Usermin 'maketemp.pl' Unsafe Temporary Directory Lets Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1011267 |
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SecurityTracker URL: http://securitytracker.com/id/1011267
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CVE Reference:
CAN-2004-0559
(Links to External Site)
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Date: Sep 14 2004
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Impact:
Modification of system information
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): prior to 1.089
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Description:
A vulnerability was reported in Usermin in the 'maketemp.pl' script. A local user may be able to gain elevated privileges.
The vendor reported that the script creates the '/tmp/.usermin' directory in an unsafe manner during installation. A local user can create a symbolic link (symlink) from a critical file on the system to the temporary directory name. Then, when Usermin is installed, the symlinked file will be overwritten.
According to Debian, Ludwig Nussel discovered this flaw.
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Impact:
A local user can obtain elevated (root) privileges on the target system.
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Solution:
The vendor has released a fixed version (1.090), available at:
http://www.webmin.com/index6.html
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Vendor URL: www.webmin.com/ (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS:
Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Tue, 14 Sep 2004 17:56:56 -0400
Subject: http://www.webmin.com/uchanges-1.089.html
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> Changes since Usermin version 1.080
> Usermin Core
> Fixed a security hole in the maketemp.pl script, used to create the /tmp/.usermin
> directory at install time. If an un-trusted user creates this directory before Webmin
> is installed, he could create in it a symbolic link pointing to a critical file on
> the system, which would be overwritten when Usermin writes to the link filename (CVE
> bug CAN-2004-0559).
According to Debian, Ludwig Nussel discovered this flaw.
http://www.webmin.com/changes-1.159.html
> Changes since Webmin version 1.150
> Webmin Core
[...]
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