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AUSCERT External Security Bulletin Redistribution
ESB-2012.0935
Tivoli Federated Identity Manager - Multiple Protocol XML
signature validation bypass
2 October 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tivoli Federated Identity Manager
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2012-3314
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21612612
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Security Bulletin: Tivoli Federated Identity Manager - Multiple Protocol XML
signature validation bypass (CVE-2012-3314)
Flash (Alert)
Abstract
Tivoli Federated Identity Manager (TFIM) accepts specially crafted messages
that can contain invalid or untrusted XML signatures for certain single sign-on
protocols and token modules. TFIM could mistakenly accept a malicious message,
allowing an attacker to perform actions as another user.
Content
VULNERABILITY DETAILS
CVE ID: CVE-2012-3314
DESCRIPTION:
There are three related issues that can lead to this exposure. Each of these is
described later in this section. All issues have the same consequence, which is
that an attacker can submit a crafted message resulting in an authenticated
session for a valid user account being created and the attacker having control
of the session, thereby impersonating the valid user. The attack does not
require that the valid user authenticate or perform any other action. The
attack does not require local network access, but specialized knowledge and
techniques are required. An exploit will not impact accessibility of system
resources but both the confidentiality of information and the integrity of
transmitted data could be compromised.
1) Incorrect error handling
SAML message components are supposed to be digitally signed, and TFIM is
supposed to check the signature. However, if an attacker sent a specially
crafted SAML message with certain elements unsigned, TFIM would accept the
message without checking the signature.
2) Incorrect element validation
XML messages containing digital signatures elements are routinely validated by
TFIM. XML digital signatures elements are generated for and valid only for
specific nodes/elements in any given XML document. Consequently, any code which
validates XML digital signature elements must correctly use the precise
node/element that the signature was generated for. Under certain conditions, a
malicious XML message with digital signature elements can be crafted which
causes TFIM to use the wrong node/element for validation.
3) Incorrect certificate path validation.
XML signature validation uses certificates. These certificates can either be
contained in the TFIM keystores or included within the XML signature element.
When the signing certificate is included within the XML signature element, the
validation process is not correctly establishing the trust relationship by
validating the certificate chain of the received certificate.
CVSS Base Score: 5.8
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:N)
Details: http://xforce.iss.net/xforce/xfdb/77795
AFFECTED PLATFORMS
All versions of Tivoli Federated Identity Manager are affected, including those
no longer supported. Customers still using versions that are out of support
should upgrade to a supported version to obtain the fixes for this
vulnerability.
Affected supported versions:
Tivoli Federated Identity Manager versions 6.1.1, 6.2.0, 6.2.1, 6.2.2
Tivoli Federated Identity Manager Business Gateway versions 6.1.1,
6.2.0, 6.2.1, 6.2.2
REMEDIATION:
Vendor Fixes: Patches and installation instructions are provided at the URLs
listed below.
Fix Build APAR Download URL
6.1.1-TIV-TFIM-IF0013 6.1.1.13 IV23448 http://www-01.ibm.com/support/docview.wss?uid=swg24032923
6.2.0-TIV-TFIM-IF0011 6.2.0.11 IV23445 http://www-01.ibm.com/support/docview.wss?uid=swg24032920
6.2.1-TIV-TFIM-IF0003 6.2.1.3 IV23442 http://www-01.ibm.com/support/docview.wss?uid=swg24032922
6.2.2-TIV-TFIM-FP0002 6.2.2.2 IV23435 http://www-01.ibm.com/support/docview.wss?uid=swg24032786
WORKAROUNDS:
None
RELATED INFORMATION:
Complete CVSS Guide
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
*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 Flash.
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 Platform Version
Security Tivoli Federated AIX, HP-UX, 6.1.1, 6.2,
Identity Manager Linux, Solaris, 6.2.1, 6.2.2
Business Gateway Windows
Copyright and trademark information
IBM, the IBM logo and ibm.com are trademarks of International Business Machines
Corp., registered in many jurisdictions worldwide. Other product and service
names might be trademarks of IBM or other companies. A current list of IBM
trademarks is available on the Web at "Copyright and trademark information" at
www.ibm.com/legal/copytrade.shtml.
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