Title: Vixie Cron MAILTO Sendmail Vulnerability
Severity: HIGH
Description:
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.
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.
Affected Products:
- Caldera OpenLinux 2.2.0
- Conectiva Linux 6.0.0
- Conectiva Linux 7.0.0
- Conectiva Linux 8.0.0
- Debian Linux 2.1.0
- Debian Linux 2.2.0
- Debian Linux 2.2.0 68k
- Debian Linux 2.2.0 alpha
- Debian Linux 2.2.0 arm
- Debian Linux 2.2.0 powerpc
- Debian Linux 2.2.0 sparc
- Paul Vixie Vixie Cron 3.0.0 pl1
- Progeny Debian 1.0.0
- RedHat Linux 4.0.0
- RedHat Linux 4.1.0
- RedHat Linux 4.2.0
- RedHat Linux 5.0.0
- RedHat Linux 5.1.0
- RedHat Linux 5.2.0 i386
- RedHat Linux 6.0.0
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