Jan Braun has reported a vulnerability in fbida, which can be exploited by malicious, local users to perform certain actions on a vulnerable system with escalated privileges.
The "fbgs" script creates temporary files insecurely in the "/var/tmp" directory when the "TMPDIR" environment variable isn't defined. This can be exploited to create or overwrite arbitrary files via symlink attacks with the privileges of a user running the vulnerable script.
The vulnerability has been reported in versions 2.01 and 2.03. Other versions may also be affected.
Solution: Always define a secure directory in the "TMPDIR" environment variable before running the script.
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