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AUSCERT External Security Bulletin Redistribution
ESB-2017.0568
Security Bulletin: Table privilege checking may return
outdated results after a table is renamed (CVE-2017-1150)
3 March 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DB2 for Linux, UNIX and Windows
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-1150
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21999515
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Security Bulletin: Information Disclosure vulnerability affects IBM
DB2 LUW (CVE-2017-1150)
Document information
More support for: DB2 for Linux, UNIX and Windows
Software version: 10.1, 10.5, 11.1
Operating system(s): AIX, HP-UX, Linux, Solaris, Windows
Software edition: Advanced Enterprise Server, Advanced Workgroup Server,
Enterprise Server, Express, Express-C, Personal, Workgroup Server
Reference #: 1999515
Modified date: 02 March 2017
Security Bulletin
Summary
When a table is renamed and a new table is created with the old name,
users who had access on the old table may be able to access the new table.
Vulnerability Details
A user may incorrectly acquire privileges on a table if the table is created
with the same name as a previously renamed table. During a RENAME TABLE,
a user maintains privileges on the renamed table. However, if a new table is
then created with the old name, the user may also incorrectly maintain their
privileges on this new table. The problem is caused by the rename operation
not updating the user authorization cache. The error will be cleared up
when the database is deactivated or when the DB2 instance is restarted.
For example:
User A is granted select privilege to table ABC.T1
An authorized user renames table ABC.T1 to ABC.T2
An authorized user creates a new table called ABC.T1
User A can correctly select from ABC.T2 (the new name for the renamed table)
but will incorrectly gain the ability to select from ABC.T1 (new table)
CVEID: CVE-2017-1150
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect
Server) could allow an authenticated attacker with specialized access to
tables that they should not be permitted to view.
CVSS Base Score: 3.1
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/122291 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N)
Affected Products and Versions
All fix pack levels of IBM DB2 V10.1, V10.5 and V11.1 editions listed
below and running on AIX, Linux, HP, Solaris or Windows are affected:
IBM DB2 Express Edition
IBM DB2 Workgroup Server Edition
IBM DB2 Enterprise Server Edition
IBM DB2 Advanced Enterprise Server Edition
IBM DB2 Advanced Workgroup Server Edition
IBM DB2 Direct Advanced Edition
IBM DB2 Direct Standard Edition
IBM DB2 Connect Application Server Edition
IBM DB2 Connect Enterprise Edition
IBM DB2 Connect Unlimited Edition for System i
IBM DB2 Connect Unlimited Edition for System z
The DB2 Connect products mentioned are affected only if a local database
has been created.
Remediation/Fixes
The recommended solution is to apply the appropriate fix for this
vulnerability.
FIX:
The fix for DB2 and DB2 Connect release is in V10.1 FP6 is available for
download from Fix Central.
Customers running any vulnerable fixpack level of an affected Program,
V10.5 and V11.1 can download the special build containing the interim fix
for this issue from Fix Central. These special builds are available based
on the most recent fixpack level for each impacted release: DB2 V10.5 FP8
and DB2 V11.1.1 FP1. They can be applied to any affected fixpack level of
the appropriate release to remediate this vulnerability.
Release Fixed in fix pack APAR Download URL
V10.1 FP6 IT15485 http://www.ibm.com/support/docview.wss?uid=swg24043366
V10.5 TBD IT19399 Special Build for V10.5 FP8:
AIX 64-bit
HP-UX 64-bit
Linux 64-bit, x86-64
Linux 64-bit, POWER big endian
Linux 64-bit, POWER little endian
Linux 64-bit, System z, System z9 or zSeries
Solaris 64-bit, SPARC
Solaris 64-bit, x86-64
Windows 32-bit, x86
Windows 64-bit, x86
Contact technical support for the following platforms:
Inspur
Linux 32-bit, x86-32
V11.1.1 TBD IT19400 Special Build for V11.1.1 FP1:
AIX 64-bit
Linux 64-bit, x86-64
Linux 64-bit, POWER little endian
Linux 64-bit, System z, System z9 or zSeries
Windows 64-bit, x86
Workarounds and Mitigations
Workaround #1
Recycling the database:
db2stop
db2start
Workaround #2
Create a new table with the old table name.
For each affected grantee:
Grant the privilege(s) held by the grantee on the old table.
Revoke the granted privilege(s) from step a.
Drop the table created on step 1 (if not needed anymore).
Workaround #3
Revoke all the privileges from other grantees prior to the RENAME TABLE
and re-grant the privileges to the grantees on the newly named table.
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alerts like this.
References
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
February 28, 2017: Original version published.
March 2, 2017: Clarified wordings in Vulnerability Details
*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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