This URL also causes Netscape 4.7 (Win 98) to crash when used as a location.. So if you embedded it into something, Javascript or otherwise, you could probably have some fun. NETSCAPE caused an invalid page fault in module <unknown> at 0000:2e2e2e2e. Registers: EAX=00000000 CS=015f EIP=2e2e2e2e EFLGS=00010246 EBX=0094a5d0 SS=0167 ESP=00b351c4 EBP=2e2e2e2e ECX=00000000 DS=0167 ESI=0000cc6a FS=1a6f EDX=81b1200c ES=0167 EDI=00b426c8 GS=0000 Bytes at CS:EIP: Stack dump: 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e 2e2e2e2e -- Anthony Benjamin [AB Computer Consulting] benjaminat_private http://www.powerweb.net/Nimajneb ----- Original Message ----- From: "Lark Lizerman" <webmasterat_private> To: <BUGTRAQat_private> Sent: Thursday, January 13, 2000 9:05 PM Subject: [BUGTRAQ] MS IIS 5.0 Access Violation on handling URL String Description: MS IIS 5.0 has problems handling a specific form of URL ending with "ida". The extension ida has been taken from the Bugtraq posting "IIS revealing webdirectories" The problem causes 2 kind of results. The one result is that the server responds with a message like "URL String too long"; "Cannot find the specified path" The other error causes the server to terminate with an Access Violation. When the server "Access violates" it displays as last message: File d:\http\.................................................................... ............................................................................ ............................................................................ ................................???????. Error 0xc0000005 caught while processing query Reproducing: As described above, the server gives out on one and the same string , 2+ error messages. The String will be hosted on an external site, so it doesn't produce too much email traffic for Bugtraq. You find the string at: www.packetshield.de/iisstring.txt (25KB) (Use Netscape Browser to view the file because MS IE5.0 has a bug preventing viewing txt files in one row what cuts of a large peace of the string. You can still view it with the "View source" of MS IE5.0. the last 3 bytes of the string are "ida", then the url is complete) As described above there are 2+ kinds of messages: 1)Access Violation with a display on the website you request 2)URL too long 3)Cannot find the specified path (3) output: File d:\http\.................................................................... ............................................................................ ............................................................................ ................................????. The system cannot find the path specified. With the one and the same string you get one of the 3 messages. The Access Violation error comes about every 20 times you request. (don't ask me why) I have 2 screenshots where 2 of the messages are displayed. The system I have tried it out is a cluster where each backups the other on case of failure. Because of that reason I can not guaranteed say if the process dies or not, because I got redirected to another server. The screenshots can be viewed at: http://www.packetshield.de/extra/crash1.jpg www.packetshield.de/extra/crash2.jpg Sorry the shots are so large (79,114KB, but Bitmap Editor can't compress better :-( ) I hope MS personal can fix that bug quickly because there is a chance of DoS'ing IIS Webservers, which have disabled "too long URL strings" One Server has too long URL check enabled and gives out a "warning". Temp. Solution: Enable IIS to check for too long URL strings and block them. I hope I didn't describe it to difficult, but I still prefer describing it instead of giving an exploit which can be used by every kid without understanding how it works and just doing damage ------------------------------- Lark Lizerman contact: lizermanat_private or lark82at_private -------------------------------
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:28:27 PDT
