Webmin contains input validation vulnerabilities

Overview

Webmin 1.580, and possibly earlier versions, has been reported to contain input validation vulnerabilities.

Description

The advisories from American Information Security Group report the following vulnerabilities.

CWE-20: Improper Input Validation - CVE-2012-2981
“An input validation flaw allows for authenticated users to execute arbitrary Perl statements, commands, or libraries by parsing any file provided.”

CWE-77:Improper Neutralization of Special Elements used in a Command- CVE-2012-2982
“An input validation flaw within /file/show.cgi allows for authenticated users to execute arbitrary system commands as a privileged user. Additionally, anyone with a previously established session can be made to execute arbitrary commands on the server by embedding the attack in HTML code–such as IMG SRC tags within HTML emails.”

CWE-22:Improper Limitation of a Pathname to a Restricted Directory- CVE-2012-2983
“A directory traversal flaw within edit_html.cgi allows an attacker to view any file as user root.”

Full details of each vulnerability are available in the American Information Security Group advisories linked in the References section.

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Impact

An authenticated attacker may be able to execute arbitrary commands.

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Solution

We are currently unaware of a practical solution to this problem. The vendor is aware of the vulnerabilities and has patches available in the development branch but an official version including the patches was not available at the time of publication.

Patch for CVE-2012-2981
<https://github.com/webmin/webmin/commit/ed7365064c189b8f136a9f952062249167d1bd9e&gt;

Patch for CVE-2012-2982
<https://github.com/webmin/webmin/commit/1f1411fe7404ec3ac03e803cfa7e01515e71a213&gt;

Patch for CVE-2012-2983
<https://github.com/webmin/webmin/commit/4cd7bad70e23e4e19be8ccf7b9f245445b2b3b80&gt;

Please consider the following workarounds.

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Restrict access

As a general good security practice, only allow connections from trusted hosts and networks. Restricting access would prevent an attacker from accessing Webmin using stolen credentials from a blocked network location.

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Vendor Information

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Webmin Affected

Notified: July 10, 2012 Updated: September 05, 2012

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	8.5	AV:N/AC:M/Au:S/C:C/I:C/A:C
Temporal	6.9	E:POC/RL:TF/RC:C
Environmental	5.2	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <http://www.webmin.com/&gt;
• <https://github.com/webmin/webmin/commit/ed7365064c189b8f136a9f952062249167d1bd9e&gt;
• <https://github.com/webmin/webmin/commit/1f1411fe7404ec3ac03e803cfa7e01515e71a213&gt;
• <https://github.com/webmin/webmin/commit/4cd7bad70e23e4e19be8ccf7b9f245445b2b3b80&gt;
• <http://americaninfosec.com/research/index.html&gt;
• <http://www.americaninfosec.com/research/dossiers/AISG-12-000.pdf&gt;
• <http://www.americaninfosec.com/research/dossiers/AISG-12-001.pdf&gt;
• <http://www.americaninfosec.com/research/dossiers/AISG-12-002.pdf&gt;

Acknowledgements

Thanks to the American Information Security Group for reporting this vulnerability.

This document was written by Jared Allar.

Other Information

CVE IDs:	CVE-2012-2981, CVE-2012-2982, CVE-2012-2983
Date Public:	2012-09-06 Date First Published: