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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Tivoli Access Manager -
illegal-url-substrings feature can be bypassed
28 September 2012
AusCERT Security Bulletin Summary
Product: IBM Tivoli Access Manager
Operating System: AIX
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2012-3303
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Security Bulletin: Tivoli Access Manager - illegal-url-substrings feature can
be bypassed (CVE-2012-3303)
Tivoli Access Manager for e-business
5.1, 6.0, 6.1
The IBM Tivoli Access Manager for e-business "illegal-url-substrings" feature
can be bypassed, disabling the web vulnerability mitigation capability that it
CVE ID: CVE-2012-3303
DESCRIPTION: The "illegal-url-substrings" feature is intended to allow the
specification of URL string patterns that will be blocked by WebSEAL, which
may help mitigate web vulnerabilities such as Cross Site Scripting.
An example of such a pattern is the pattern "<script", which is configured by
default. WebSEAL should, upon receiving a URL containing this pattern anywhere
in the URL string, block the request.
It is possible to bypass this protection with crafted URLs, causing WebSEAL to
fail to correctly parse the URL, and to fail to block the request.
The attack does not require local network access nor does it require
authentication, but specialized knowledge and techniques are required. An
exploit will not impact accessibility of system resources or the
confidentiality of information, but the integrity of data transmitted to the
user browser could be compromised. The consequence of this compromise is that
a user could be exposed to web vulnerabilities, such as cross site scripting,
that the illegal-url-substrings features is intended to help mitigate.
CVSS Base Score: 4.3
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)
* Tivoli Access Manager WebSEAL 5.1 (out of service)
* Tivoli Access Manager WebSEAL 6.0.0 versions before Fixpack 25
* Tivoli Access Manager WebSEAL 6.1.0 versions before Fixpack 4
Customers using version 5.1 should upgrade to a supported version of the
Vendor Fixes: Patches and installation instructions are provided at the URLs
Fix Build APAR Download URL
6.0.0-TIV-AWS-FP0025 100712 IZ52314
6.1.0-TIV-AWS-FP0004 090910 IZ66218
MITIGATIONS: The use of a separate Intrusion Prevention System can help
mitigate web vulnerabilities such as cross site scripting.
* Complete CVSS Guide
* IBM Secure Engineering Web Portal
* IBM Product Security Incident Response Blog
ACKNOWLEDGEMENT: This vulnerability was reported to IBM by Ben Campbell of
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.
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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