0003330: Resin running in root (0) group although configured otherwise (WARNING: potential privilege escalation bug!)

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Category

Severity

Reproducibility

Date Submitted

Last Update

0003330

[Resin]

major

always

02-09-09 02:02

03-18-09 11:07

Reporter

tlandmann

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Platform

Status

closed

Projection

none

OS Version

ETA

none

Fixed in Version

4.0.0

Product Version

3.2.1

Product Build

Summary

0003330: Resin running in root (0) group although configured otherwise (WARNING: potential privilege escalation bug!)

Description

I run Resin as root with the following passage in the server-default section in resin.xml:

<resin:if test="${resin.userName=='root'}">
<user-name>httpd</user-name>
<group-name>httpd</group-name>
</resin:if>

Thus resin should run as user httpd in group httpd.

Then I run the following PHP file from within Quercus:

<?php
header("Content-Type: text/plain");
echo `id`;
?>

The output is:
uid=1003(httpd) gid=1003(httpd) groups=0(root)

The expected output would be:
uid=1003(httpd) gid=1003(httpd) groups=1003(httpd)

The problem means that although Resin is running as user httpd and primary group httpd, it still belongs to group root (!). This is dangerous! (!) There may be lots of sensitive files on a server system which may be read or even modified by members of the root group.
I didn't check if this access is actually possible. However I would assume it.

Fixing this bug is STRONGLY recommended for security reasons.

Steps To Reproduce

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Issue History
Date Modified	Username	Field	Change
02-09-09 02:02	tlandmann	New Issue
03-18-09 11:07	ferg	Assigned To	=> ferg
03-18-09 11:07	ferg	Status	new => closed
03-18-09 11:07	ferg	Resolution	open => fixed
03-18-09 11:07	ferg	Fixed in Version	=> 4.0.0

Mantis 1.0.0rc3[^]

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