Qmail email RCPT denial of service
| qmail-rcpt (208) |  Medium Risk |
Description:
The qmail server is vulnerable to a denial of service attack. By configuring the Threshold advanced parameter, an attacker can adjust the number of RCPTs that are legitimately allowed in a session. The default value for this parameter is 65535. An attacker can send an RCPT command with an extremely large number of recipients to the Qmail server to consume all memory resources on the server and crash the server.
Consequences:
Denial of Service
Remedy:
Upgrade to the latest version of qmail (1.03 or later), available from the qmail Web site. See References.
References:
- BugTraq Mailing List, 1997-06-12 7:04:01: Re: Denial of service (qmail-smtpd).
- D. J. Bernstein's Web site: Wietse Venema's slander.
- Qmail Mailing List: qmail-dos-2.c, another denial of service attack.
- Qmail Web site: qmail: a replacement for sendmail.
- BID-2237: QMail RCPT Denial of Service Vulnerability
- CVE-1999-0144: Denial of service in Qmail by specifying a large number of recipients with the RCPT command.
Platforms Affected:
- Compaq Tru64
- Dan Bernstein qmail 1.01
- Data General DG/UX
- IBM AIX
- Linux Kernel
- SCO SCO Unix
- SGI IRIX
- Sun Solaris
- WindRiver BSDOS
- HP-UX
Reported:
Jun 11, 1997
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