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Bug #4821

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xbits: no error on invalid 'expire' values

Added by Jeff Lucovsky about 1 year ago. Updated 7 months ago.

Status:
Rejected
Priority:
Normal
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Target version:
Affected Versions:
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Description

alert http any any -> any any (msg:"TEST - No Error")"; flow:established,to_server; http.method; content:"GET"; xbits:set,ET.2020_8260.1,track ip_src,expire 10,noalert; sid:1;)
alert http any any -> any any (msg:"TEST - Error")"; flow:established,to_server; http.method; content:"GET"; xbits:set,ET.2020_8260.1,noalert,track ip_src,expire 10; sid:2;)
alert http any any -> any any (msg:"TEST - No Error")"; flow:established,to_server; http.method; content:"GET"; xbits:set,ET.2020_8260.1,track ip_src,expire 10,asdf; sid:3;)

only sid 2 produces an error, despite that all 3 sids should be considered "invalid"

Error Produced by sid:2

[1539] 27/10/2021 -- 21:58:51 - (detect-xbits.c:208) <Error> (DetectXbitParse) -- [ERRCODE: SC_ERR_PCRE_MATCH(2)] - "set,ET.2020_8260.1,noalert,track ip_src,expire 10" is not a valid setting for xbits.

I'd also add that the documentation is a bit vague on the proper use of the noalert keyword in relation to xbits. It currently reads

To not alert, use noalert;

I suggest adding a bit of context which indicates it should be a standalone keyword in the rule and not an "option" to the xbits keyword.


Related issues 1 (1 open0 closed)

Copied from Bug #4786: xbits: no error on invalid 'expire' valuesIn ProgressShivani BhardwajActions
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