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Help with ModSecurity

  • 28-10-2016 12:28pm
    #1
    [Deleted User]
    Posts: 11,614 ✭✭✭✭


    Ive got an issue with modsecurity and Im wondering if anyone can help. I'm running into an issue with uploading files to my application, anytime the file in question has a quote in the filename. Eventually I will do client side validation which will alert a user to a quote in the filename they are trying to upload and tell them to rename it, but for now I need to amend my modsecurity settings to ignore that particular check.

    The modsecurity rule is:
    SecRule MULTIPART_STRICT_ERROR "!@eq 0" \
"phase:2,t:none,log,deny,msg:'Multipart request body \
failed strict validation: \
PE %{REQBODY_PROCESSOR_ERROR}, \
BQ %{MULTIPART_BOUNDARY_QUOTED}, \
BW %{MULTIPART_BOUNDARY_WHITESPACE}, \
DB %{MULTIPART_DATA_BEFORE}, \
DA %{MULTIPART_DATA_AFTER}, \
HF %{MULTIPART_HEADER_FOLDING}, \
LF %{MULTIPART_LF_LINE}, \
SM %{MULTIPART_SEMICOLON_MISSING}, \
IQ %{MULTIPART_INVALID_QUOTING}, \
IH %{MULTIPART_INVALID_HEADER_FOLDING}, \
IH %{MULTIPART_FILE_LIMIT_EXCEEDED}'"

    The error Im getting is: 
    [2016-10-11T16:08:06.8336+01:00] [OHS] [ERROR:32] [OHS-9999] [blah.c]  [host_id: blah-web-kc1d] [host_addr: 1.2.3.4] [tid: 1724]  [user: SYSTEM] [ecid: 00ibIu6vODDF4ETzA8m3SD0000_^001B9G] [rid: 0]  [VirtualHost: main]  [client 1.2.3.4] ModSecurity: Access denied  with code 403 (phase 2). Match of "eq 0" against  "MULTIPART_STRICT_ERROR" required. [file  "E:/blah/security/blah_base_rules.conf"] [line "65"] [msg  "Multipart request body failed strict validation: PE 0, BQ 0, BW 0, DB  0, DA 0, HF 0, LF 0, SM , IQ 1, IH 0, IH 0"] [hostname  "www.dev.uk"] [uri  "/pls/dev/blah_details_form.process_blah"] [unique_id  "ZOMG!ROFL.TL;DR"]

    IQ 1 suggests its the invalid quoting which makes sense. How do I tell modsecurity, to not block when it detects invalid quoting, without disabling the rest of the rule?

    Thanks

    P.S. I know allowing quotes in a filename potentially introduces SQL injection, but we aren't worried about that for reasons I can't go into.


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