[ GLSA 200409-15 ] Webmin, Usermin: Multiple vulnerabilities in Usermin

[GLSA]

Gentoo Linux Security Advisory

Title: Webmin, Usermin: Multiple vulnerabilities in Usermin (GLSA 200409-15)
Severity: normal
Exploitable: remote
Date: September 12, 2004
Updated: May 22, 2006
Bug(s): #63167
ID: 200409-15

Synopsis


A vulnerability in the webmail function of Usermin could be used by an
attacker to execute shell code via a specially-crafted e-mail. A bug in the
installation script of Webmin and Usermin also allows a local user to
execute a symlink attack at installation time.


Background


Webmin and Usermin are web-based system administration consoles. Webmin
allows an administrator to easily configure servers and other features.
Usermin allows users to configure their own accounts, execute commands,
and read e-mail. The Usermin functionality, including webmail, is also
included in Webmin.


Affected Packages

Package: app-admin/usermin
Vulnerable: < 1.090
Unaffected: >= 1.090
Architectures: All supported architectures

Package: app-admin/webmin
Vulnerable: < 1.160
Unaffected: >= 1.160
Architectures: All supported architectures


Description


There is an input validation bug in the webmail feature of Usermin.

Additionally, the Webmin and Usermin installation scripts write to
/tmp/.webmin without properly checking if it exists first.


Impact


The first vulnerability allows a remote attacker to inject arbitrary
shell code in a specially-crafted e-mail. This could lead to remote
code execution with the privileges of the user running Webmin or
Usermin.

The second could allow local users who know Webmin or Usermin is going
to be installed to have arbitrary files be overwritten by creating a
symlink by the name /tmp/.webmin that points to some target file, e.g.
/etc/passwd.


Workaround


There is no known workaround at this time.


Resolution


All Usermin users should upgrade to the latest version: