09866 [http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&product=ibm/WebSphere/WebSphere+MQ&release=7.5.0.5&platform=All&function=aparId&apars=IT09866] 

WebSphere MQ 7.1 

 - Apply fixpack 7.1.0.7 [http://www-01.ibm.com/support/docview.wss?uid=swg21965293]

WORKAROUNDS AND MITIGATIONS
None

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REFERENCES
Complete CVSS v2 Guide [http://www.first.org/cvss/v2/guide] 
On-line Calculator v2 [http://nvd.nist.gov/CVSS-v2-Calculator] 

RELATED INFORMATION
IBM Secure Engineering Web Portal [http://www.ibm.com/security/secure-engineering/bulletins.html] 
IBM Product Security Incident Response Blog [http://www.ibm.com/blogs/psirt] 

ACKNOWLEDGEMENT
Reported to IBM by Codenomicon at http://www.codenomicon.com/ [http://www.codenomicon.com/] 

CHANGE HISTORY
 01 February 2016: Original version 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. 

RELATED INFORMATION
 A Japanese translation is available [http://www.ibm.com/support/docview.wss?uid=swg21977182]

Question: Help with Security Bulletin: Malformed client flows abend MQTT channel (CVE-2015-4943, CVE-2015-4941, CVE-2015-4942) I need to understand details regarding Security Bulletin: Malformed client flows abend MQTT channel (CVE-2015-4943, CVE-2015-4941, CVE-2015-4942). Where can I find this information? 

Answer: CVEID: CVE-2015-4943 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4943]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service using a sequence of connect and disconnects which will have to be restarted.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104516 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104516] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID: CVE-2015-4941 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4941]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service due to incorrect handling of abbreviated TLS handshake.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104514 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104514] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 

CVEID: CVE-2015-4942 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4942]
DESCRIPTION: IBM WebSphere MQ could allow a remote attacker to crash the MQXR service using a sequence of connect and disconnects which will have to be restarted.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/104515 [https://exchange.xforce.ibmcloud.com/vulnerabilities/104515] for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)