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ibmIBM03F6BE239E8BF6FDDA6BA3CD245A4F46A3FB8182F139BA77C08E9CD4C4A33FEE
HistoryJun 16, 2018 - 9:25 p.m.

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Security Access Manager for Web and IBM Tivoli Access Manager for e-business (CVE-2015-4000)

2018-06-1621:25:51
www.ibm.com
48

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Security Access Manager for Web and IBM Tivoli Access Manager for e-business.

Vulnerability Details

CVEID: CVE-2015-4000**
DESCRIPTION:** The TLS protocol could allow a remote attacker to obtain sensitive information, caused by the failure to properly convey a DHE_EXPORT ciphersuite choice. An attacker could exploit this vulnerability using man-in-the-middle techniques to force a downgrade to 512-bit export-grade cipher. Successful exploitation could allow an attacker to recover the session key as well as modify the contents of the traffic. This vulnerability is commonly referred to as “Logjam”.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM Tivoli Access Manager for e-business versions 6.0, 6.1, 6.1.1
IBM Security Access Manager for Web version 7.0 software
IBM Security Access Manager for Web version 7.0 appliance, all firmware versions
IBM Security Access Manager for Web version 8.0 appliance, all firmware versions

Remediation/Fixes

The table below provides links to patches for all affected IBM Security Access Manager for Web appliance versions. Follow the installation instructions in the README file included with the patch.

Product VRMF APAR Remediation
IBM Security Access Manager for Web
(appliance-based) _7.0.0.0 -
7.0.0.15_ IV75309 Apply the 7.0.0.16 interim fix:_
_7.0.0-ISS-WGA-IF0016
IBM Security Access Manager for Web _8.0.0.1 -
8.0.1.3_ IV75304 Upgrade to the 8.0.1.3 interim fix:
8.0.1.3-ISS-WGA-IF0001

The table below describes the remediation for all affected IBM Tivoli Access Manager for e-business and IBM Security Access Manager for Web** **software versions.

Product VRMF APAR Remediation
IBM Tivoli Access Manager for e-business 6.0 IV75107 1) Apply the 6.0.0.40 interim fix:
6.0.0-ISS-TAM-IF0040
  1. Upgrade the WebSphere Application Server installations in your environment as described in this bulletin:
    <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;
    IBM Tivoli Access Manager for e-business | 6.1| IV75107| 1) Apply the 6.1.0.21 interim fix:
    6.1.0-ISS-TAM-IF0021
  2. Upgrade the WebSphere Application Server installations in your environment as described in this bulletin:
    <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;
    IBM Tivoli Access Manager for e-business | 6.1.1| IV75309| 1) Apply the 6.1.1.20 interim fix:
    6.1.1-ISS-TAM-IF0020
  3. Upgrade the WebSphere Application Server installations in your environment as described in this bulletin:
    <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;
    IBM Security Access Manager for Web
    (software-installation)| 7.0.0.0 -
    7.0.0.15| IV75309| 1) Apply the 7.0.0.16 interim fix:
    7.0.0-ISS-SAM-IF0016
  4. Upgrade the WebSphere Application Server installations in your environment as described in this bulletin:
    <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;

You should verify applying this configuration change does not cause any compatibility issues. If you change the default setting after applying the fix, you will expose yourself to the attack described above. IBM recommends that you review your entire environment to identify other areas where you have enabled the Diffie-Hellman key-exchange protocol used in TLS and take appropriate mitigation and remediation actions.

_For __IBM Tivoli Access Manager 5.1, _IBM recommends upgrading to a fixed, supported release of the product.

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

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