What tuning parameters are available for HTML_Script_Extension_Evasion?
XPU 33.060 (released on June 11, 2013) included a new tuning parameter, pam.html.script.extension.whitelist, that works in conjunction with pam.html.script.extension.blacklist to tune the HTML_Script_Extension_Evasion signature.
HTML_Script_Extension_Evasion will trigger when an HTML <script> tag has a src attribute value with a misleading extension that may evade anti-virus or other security software by misinterpreting the nature of the script file. This signature will trigger on a tag such as <script src='sneaky.jpg'>. Normally, files with .jpg extensions are JPEG images rather than scripts, but a crafty attacker may use .jpg as a script extension to evade detection of an exploit by security software.
By default, the following list of extensions are blacklisted:
If you would like to exclude (whitelist) any of the above extensions so that they will not trigger HTML_Script_Extension_Evasion, you can add the pam.html.script.extension.whitelist parameter with a value of the extension you would like to exclude. If you would like to exclude multiple extensions, they can be entered in the following format:
If you would like to blacklist any additional extensions that are not in the default list, you can add the pam.html.script.extension.blacklist parameter with a value of the extension you would like to blacklist. To blacklist multiple extensions, they can be entered in the following format:
If the above information does not resolve your issue, contact IBM Security Systems Technical Support.
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