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1.9 KiB
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45 lines
No EOL
1.9 KiB
Text
# Exploit Title: League of Legends Screensaver Unquoted Service Paths
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Conditional Privilege Escalation.
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# CVE-ID: NA
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# Date: 13/04/2016
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# Exploit Author: Vincent Yiu
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# Contact: vysec.private@gmail.com
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# Vendor Homepage: http://www.leagueoflegends.com
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# Software Link: screensaver.euw.leagueoflegends.com/en_US
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# Version: MD5 Hash: 0C1B02079CA8BF850D59DD870BC09963
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# Tested on: Windows 7 Professional x64 fully updated.
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1. Description:
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The League of Legends installer would install the League of Legends
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screensaver along with a service. The service would be called
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'lolscreensaver'. This particular service was misconfigured such that
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the service binary path was unquoted. When the screensaver is
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installed to 'C:\Riot Games', the issue is not exploitable. However,
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during the installation process, users are able to specify a directory
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to install to. When a user chooses to install this to say an external
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drive, this becomes exploitable.
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This was reported to Riot Games and has been rectified in the latest version.
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2. Proof
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http://i.imgur.com/S2fuUKa.png
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3. Exploit:
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Simply run 'sc qc lolscreensaver' and check for unquoted service path.
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If the path is unquoted, then check the permissions of each directory
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using space as a token.
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Eg. D:\My Games\Hidden Files\Super Secure\Riot Games\service\service.exe
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Do icacls on D:\, 'D:\My Games\', 'D:\My Games\Hidden Files\', 'D:\My
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Games\Hidden Files\Super Secure\'. If you are able to write files to
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any of these directories, it is exploitable.
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If 'D:\My Games\' is writable, to exploit this issue, place a binary
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to run as SYSTEM into the folder and named as 'Hidden.exe".
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This is released on exploit-db as a means to make users aware. There was no way to automatically install a patch or update to fix this issue. It is recommended that the screensaver is uninstalled and redownloaded from the official website where this issue is now resolved. |