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Sig 5753 (s230) - numerous fale positives + proposed fix

To make a long story short: I was investigating a bunch of these signatures firing, and found that simple poor coding (typos, mostly) were triggering all of our events with this sig.

I ran through the RegExp, and discovered that the string stops processing after a double quote ("").

So, a simple typo that ends with ...href="mailto:null@null.com""> will trigger this signature to fire (as it has done many times in our case).

The simple solution I've found would be to add a "not closing tag" ( [^\x3e]+ ) to the end of the RegExp, as such:

[\x3c][Aa][\x20\x09\x0d\x0a][Hh][Rr][Ee][Ff][\x20\x09\x0d\x0a]?[=][\x20\x09\x0d\x0a]?[\x22\x27][Mm][Aa][Ii][Ll][Tt][Oo][:][^\x22\x0d\x0a\x3e]+[\x22][\x22][^\x3e]+

With that RegExp, if there's anything between the "" and the >, the sig will trigger.

Hopefully, the fine folks at Cisco can include this in a sig update in the near future.

-David

1 REPLY
Cisco Employee

Re: Sig 5753 (s230) - numerous fale positives + proposed fix

I will look into this and get back with you shortly.

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