NERF Advisory #2 - 1C:Arcadia multiple vulnerablilities.

[ViperSV <vipersv () mail ru>]

                     --== NERF gr0up security advisory #2 ==--
    
      Multiple vulnerabilities in web-shop 1C: Arcadia, in module tradecli.dll

1. Show path scripts directory.

Exploit: http://host/scripts/tradecli.dll?template=nonexistfile

Will show error message, witch consist full path to work dir (usually /scripts).
Advice for developers: print this messages only to Event Log.

2. Read any file from drive.

Description:
tradecli.dll - language interpriteter of 1C: Arcadia. It will work up file, pointed in template, interpret
tags, bigining with underline sysmbol (example, <_include...>), all the rest read without changes, put in
ASCIIZ line and then print as result.

Path, pointed in variable template, will not work up for special symbols, so you can get direcory up
(..\) and the full path to file, you may read file only from drive, where lies work directory of 
tradecli.dll.

Exploit: http://host/script/tradecli.dll?template=..\..\..\..\..\path\to\file

Reading of binary files will be embarrassing, because data after 0
symbol will'nt print.

Advice for developers: check for existing file, pointed in template.
Advice for admins: limit perms for tradecli.dll

3. Crash ISAPI-applications (DoS)

Description:
Opening of files: com1, com2, etc. Windows NT application will crash,
that will crash all application (1C: Arcadia), consequently site.

Exploit:
http://host/scripts/tradecli.dll?template=com1
http://host/scripts/tradecli.dll?template=com2
http://host/scripts/tradecli.dll?template=com3
http://host/scripts/tradecli.dll?template=con
http://host/scripts/tradecli.dll?template=prn
http://host/scripts/tradecli.dll?template=aux

Advice for developers: in Windows system befor openning file, you
have to check file for existing (FindOpen etc.)
Advice for admins: wait for next release

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Bug found by buggzy, NERF Security gr0up, 2001
www.nerf.ru, buggzy () nerf ru