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AUSCERT External Security Bulletin Redistribution
ESB-2019.2362.3
Security Bulletin: IBM Db2 is vulnerable to privilege escalation to root
via malicious use of fenced user (CVE-2019-4057)
26 July 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DB2 for Linux, UNIX and Windows
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-4057
Original Bulletin:
https://www-01.ibm.com/support/docview.wss?uid=ibm10880735
Revision History: July 26 2019: Added links for repackaged V11.1, V10.1 and
V9.7 images. Remaining links for V10.5
platforms and V9.7 linuxia32 will be added as
soon as the repackaged images are available.
July 19 2019: The images on Unix-type platforms need to be
repackaged due to problem with db2iupdt tool.
Disabled links until the new repackaged image
is available.
June 28 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: IBM(R) Db2(R) is vulnerable to privilege escalation to root via
malicious use of fenced user (CVE-2019-4057).
Document information
More support for: DB2 for Linux, UNIX and Windows
Software version: 9.7, 10.1, 10.5, 11.1
Operating system(s): AIX, HP-UX, Linux, Solaris
Reference #: 0880735
Modified date: 24 July 2019
Summary
When a DB2 instance is created a "fenced" user is specified to run external
stored procedures/user defined functions. Db2 could allow malicious user with
access to the Db2 instance owner account to leverage a fenced execution
process to execute arbitrary code as root. This vulnerability exists even if
fenced stored procedures are not used.
Vulnerability Details
CVEID: CVE-2019-4057
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server)
could allow malicious user with access to the DB2 instance account to leverage
a fenced execution process to execute arbitrary code as root.
CVSS Base Score: 6.7
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
156567 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
All fix pack levels of IBM Db2 V9.7, V10.1, V10.5, and V11.1 editions on all
platforms except Windows are affected. Windows is not affected.
Remediation/Fixes
The recommended solution is to apply the appropriate fix for this
vulnerability.
FIX:
Customers running any vulnerable fixpack level of an affected Program, V9.7,
V10.1, 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 V9.7 FP11,
V10.1 FP6, V10.5 FP10 and V11.1.4.4 iFix001. They can be applied to any
affected fixpack level of the appropriate release to remediate this
vulnerability.
+---------------+----------+----------+--------------------------------------------------------------------+
|Release |Fixed in |APAR |Download URL |
| |fix pack | | |
+---------------+----------+----------+--------------------------------------------------------------------+
|V9.7 |TBD |IT27205 |Special Build for V9.7 FP11: |
| | | | |
| | | |AIX 64-bit |
| | | |HP-UX 64-bit |
| | | |Linux 32-bit, x86-32 |
| | | |Linux 64-bit, x86-64 |
| | | |Linux 64-bit, POWER(TM) big endian |
| | | |Linux 64-bit, System z(R), System z9(R) or zSeries(R) |
| | | |Solaris 64-bit, SPARC |
| | | |Solaris 64-bit, x86-64 |
+---------------+----------+----------+--------------------------------------------------------------------+
|V10.1 |TBD |IT27204 |Special Build for V10.1 FP6: |
| | | | |
| | | |AIX 64-bit |
| | | |HP-UX 64-bit |
| | | |Linux 32-bit, x86-32 |
| | | |Linux 64-bit, x86-64 |
| | | |Linux 64-bit, POWER(TM) big endian |
| | | |Linux 64-bit, System z(R), System z9(R) or zSeries(R) |
| | | |Solaris 64-bit, SPARC |
| | | |Solaris 64-bit, x86-64 |
+---------------+----------+----------+--------------------------------------------------------------------+
|V10.5 |TBD |IT27192 |Special Build for V10.5 FP10: |
| | | | |
| | | |AIX 64-bit |
| | | |HP-UX 64-bit |
| | | |Linux 32-bit, x86-32 |
| | | |Linux 64-bit, x86-64 |
| | | |Linux 64-bit, POWER(TM) big endian |
| | | |Linux 64-bit, POWER(TM) little endian |
| | | |Linux 64-bit, System z(R), System z9(R) or zSeries(R) |
| | | |Solaris 64-bit, SPARC |
| | | |Solaris 64-bit, x86-64 |
| | | |Inspur |
+---------------+----------+----------+--------------------------------------------------------------------+
|V11.1 |TBD |IT27203 |Special Build for V11.1.4.4 iFix001: |
| | | | |
| | | |AIX 64-bit |
| | | |Linux 32-bit, x86-32 |
| | | |Linux 64-bit, x86-64 |
| | | |Linux 64-bit, POWER(TM) little endian |
| | | |Linux 64-bit, System z(R), System z9(R) or zSeries(R) |
| | | |Solaris 64-bit, SPARC |
+---------------+----------+----------+--------------------------------------------------------------------+
Workarounds and Mitigations
None.
Change History
June 27, 2019: Original Version Published.
July 18, 2019: The images on Unix-type platforms need to be repackaged due to
problem with db2iupdt tool. Disabled links until the new repackaged images are
available.
July 24, 2019: Added links for repackaged V11.1, V10.1 and V9.7 images.
Remaining links for V10.5 platforms and V9.7 linuxia32 will be added as soon
as the repackaged images are available.
*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.
- --------------------------END INCLUDED TEXT--------------------
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