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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0931 Security Bulletin: Tivoli Access Manager - illegal-url-substrings feature can be bypassed 28 September 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Tivoli Access Manager Publisher: IBM Operating System: AIX HP-UX Linux variants Solaris Windows Impact/Access: Cross-site Scripting -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2012-3303 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21612320 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Tivoli Access Manager - illegal-url-substrings feature can be bypassed (CVE-2012-3303) Flash (Alert) Document information Tivoli Access Manager for e-business WebSEAL Software version: 5.1, 6.0, 6.1 Operating system(s): All Platforms Reference #: 1612320 Modified date: 2012-09-27 Abstract The IBM Tivoli Access Manager for e-business "illegal-url-substrings" feature can be bypassed, disabling the web vulnerability mitigation capability that it offers. Content VULNERABILITY DETAILS 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: CVSS Base Score: 4.3 CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N) Details: http://xforce.iss.net/xforce/xfdb/77475 AFFECTED PLATFORMS * 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 REMEDIATION: Customers using version 5.1 should upgrade to a supported version of the product. Vendor Fixes: Patches and installation instructions are provided at the URLs listed below. Fix Build APAR Download URL 6.0.0-TIV-AWS-FP0025 100712 IZ52314 http://www-933.ibm.com/support/fixcentral/ 6.1.0-TIV-AWS-FP0004 090910 IZ66218 http://www-933.ibm.com/support/fixcentral/ WORKAROUNDS: None MITIGATIONS: The use of a separate Intrusion Prevention System can help mitigate web vulnerabilities such as cross site scripting. RELATED INFORMATION: * 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 Logica 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUGUc+O4yVqjM2NGpAQJuvw//YIJ2paLU/3ZkuD/z6V1EU6dJFdA3LMnn pm6pLRijKJjkkXQHgZczmxDlnkPdW924GcOXj7hgAZukTW0Rr/1xSoj5KnncWUS6 i4DIYp+2ee1vjICzuR9wQ2j2q0vCsDSXLLrrRFIfFVv71w9Ikco+mKMZSj1ihlPG J86x+6WNT8W14E+MavjljifMRgHrSAjF8ZNaRBP8gYaCWMk3uA+M3CW4jjc/nnrv 2U/N6MznOlbvC71CzwBZnxpXXt1D20pRFcNsPMvj7HIbSqsMhgUFaH3pjk4Bv7m3 1niWQRt0GcXryEgvcwI8U9Tjkk2OfpcOcWpyP2bPxxajMf8kUkNr1AM4mYNeTDfl dWVVoUoEANePk1pYIXkslOK7GvlFcYsBEAsA7VWWhXBOTLY+efu8CKR5k4kydkGw zcoAtvxtmqVVYnKXPbeYKwj0YnXVjAlEXgojiNmfQJyNhJmc1pUxfwKoNJvJ3ybf RwfQpWbHq9R1ccLZiSmYF2vNRIU+KD/a8FQdHjaGN6sa+JvCZgCNTRFtY/PVdnCP gWIkG1aYqwkE6cl0x+OeQ842pG49F3hWDGdxqEoxW2TwY/a/Za109i7Bftt9ejp4 iHF97JYXoChDO9+ZsLygX3yWKud3nVcccbtYhdhXl2L09Fiyotu48z8nOgqtIHCf Q+qdNBG7xw8= =C6q9 -----END PGP SIGNATURE-----