The MITRE CVE dictionary describes this issue as:
Race condition in signal handling of procmail 3.20 and earlier, when running setuid, allows local users to cause a denial of service or gain root privileges by sending a signal while a signal handling routine is already running.
Red Hat security errata
|Red Hat Linux 5.2||RHSA-2001:093||July 19, 2001|
|Red Hat Linux 6.2||RHSA-2001:093||July 19, 2001|
|Red Hat Linux 7.0||RHSA-2001:093||July 19, 2001|
|Red Hat Linux 7.1||RHSA-2001:093||July 19, 2001|
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For clarification or corrections please contact the Red Hat Security Response Team.