Title: RedHat Linux diskcheck Race Condition Vulnerability
Severity: LOW
Description:
diskcheck.pl is a perl script included as part of the Red Hat Powertools suite, distributed by Red Hat Inc. A condition exists which could allow a user to corrupt arbitrary files on the system.
The problem occurs in the creation of a file in the /tmp file system. diskcheck.pl is run hourly, and is designed to send an email to the administrator of the system if any filesystem on the system reaches 90% capacity. The mail generated is moved to a file in /tmp labelled diskusagealert.txt.$$, with $$ representing the process number of the job. Due to the design, it is possible for a malicious user to create a symbolic link to another file on the system to which write access is not permitted, and corrupt the integrity of the linked file.
Affected Products:
- RedHat Linux 6.0.0
- RedHat Linux 6.0.0 alpha
- RedHat Linux 6.0.0 sparc
- RedHat Linux 6.1.0 alpha
- RedHat Linux 6.1.0 i386
- RedHat Linux 6.1.0 sparc
- RedHat Linux 6.2.0 alpha
- RedHat Linux 6.2.0 i386
- RedHat Linux 6.2.0 sparc
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