Title: InstantServer ISMail Remote User Fields Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
ISMail is a commercially available mail server implementation by InstantServers. It is available for the Microsoft Windows operating system.
A problem with ISMail could make it possible for a remote attacker to execute arbitrary code on systems using vulnerable software.
It has been reported that ISMail does not properly handle long strings under some circumstances. When an email containing specifically crafted strings in various fields of the email header is passed through the server, a buffer overflow occurs. This could be exploited to execute code on vulnerable server.
The problem is in the RCPT TO and FROM fields. When domain names of excessive length are supplied in these fields, a stack overflow occurs. This problem could be exploited to execute code with the privileges of the ISMail process, which is typically run as SYSTEM.
Affected Products:
- InstantServers ISMail 1.4.3
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