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WAF blocks use of Confluence site

Hello,

I have a Confluence website running, protected by web server protection. At first accessing it was configured with DNAT rules and everything was working fine. After switching to WAF several problems occur. First I had to turn of form hardening or no one could login to the site.

That is possible now, but when someone tries to edit a wiki page and safe that an error occurs:

Forbidden

You don't have permission to access /pages/doeditpage.action on this server.

When I look in the logs I can see the following:


2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.910310 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Rule a3c0550 [id "950018"][file "/usr/apache/conf/waf/modsecurity_crs_generic_attacks.conf"][line "93"] - Execution error - PCRE limits exceeded (-8): (null). [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: id="0299" srcip="A.A.A.198" localip="B.B.B.243" size="37228" user="-" host="A.A.A.198" method="GET" statuscode="200" reason="-" extra="-" exceptions="-" time="227768" url="/rest/documentConversion/latest/conversion/thumbnail/3899527/1" server="confluence.C.C" referer="confluence.C.C/.../editpage.action
2015:11:02-19:40:43 utm reverseproxy: id="0299" srcip="A.A.A.198" localip="B.B.B.243" size="36968" user="-" host="A.A.A.198" method="GET" statuscode="200" reason="-" extra="-" exceptions="-" time="228876" url="/rest/documentConversion/latest/conversion/thumbnail/3899525/1" server="confluence.C.C" referer="confluence.C.C/.../editpage.action
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.927002 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Warning. Pattern match "(?i[[[[[[[[[[[:(]]]]]]]]]]][\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)([\\d\\w]++)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)(?[[[[[[[[[[[:(]]]]]]]]]]]?:=||r?like|sounds\\s+like|regexp)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)\\2|(?:!=|=|<>||\\^|is\\s+not|not\\ ..." at ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"] [line "77"] [id "950901"] [rev "2"] [msg "SQL Injection Attack: SQL Tautology Detected."] [data "Matched Data: t=\x22t found within ARGS:wysiwygContent:  
Recent space activ..."] [severity "CRITICAL"] [ver "OWAS [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.927684 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Warning. Pattern match "(?i[[[[[[[[[[[:(]]]]]]]]]]][\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)([\\d\\w]++)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)(?[[[[[[[[[[[:(]]]]]]]]]]]?:=||r?like|sounds\\s+like|regexp)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)\\2|(?:!=|=|<>||\\^|is\\s+not|not\\ ..." at ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"] [line "77"] [id "950901"] [rev "2"] [msg "SQL Injection Attack: SQL Tautology Detected."] [data "Matched Data: t=\x22t found within ARGS:wysiwygContent:  
Recent space activ..."] [severity "CRITICAL"] [ver "OWAS [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.928359 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Warning. Pattern match "(?i[[[[[[[[[[[:(]]]]]]]]]]][\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)([\\d\\w]++)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)(?[[[[[[[[[[[:(]]]]]]]]]]]?:=||r?like|sounds\\s+like|regexp)([\\s'\"`\xc2\xb4\xe2\x80\x99\xe2\x80\x98\\(\\)]*?)\\2|(?:!=|=|<>||\\^|is\\s+not|not\\ ..." at ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"] [line "77"] [id "950901"] [rev "2"] [msg "SQL Injection Attack: SQL Tautology Detected."] [data "Matched Data: t=\x22t found within ARGS:wysiwygContent:  
Recent space activ..."] [severity "CRITICAL"] [ver "OWAS [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.951019 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Warning. Pattern match "([\\~\\!\\@\\#\\$\\%\\^\\&\\*\\(\\)\\-\\+\\=\\{\\}\\[\\]\\|\\:\\;\"\\'\\\xc2\xb4\\\xe2\x80\x99\\\xe2\x80\x98\\`\\].*?){4,}" at ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"] [line "159"] [id "981173"] [rev "2"] [msg "Restricted SQL Character Anomaly Detection Alert - Total # of special characters exceeded"] [data "Matched Data:  
Recent space activity
Space contributors
 
 
Recent spac..."] [severity "CRITICAL"] [tag "OWASP_CRS/WEB_AT [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.961609 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Warning. Pattern match "(?i[[[[[[[[[[[:(]]]]]]]]]]]?:union\\s*?(?:all|distinct|[(!@]*?)?\\s*?[([]*?\\s*?select\\s+)|(?:\\w+\\s+like\\s+[\"'`\xc2\xb4\xe2\x80\x99\xe2\x80\x98])|(?:like\\s*?[\"'`\xc2\xb4\xe2\x80\x99\xe2\x80\x98]\\%)|(?:[\"'`\xc2\xb4\xe2\x80\x99\xe2\x80\x98]\\s*?like\\W*?[\"'`\xc2\xb4 ..." at ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"] [line "223"] [id "981245"] [msg "Detects basic SQL authentication bypass attempts 2/3"] [data "Matched Data: \x22>
 
Recent space a..."] [severity "CRITICAL"] [tag "OWASP_ [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.976647 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Rule a59b8f8 [id "981243"][file "/usr/apache/conf/waf/modsecurity_crs_sql_injection_attacks.conf"][line "245"] - Execution error - PCRE limits exceeded (-8): (null). [hostname "confluence.C.C"] [uri "/pages/doeditpage.action"] [unique_id "VjeuK9lkAPIAABsJ0D4AAAAR"]
2015:11:02-19:40:43 utm reverseproxy: [Mon Nov 02 19:40:43.977122 2015] [security2:error] [pid 6921:tid 3988700016] [client A.A.A.198] ModSecurity: Access denied with code 403 (phase 2). Pattern match "(.*)" at TX:950109-OWASP_CRS/PROTOCOL_VIOLATION/EVASION-ARGS:wysiwygContent. [file "/usr/apache/conf/waf/modsecurity_crs_inbound_blocking.conf"] [line "26"] [id "981176"] [msg "Inbound Anomaly Score Exceeded (Total Score: 64, SQLi=20, XSS=25): Last Matched Message: 981245-Detects basic SQL authentication bypass attempts 2/3"] [data "Last Matched Data:  
Recent space activity
confluence.C.C/.../editpage.action cookie="atlassian.xsrf.token=BUWG-DED7-ZRSB-M0PI|62eb8d0b9ee0563650a2d9ce71c5a0e1d1673334|lout; JSESSIONID=0A5DF167685410B8EE38BC2CAF6EC071; HASH_JSESSIONID=F1720F9CAFC622362FAFFD40A81C9FE1D7CD940D; confluence-sidebar.width=285" set-cookie="-">

Lots of references to SQLi and xrsf. So I switched off SQLI and XSS protection in the firewall profile. That didn't help, so I'm lost what I'm missing here.

For now I'm going to revert back to the basic protection profile and switching off the common threats filter. That's a bit disappointing.

This thread was automatically locked due to age.

0 Scott_Klassen over 9 years ago

Not every feature will work with every site, depends on the site coding. Nor individual rules. Looks like some false positive rules are being triggered, which is normal and expected when first using a site through WAF. The rules are generic and wide reaching and need to be tuned to your unique site. In the Firewall Profile that you are using, you can skip individual rules by rule ID.

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0 gcraenen over 9 years ago in reply to Scott_Klassen

I'll keep trying to find the right settings by enabling rules step-by-step. So far it looks that the website is usable when I disable protocol violations, XSS and SQLi. So I'll test a bit with those settings. Unfortunately those are the most tried attacks where a WAF should be for. So it kind of makes the use of this WAF not really usefull. I guess I'm better off installing a seperate WAF inside these sites.
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