Multiple buffer overflows in the metamail package could allow a remote attacker to execute arbitrary code on a vulnerable system. An attacker may be able to exploit these vulnerabilities via a specially-crafted email message.
The metamail package is one of the first widely adopted packages developed to handle Multipurpose Internet Mail Extensions (MIME) data, and includes a number of programs for handling various MIME types. Although it is mostly historic, it is still in wide deployment in many environments. Two buffer overflows due to incorrect use of strcpy() have been discovered in various portions of the metamail codebase. According to an analysis published by Ulf Härnhammar:
The first buffer overflow occurs when a message has encoded non-ASCII characters in the mail headers and the part that names a character set is overly long. The root of this problem is a bad strcpy() statement in the function PrintHeader() in metamail.c. [...]
An attacker may be able to execute code of their choosing on a vulnerable system by introducing a specially-crafted MIME attachment. The code would be executed in the context of the user who invoked the metamail program or mail handling program that launched metamail.
Apply a patch from the vendor
Thanks to Ulf Härnhammar for reporting this vulnerability.
This document was written by Chad R Dougherty.
|Date First Published:||2004-02-24|
|Date Last Updated:||2004-03-04 18:56 UTC|