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Security Bulletin: IBM Informix Client SDK CPU utilization (CVE-2014-0963)

Security Bulletin


Summary

Informix Client SDK is affected by a problem related to the SSL implementation which, under very specific conditions, can cause CPU utilization to rapidly increase.

Vulnerability Details

CVE ID: CVE-2014-0963
DESCRIPTION:
Informix Client SDK is affected by a problem with the handling of certain SSL messages. The TLS implementation can, under very specific conditions, cause CPU utilization to rapidly increase. The situation occurs only in a certain error case that causes a single thread to begin looping. If this happens multiple times, more threads will begin to loop and an increase in CPU utilization will be seen. This increase could ultimately result in CPU exhaustion and unresponsiveness of the Informix Client SDK and other software running on the affected system.

This issue can affect the availability of the system, but does not impact system confidentiality or integrity. This vulnerability can be remotely exploited, authentication is not required and the exploit is moderately complex.

To determine if your systems are being affected by this issue, you can monitor the CPU utilization for Informix Client SDK instances.


CVSS Base Score: 7.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/92844 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)

Affected Products and Versions

CSDK 3.50, 3.70 and 4.10

Remediation/Fixes

Product Remediation/First Fix
Informix Client SDK 4.10 Upgrade to 4.10.xC4 or download and install GSKit (see next section)
Informix Client SDK 3.70 Upgrade to 3.70.xC9 or download and install GSKit (see next section)
Informix Client SDK 3.50 Upgrade and install GSKit (see next section)

Upgrading GSKit:

  1. Download the appropriate GSKit using the following table:
    Product Required GSKit version GSKit link
    Informix Client SDK 4.10

    Informix Client SDK 3.70 (all platforms other than HP-UX PA-RISC)
    8.0.50.20 AIX (pSeries_32, pSeries_64)
    HP-UX (Itanium_32, Itanium_64)
    Linux (x86_32, x86_64, pSeries_64, zSeries_32, zSeries_64)
    Solaris (SPARC_32, SPARC_64, x86_32, x86_64)
    Windows (x86_32, x86_64)
    Informix Client SDK 3.70 (HP-UX PA-RISC platforms only) 7.0.4.50 HP-UX (PA-RISC_32, PA-RISC_64)
    Informix Client SDK 3.50 7.0.4.50 AIX (pSeries_32, pSeries_64)
    HP-UX (Itanium_32, Itanium_64, PA-RISC_32, PA-RISC_64)
    Linux (x86_32, x86_64, pSeries_64, zSeries_32, zSeries_64)
    Solaris (SPARC_32, SPARC_64, x86_32, x86_64)
    Windows (x86_32, x86_64)
  2. Unix/Linux instructions:
    1. Copy the downloaded tar file(s) to $INFORMIXDIR/gskit. Note: the old gskit .tar files must be removed or renamed to not end in .tar.
    2. Bring the database server offline. (e.g. onmode -ky).
    3. Change to the GSKit directory (cd $INFORMIXDIR/gskit).
    4. As root, run "./installgskit".
    5. To verify the installation, run the appropriate command (i.e. gsk7ver, gsk7ver_64, gsk8ver or gsk8ver_64) for the GSKit you installed. The new version should be 7.0.4.50 or 8.0.50.20.
  3. Windows GSkit version 7 x86_32 instructions:
    1. Copy/download the gsk7d_7.0.4.50_win32.exe file to C:\tmp.
    2. Start the 'cmd' program.
    3. Change to the C:\temp directory (cd c:\tmp).
    4. Run "gsk7d_7.0.4.50_win32.exe /D tmp". This will extract the files to the C:\tmp\tmp directory.
    5. Change to the C:\tmp\tmp directory (cd C:\tmp\tmp).
    6. Run "setup GSK7BAS". Accept all of the defaults.
    7. To verify the installation, run gsk7ver to verify the installation. The new version should be 7.0.4.50.
  4. All other Windows versions instructions:
    1. Copy/download the appropriate file (gsk7d_7.0.4.50_win64.msi, gsk8ssl32.exe or gsk8ssl64.exe) to C:\tmp.
    2. Using Windows Explorer, double click on the downloaded file. This will start Install Shield. Accept all of the defaults.
    3. To verify the installation, run the appropriate command (i.e. gsk7ver_64, gsk8ver or gsk8ver_64) for the GSKit you installed. The new version should be 7.0.4.50 or 8.0.50.20.

Workarounds and Mitigations

Monitor CPU utilization of your Program Name instances. If utilization becomes abnormally high, stop and restart the affected instance.

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Important note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.

References

Complete CVSS v2 Guide
On-line Calculator v2

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

14 May 2014: Original copy 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.

Document information

More support for: Informix Tools
Informix Client Software Development Kit (CSDK)

Software version: 3.5, 3.7, 4.1

Operating system(s): AIX, HP-UX, Linux, OS X, Solaris, Windows

Reference #: 1673018

Modified date: 14 May 2014