Security Bulletin: Unauthorized access to ReFS files restored by TSM (CVE-2013-5371)

Security Bulletin


Summary

Files restored to ReFS from a TSM backup can have incorrect permissions, allowing an unauthorized user to access and modify the files

Vulnerability Details

CVE ID: CVE-2013-5371

DESCRIPTION:
During TSM Windows client file backup and archive operations, security permissions of files residing on a Resilient File System (ReFS) are not backed up or archived when SKIPNTSECURITYPERMISSIONS NO is in effect (NO is the default value).

During TSM Windows client file restore and retrieve operations to an ReFS file system, security permissions of files are not restored or retrieved when SKIPNTSECURITYPERMISSIONS NO is in effect (NO is the default value). Instead, the restored or retrieved files will have default permissions. If the default permissions are more permissive, an unauthorized user can gain access to and modify the restored or retrieved files.

CVSS:
CVSS Base Score: 2.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/86661 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:N/A:N)

Affected Products

  • Tivoli Storage Manager Windows client version 6.3.1 (the first release and fix pack where ReFS is supported)
  • Tivoli Storage Manager Windows client version 6.4.0
Note: TSM 7.1 is unaffected

Remediation/Fixes

REMEDIATION:

The recommended solution is to apply the fix as soon as practical, and back up all ReFS files again. Please see the 'FIXES' section below for information on the fixes available and the links where the fixes can be downloaded.

FIXES:

TSM Client Release Platform APAR Remediation/First Fix
6.3 Windows IC92933 6.3.2: http://www.ibm.com/support/docview.wss?uid=swg24036718
6.4 Windows IC92933 6.4.1: http://www.ibm.com/support/docview.wss?uid=swg24035567
Note: an upgrade to the TSM 7.1 client would also apply the fix

Workarounds/Mitigations

None

References:

Complete CVSS Guide
On-line Calculator V2

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

21 January 2014: Original copy published
27 January 2014: removed the word 'even' from the two sentences that said 'even when SKIPNTSECURITYPERMISSIONS NO', as the lack of backup, restore, archive, and retrieve of the original permissions is being fixed when the value is NO

*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.

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.

Cross reference information
Segment Product Component Platform Version Edition
Storage Management Tivoli Storage Manager Extended Edition Client Windows 6.3, 6.4
Storage Management IBM System Storage Archive Manager Client Windows 6.3, 6.4

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Document information


More support for:

Tivoli Storage Manager
Client

Software version:

6.3, 6.4

Operating system(s):

Windows

Reference #:

1662608

Modified date:

2014-01-27

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