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Multiple Vulnerabilities in RealArcade (Integer Overflow, Files Deletion)
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SUMMARY
<http://www.realarcade.com/> RealArcade is a software/portal developed by
RealNetworks for downloading and buying arcade games.
RealArcade contains two security vulnerabilities, one is an integer
overflow and the other is a file deletion vulnerabilit.
DETAILS
Vulnerable Systems:
* RealArcade version 1.2.0.994 and prior
Integer Overflow
The vulnerability lies in the handling of RGS files. Each RGS file is
defined using an integer of a 32 bits that specifies the length of a GUID
string and a name of a game to install.
When the user launches a RGS file he can choose if to continue installing
or not.
The vulnerability allows to overwrite the return address of the vulnerable
function which in turn can be used by an attacker to execute malicious
code.
Arbitrary File Deletion
The mechanism of the RGP files allows an attacker to also delete any file
on the victim's disk by simply using the content of RGP file containing a
tag followed by a filename with a directory traversal path.
Example:
..
<GAMEID>950258D1-7ABD-4afc-8886-449B98CE8224</GAMEID>
<VERSION>1.0 Demo RGI</VERSION>
<TYPE>demo</TYPE>
<GENRE>Puzzle and Board</GENRE>
<!-- now we exploit the directory traversal bug -->
<FILENAME>../../windows/calc.exe</FILENAME>
..
The problem is caused by the fact that RealArcade will truncate the file
(if it is present) to a 0 bytes size before it tries to write to it.
It appears that older versions could have been exploited using backslashes
while recent versions can be only exploited using forward slashes.
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@autistici.org> Luigi
Auriemma.
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