Sendmail 8.8.8 to 8.12.7 Double Pipe Access Validation Vulnerability

Summary
smrsh (supplied by Sendmail) is designed to prevent the execution of commands outside of the restricted environment. However, when commands are entered using either double pipes or a mixture of dot and slash characters, a user may be able to bypass the checks performed by smrsh. This can lead to the execution of commands outside of the restricted environment.
Solution
upgrade to the latest version of Sendmail (or at least 8.12.8).