[SIG^2 G-TEC] SurgeMail Webmail Attachment Upload and XSS Vulnerabilities
SIG^2 Vulnerability Research Advisory
SurgeMail Webmail Attachment Upload and XSS Vulnerabilities
by Tan Chew Keong
Release Date: 23 Mar 2005
ADVISORY URL
http://www.security.org.sg/vuln/surgemail22g3.html
SUMMARY
SurgeMail (http://netwinsite.com/surgemail/) is a next generation Mail Server -
Combining features, performance and ease of use into a single integrated
product. Ideal on Windows NT/2K, or UNIX (Linux, Solaris etc) and supports all
the standard protocols IMAP, POP3, SMTP, SSL, ESMTP.
A vulnerability was found in SurgeMail's Webmail file attachment upload
feature. This vulnerability may be exploited by a malicious Webmail user to
upload files to certain locations on the server, obtain file listings of
certain directories, and/or send certain files on the server to him/herself.
Two XSS vulnerabilities were also found.
TESTED SYSTEM
SurgeMail Version 2.2g3 Windows on English Win2K SP4.
DETAILS
This advisory document two Webmail vulnerabilities found in SurgeMail server.
The first is a file attachment upload vulnerability. This vulnerability may be
exploited by a malicious Webmail user to upload files to certain locations on
the server, obtain file listings of certain directories, and/or send certain
files on the server to him/herself. The second is a Cross-Site Scripting (XSS)
vulnerability.
1. File Attachment Upload Vulnerability.
SurgeMail allows a logon user to attach files when composing a new email via
the Webmail interface. Uploaded file attachments are temporarily stored in the
c:\surgemail\web_work\u_xx\xxxx@hostname@127_0_0_1\attach\SomeRandomNumber\
directory. In particular, the value of SomeRandomNumber is part of this POST
request (attach_id parameter) and is under the attacker's control. The server
will create the directory "SomeRandomNumber" if it does not exist. By using
directory traversal characters, it is possible to cause the uploaded files to
be written to other directories.
2. Cross-Site Scripting (XSS) Vulnerabilities.
A user is allowed to configure an email auto-reply message using the Webmail
interface. This auto-reply message consist of a message subject and a message
header. It is possible to inject javascript in both these fields. If the
Webmail administrator views this user's auto-reply message settings, the
injected javascript will be executed on his browser. This may be exploited by a
malicious user to steal the Webmail administrator's cookies or to redirect the
administrator's browser to malicious websites.
Another XSS vulnerability occurs when webmail.exe is displaying an error
message in response to an invalid value in the page parameter. The error
message also reveals the installation path.
PATCH
Upgrade to the latest version of SurgeMail (Version 3.0c2 or later).
DISCLOSURE TIMELINE
18 Mar 05 - Vulnerability Discovered.
19 Mar 05 - Vulnerability Verification.
19 Mar 05 - Initial Vendor Notification.
22 Mar 05 - Vendor replied with fixed version.
23 Mar 05 - Public Release.
GREETINGS
All guys at SIG^2 G-TEC Lab
http://www.security.org.sg/webdocs/g-tec.html
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