Describe CVE-2021-45448.
What is CVE-2021-45448?
Pentaho Business Analytics
 Server versions before 9.2.0.2 and 8.3.0.25 using the Pentaho 
Analyzer plugin exposes a service endpoint for templates which allows a 
user-supplied path to access resources that are out of bounds. 

The software uses external input to construct a pathname that is intended to identify a file or 
directory that is located underneath a restricted parent directory, but the software does not 
properly neutralize special elements within the pathname that can cause the pathname to 
resolve to a location that is outside of the restricted directory.  By using special elements such as 
".." and "/" separators, attackers can escape outside of the restricted 
location to access files or directories that are elsewhere on the 
system.



.