The MITRE CVE dictionary describes this issue as:
Sudo VISudo 1.6.8 and earlier allows local users to corrupt arbitrary files via a symlink attack on temporary files.
We do not consider this a security issue, the bug can only manifest if the software is invoked on a sudoers file that is contained in a world writable directory.
Red Hat security errata
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For clarification or corrections please contact the Red Hat Security Response Team.