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JavaMail Directory Traversal Vulnerability
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SUMMARY
The JavaMail API provides a platform-independent and protocol-independent
framework to build mail and messaging applications. The JavaMail API is
implemented as a Java platform optional package and is also available as
part of the Java 2 platform, Enterprise Edition.
The JavaMail API doesn't properly validate filename attribute in
Content-Disposition header, making it vulnerable to directory traversal
attacks. Successful exploitation of this vulnerability allows writing
arbitrary content in any directory accessible to the servlet running
JavaMail.
DETAILS
Vulnerable Systems:
* JavaMail version 1.3.2
MimeBodyPart.getFileName () method in the JavaMail API get the filename
associated with body part, if possible. The body part represents an
"attachment" that was loaded from a file. While in the documentation of
the function claims that the file name does not need to include path of
directory, it doesn't properly filter file name attribute in
Content-Disposition header, and it is possible to place a directory path
with the file name.
In order to exploit the problem, send an email with the following filename
attribute in Content-Disposition header:
./../../file.ext
This will write attachment three directories backward from expected
location, as long as the servlet processing the email has writable access
to that directory.
Example:
This method uses getFileName () method to save the first attachment into a
file:
protected void saveMailAttachment (javax.mail.internet.MimeMultipart mp) {
try {
int n = mp.getCount();
javax.mail.Part p = mp.getBodyPart (0);
String disposition = p.getDisposition ();
if (disposition != null && (disposition.equalsIgnoreCase
(javax.mail.Part.ATTACHMENT) || disposition.equalsIgnoreCase
(javax.mail.Part.INLINE) ) ) {
String filename = p.getFileName ();
File f = new File (filename);
OutputStream os = new BufferedOutputStream (new FileOutputStream (f)
);
InputStream is = p.getInputStream ();
int c;
while ( (c = is.read () ) != -1) os.write (c);
os.close ();
}
} catch (Exception e) { }
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:smcsoc@yahoo.es> Rafael San
Miguel Carrasco .
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