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    Date: Ïò, 21 ÿíâ 2000  18:08:28

   Îò: valentijn <valentijn@MY.NET>

 Êîìó: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

 Òåìà: Strange behaviour IIS and RegExp

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Hai there!



The issue:

Crashing IIS using ordinary vbscript in an ASP page. Using Regular

expressions one can filter eg the contents of an HTML page. In this case i

was planning to filter some words. But some servers crashed on a not valid

regular expression when i pressed F5 in VID.



<%

Set fso = createobject("scripting.filesystemobject")

        Checkfile = server.MapPath("\") & "\index\mypage.html"

        mystring = fso.OpenTextFile ((checkfile)).ReadAll



        set myregexp = new regexp



        myregexp.Global = TRUE

        myregexp.IgnoreCase = true

        ' Normal regular expresion

        'myregexp.Pattern = "[A-Z0-9\.\-\_\ ]+"

        ' A not valid expression

        myregexp.Pattern = ".*"

        set mymatches =myregexp.Execute (mystring)



        for each thing in mymatches

                Response.Write thing

        next

%>



Results:

Winnt 4.0 Ent. sp5 IIS: (In the browser) a trappable error occured _or_ no

data is returned aka: normal reaction on invalid expression

Winnt 4.0 Ent. sp6 IIS: Inetinfo.exe crashes without any notice

Winnt 4.0 Ent. sp6a IIS:  Inetinfo.exe dies eventlog message:



An object call caused an exception.

(IID: {51372AEF-CAE7-11CF-BE81-00AA00A2FA25})

(Method: 3)

(Microsoft Transaction Server Internals Information: File:

i:\viper\src\runtime\mtxex\activity.cpp, Line: 889)

(Exception: C0000005)

(Address: 0x780015cc)

MSVCRT!wcslen + 0x4

vbscript + 0x2E4FB

vbscript + 0x1603





Access violation? No doc's in MS support database regarding Regexp or

i:\viper\src\runtime



Can anyone reproduce this?





Regards,



Valentijn Siebrands

Iam@my.net