Re: FP on 31977?

["Weir, Jason" <jason.weir () nhrs org>]

Agreed Dave – I don’t suggest changing a rule to make up for a bad application.

Here is another report of a potential fp on this rule

http://sourceforge.net/p/snort/mailman/message/32980285/

If things can be improved so be it – otherwise I’ll just suppress this rule for that site.

-J

From: Dave Killion [mailto:dave.killion () gmail com]
Sent: Monday, March 16, 2015 12:13 PM
To: Weir, Jason; snort-sigs () lists sourceforge net
Subject: Re: [Snort-sigs] FP on 31977?

That is the most horrible web-app I've seen in a long, long time.

I wonder how susceptible it is to cross-site scripting... :)

-Dave

On Mon, Mar 16, 2015 at 7:26 AM Weir, Jason <jason.weir () nhrs org<mailto:jason.weir () nhrs org>> wrote:
Getting hits on 31977 via the GET below – I believe they are false.

GET /services/obituaries.ashx?IncludeSidebar=0&Name=Debra Jones Obituary&String=r. Memorial Home, Franklin-Tilton Road, 
584 West Main St., in Tilton. Deb's family requests that those wishing, may make contributions in her name to 
;(function() { var adKeyValue = 't='; adKeyValue                += escape('clio=MAW'); adKeyValue += 
escape('&cobrand=concordmonitor'); adKeyValue += escape('&linktext=The Make-A-Wish Foundation'); adKeyValue += 
escape('&linkurl=http://ad.doubleclick.net/ddm/clk/286988598%3B113956851%3Bl&apos;); adKeyValue += escape('&fn=Debra'); 
adKeyValue += escape('&ln=Jones'); var adClkUrl = 
'http://pubads.g.doubleclick.net/gampad/jump?iu=/423686928/prod/obit-aff/obit-standard/clio-inline-1&&apos; + adKeyValue + 
'&sz=1x1&c=537810296'; var adImpUrl = 
'http://pubads.g.doubleclick.net/gampad/ad?iu=/423686928/prod/obit-aff/obit-standard/clio-inline-1&&apos; + adKeyValue + 
'&sz=1x1&c=537810296'; document.write(" The Make-A-Wish Foundation "); }()); The Make-A-Wish Foundation of New 
Hampshire, 814 Elm St., Suite 300, Manchester, NH 03101. For more information go to 
smartfuneralhome.com.&location=http://www.legacy.com/obituaries/concordmonitor/obituary.aspx?n=debra-ann-jones-ross&pid=174389739&fhid=13973&randomlabel=ga38770210180839515&published=Sat
 Mar 14 2015 00:00:00 GMT-0400 (Eastern Daylight Time) HTTP/1.1

Looks like the function() { is what is triggering the rule.

Current rule

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"OS-OTHER Bash CGI environment variable injection attempt"; 
flow:to_server,established; content:"() {"; fast_pattern:only; http_uri; metadata:policy balanced-ips drop, policy 
security-ips drop, ruleset community, service http; reference:cve,2014-6271; reference:cve,2014-6277; 
reference:cve,2014-6278; reference:cve,2014-7169; classtype:attempted-admin; sid:31977; rev:4;)

Will adding content:!” function() “ break things?

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"OS-OTHER Bash CGI environment variable injection attempt"; 
flow:to_server,established; content:!” function() “; content:"() {"; fast_pattern:only; http_uri; metadata:policy 
balanced-ips drop, policy security-ips drop, ruleset community, service http; reference:cve,2014-6271; 
reference:cve,2014-6277; reference:cve,2014-6278; reference:cve,2014-7169; classtype:attempted-admin; sid:31977; rev:5;)

Jason

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