Title: Sendmail ETRN Denial of Service Vulnerability
Severity: HIGH
Description:
There is a low-bandwidth dos vulnerability in Sendmail. When a client connects to the sendmail smtpd and sends an ETRN command to the server, the server fork()s and sleeps for 5 seconds. If many ETRN commands are sent to a server, it is possible to exhaust system resources and cause a denial of service or even a reboot of the server.
Affected Products:
- Eric Allman Sendmail 8.9.1
- Eric Allman Sendmail 8.9.3
References:
- Sendmail Consortium: Sendmail Homepage
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