4c9325d865
A malformed MIME structure with many parts can cause sendmail to crash while trying to send a mail due to a stack overflow, e.g., if the stack size is limited (ulimit -s). This happens because the recursion of the function mime8to7() was not restricted. The function is called for MIME 8 to 7 bit conversion and also to enforce MaxMimeHeaderLength. To work around this problem, recursive calls are limited to a depth of MAXMIMENESTING (20); message content after this limit is treated as opaque and is not checked further. |
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