5477 / 2 - tas-possible... How did you manage it?

Im sure everyone has figured out what to do with this signature. It fires a lot because of the (gun ad) code used on some high traffic as lanebryant sites.

Intelli shield recommends that filter us servers Web page hosting web non-ASCII.

How am I supposed to know what Web servers host web pages not ASCII? How can you filter this? I do not disable this sig, because it represents an achievement of high risk, but many false positives... What have you done with 5477-2?

Description of 5477 / 2:

This signature is triggered on detection of unicode escape sequences encoded in HTML pages. It is a common way to load the values in memory and is frequently used in the buffer overflow exploits. While the use of unescape() indicates that anything malicious happened, in addition to investigation may be warranted. This signature is also a component of META signature 5556-4.

Recommended filters

Filter servers Web page hosting web non-ASCII.

Benign triggers

Benign triggers have been identified with HTML pages represented in non-ASCII characters.

Thank you very much

I tried replying earlier, do not know if it will do ;-) This made signature part of a META signature 5556-4, eliminating the action prevent to draw on its own (we have disabled for a long time due to the high rate of false positives). If you disable / give up to use it, you need to address 5556-4 as well.

Tags: Cisco Security

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