FastStone 4in1 Browser Web Server Traversal Arbitrary File Access
Remote / Network Access
Loss of Confidentiality
FastStone 4in1 Browser contains a flaw that allows a remote attacker to access arbitrary files outside of the web path. The issue is due to the built-in web server not properly sanitizing user input, specifically traversal style attacks (../../) supplied via URI.
Upgrade to version 1.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
A vulnerability has been identified in the handling of certain types of requests by the 4in1 Browser Web server. Because of this, it is possible for an attacker to gain access to potentially sensitive system files.
This issue could be exploited to gain read access to files on a host using the vulnerable software. Read privileges granted to these files would be restricted by the permissions of the web server process.
This vulnerability is reported to affect FastStone 4in1 Browser version 1.2, previous versions might also be affected.
No exploit is required, the following examples are available:
It is reported that this issue is addressed in FastStone 4in1 Browser version 1.3. This is not confirmed.
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: email@example.com <mailto:firstname.lastname@example.org>.