In vixie-cron, SUID crontab prevents crontab editing if /etc/cron.allow is empty. If you force the ulimit for open files to be 4, auth check is bypassed but you hit another error lower down :( $ bash -c 'ulimit -n 4; crontab newtab' /var/spool/cron/: mkstemp: Too many open files
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Normally it would say this: $ crontab newtab You (grant) are not allowed to use this program (crontab) See crontab(1) for more information
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This is the allowed check that is passed to the lack of error handling on fopen: https://github.com/svagner/vixie-cron/blob/13d13f0b38d73e7a415caa77b5821be92dd16f70/misc.c#L462 … And this is as far as the program gets with the new ulimit: https://github.com/svagner/vixie-cron/blob/13d13f0b38d73e7a415caa77b5821be92dd16f70/crontab.c#L845 …
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Looks like a bug, and almost a vulnerability, but not quite. Maybe some better pwners can take this to an exploit?
Čini se da učitavanje traje već neko vrijeme.
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