Xmail: Privilege escalation through sendmail

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200512-05 / xmail
Release Date	December 14, 2005
Latest Revision	December 14, 2005: 01
Impact	high
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
mail-mta/xmail	< 1.22	>= 1.22	All supported architectures

Related bugreports: #109381

Synopsis

The sendmail program in Xmail is vulnerable to a buffer overflow, potentially resulting in local privilege escalation.

2. Impact Information

Background

Xmail is an Internet and intranet mail server.

Description

iDEFENSE reported that the AddressFromAtPtr function in the sendmail program 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.

Impact

A local attacker can make a malicious call to sendmail, potentially resulting in code execution with elevated privileges.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Xmail users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-mta/xmail-1.22"

4. References

Page updated December 14, 2005

Summary: This is a Gentoo Linux Security Advisory

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