The MITRE CVE dictionary describes this issue as:
sudo 1.6.0 through 1.6.3p7 does not properly clear the environment before calling the mail program, which could allow local users to gain root privileges by modifying environment variables and changing how the mail program is invoked.
Red Hat security errata
|Red Hat Linux 7.0||RHSA-2002:011||January 15, 2002|
|Red Hat Linux 7.1||RHSA-2002:011||January 15, 2002|
|Red Hat Linux 7.2||RHSA-2002:011||January 15, 2002|
|Red Hat Powertools 6.2||RHSA-2002:013||January 15, 2002|
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For clarification or corrections please contact the Red Hat Security Response Team.