Security Bulletin: TSM Client Scheduler Denial Of Service Vulnerability (CVE-2013-0471)

DESCRIPTION: A Denial of Service vulnerability in the TSM client traditional scheduler allows a remote attacker to disable the traditional scheduler when it is in Prompted mode (SCHEDMODE=PROMPTED). Once disabled, no more schedules (such as scheduled backups) will be run, and the TSM server log will show that schedules for that node are missed.

CVEID: CVE-2013-0471
CVSS Base Score: 4.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/81215
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P)

AFFECTED PRODUCTS AND VERSIONS:

• TSM Client 6.4.0.0
• TSM Client 6.3.0.x
• TSM Client 6.2.0.0 through 6.2.4.x
• TSM Client 6.1.0.0 through 6.1.5.x
• TSM Client 5.5.0.0 through 5.5.4.x
• all previous releases, which are unsupported

REMEDIATION:

TSM Release	First Fixing VRMF Level	Client Platform	APAR	Link to fix
6.4	6.4.0.1	All	IC87331	http://www.ibm.com/support/docview.wss?uid=swg24034276
6.3	6.3.1.0	All	IC87331	http://www.ibm.com/support/docview.wss?uid=swg24034109
6.2	6.2.5.0	All	IC87331	http://www.ibm.com/support/docview.wss?uid=swg24034630
6.1	None			Upgrade to fixing 6.3 or 6.4 client, or use workarounds
5.5	None			Upgrade to fixing 6.3 or 6.4 client, or use workarounds
5.4 and previous	None			No longer in support Upgrade to fixing 6.3 or 6.4 client, or use workarounds

Workaround(s):
One of the following:

• If using the traditional scheduler, set the SCHEDMODE option value to POLLING, which is the default value, in the client options file or on the command line
• Configure the scheduler to be managed by Client Acceptor Daemon (CAD), by specifying 'MANAGEDSERVICES SCHEDULE' or 'MANAGEDSERVICES SCHEDULE WEBCLIENT' in the client options file

Mitigation(s):
See Workarounds above.

REFERENCES:
· Complete CVSS Guide
· On-line Calculator V2
· CVE-2013-0471
· X-Force Vulnerability Database http://xforce.iss.net/xforce/xfdb/81215

RELATED INFORMATION:
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

ACKNOWLEDGEMENT
None

CHANGE HISTORY
31 January 2013: Original Copy Published
8 February 2013: Added 'One of the following:' to the beginning of the Workaround section, to clarify that either bulleted item is a workaround.
6 June 2013: Added hyperlink to 6.2.5 download.

*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 Flash.

Note: 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