XMail is an Internet and intranet mail server. XMail sources compile
under GNU/Linux, FreeBSD, OpenBSD, NetBSD, OSX, Solaris and NT/2K/XP.
More information can be found at the vendor website:
Local exploitation of a buffer overflow vulnerability in XMail, as
distributed with multiple vendors' operating systems, allows local
attackers to execute arbitrary code with elevated privileges.
The vulnerability exists because of insufficent bounds checking on
user-supplied data. Specifically, the AddressFromAtPtr function fails to
check bounds on arguments passed from other functions, and as a result
an exploitable stack overflow condition occurs when specifying the "-t"
command line option. The "-t" command line option allows users to
specify the recipient value in the text of the message on a line
beginning with "To:". XMail passes the user-supplied value without
bounds checking to AdressFromAtPtr and attempts to store the hostname
portion of the e-mail address in a 256-byte buffer. Crafted e-mail
addresses can overflow the buffer and overwrite stack process control
data, resulting in local code execution with elevated privileges.
Successful exploitation will result in code execution with elevated
privileges. XMail is distributed in RPM, DEB and source format. The RPM
distribution installs the sendmail binary with setuid root privileges.
Exploitation of XMail installed from RPM will yield root. Other
distribution formats install the sendmail binary as setgid mail.
Exploitation resulting in group mail privileges will allow an attacker
to read all unencrypted mail stored locally in the system mail folders.
iDEFENSE Labs has confirmed the existence of this vulnerability in XMail
As a workaround solution, local mail delivery can be restricted and a
standard mail user-agent may be used to talk to the XMail SMTP server.
The vendor has released XMail 1.22 to address this issue which is
available for download at:
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-2943 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
10/12/2005 Initial vendor notification
10/12/2005 Initial vendor response
10/13/2005 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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Copyright © 2005 Verisign, Inc.
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