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Re: ASP script using OpenTextFile
From: Cael Abal <lists2 () onryou com>
Date: Mon, 08 Mar 2004 21:58:57 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Paul Tinsley wrote:
Need some help from those out there versed in windows. I am auditing an ASP based (VBScript) application which uses OpenTextFile as follows: Set f = fso.OpenTextFile(sLeadingPath + paramPageToRender + ".xsl", ForReading) I have been able to ../../../../ all over the place, but it only allows me to pick up files ending with .xsl. I would like to print the contents of a non .xsl file to prove that not checking paths properly is a large issue. But I have had no luck making it ignore the .xsl I have tried ../../foo.txt%00 ../../foo.txt%0a ../../foo.txt%0d. But none of these seem to be working for me, does anyone know of a good way to end the file where I want and have it ignore the .xsl tacked on the end of the filename to be opened? Any help is greatly appreciated.
Hi Paul, You're right to raise concerns about this sort of code. Consider this example: - ---snip--- sLeadingPath = "C:\" paramPageToRender = "passwords.txt" + Chr(0) set fso = CreateObject("Scripting.FileSystemObject") set f = fso.OpenTextFile (sLeadingPath + paramPageToRender + ".xsl", 1) WScript.echo (f.ReadAll) - ---snip--- You had the right idea, you only needed to figure out how VBS represents \0. As you know, because strings are terminated with the null character, the final string concatenation performed within OpenTextFile() is disregarded. Cheers, Cael (Heh, fear my leet VBS skills.) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (MingW32) iD8DBQFATTLwR2vQ2HfQHfsRAvt1AKC2yNAhgIv/LS3EI9WOlS5PG2HzjQCg5hWV QzwMDxw5ZomAit0gkj7Qga8= =qiN/ -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- ASP script using OpenTextFile Paul Tinsley (Mar 08)
- Re: ASP script using OpenTextFile Cael Abal (Mar 08)
- Re: ASP script using OpenTextFile Cael Abal (Mar 08)
- Re: ASP script using OpenTextFile Cael Abal (Mar 08)