administrator/index.php in the installer component (com_installer) in Joomla! 1.5 Beta1, Beta2, and RC1 allows remote authenticated administrators to upload arbitrary files to tmp/ via the "Upload Package File" functionality, which is accessible when com_installer is the value of the option parameter.
CVSS Severity (version 2.0):
Impact Subscore: 9.2
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: High
Authentication: Required to exploit
Impact Type: Allows unauthorized modification; Allows disruption of service
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Patch Information; Exploit