[linux-security] bug in su (Slackware 3.4)

Peter van Dijk (peter@ATTIC.VUURWERK.NL)
Sun, 15 Mar 1998 18:32:26 +0100

If sulog file logging is enabled in /etc/login.defs (shadowing installed!)
and su has never been used, a user can set his umask to 0 and then run su.
/var/log/sulog will then be created mode 666, which means user can use su
to try lots of passwords and then, when done, do something like
cat /dev/null > /var/log/sulog
and clear out the logfile.
Same goes for sudo.
Note: everything will still be logged in syslog (unless disabled!)

Greetz, Peter.

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'Selfishness and separation have led me to . Peter 'Hardbeat' van Dijk
to believe that the world is not my problem . network security consultant
I am the world. And you are the world.' . (yeah, right...)
Live - 10.000 years (peace is now) . peter@attic.vuurwerk.nl
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6:25pm up 1 day, 4:22, 5 users, load average: 0.69, 0.22, 0.07
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