Larry Cashdollar has discovered a vulnerability in IBM Informix Dynamic Server, which can be exploited by malicious, local users to perform certain actions with escalated privileges.
The vulnerability is caused due to the temporary file "/tmp/installserver.txt" being created insecurely during the install process. This can be exploited via symlink attacks to append data to arbitrary files with privileges of the user running the installation script.
The vulnerability has been confirmed in version 10.UC3RC1 Trial for Linux. Other versions may also be affected.
Solution: Grant only trusted user access to affected systems.
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Subject: IBM Informix Dynamic Server Insecure Temporary File Creation
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