Multiple vendors' RADIUS implementations do not adequately validate user input thereby permitting DoS and arbitrary command execution via 'radiusd' daemon

Overview

Vulnerabilities in various implementations of the Remote Authentication Dial-In User Server (RADIUS) ‘radiusd’ daemon can allow an attacker to disrupt services or obtain unauthorized access.

Description

Various implementations of the Remote Authentication Dial-In User Server (RADIUS) ‘radiusd’ daemon may contain buffer-overflow, format-string, and other vulnerabilities.

CERT/CC has identified three potential buffer-overflow vulnerabilities in Merit 3.6b RADIUS. These vulnerabilities stem from calls to strcpy() without enforcing buffer size limits when managing the user_realm, id, and name input variables. Version 3.6b1 corrects these vulnerabilities and improves bounds checking in the packet_log function to prevent more buffer overflows. Interlink Networks found additional vulnerabilities that were not resolved in 3.6b1, and they have corrected these in version 3.6b2.

Lucent 2.1-2 RADIUS was patched by Simon Horms to replace dozens of calls to strcpy(), sprintf(), and other functions that are often linked to buffer-overflow, format-string, and other vulnerabilities.

The Lucent and Merit RADIUS implementations are both derived from work at Livingston Enterprises. They have evolved independently into significantly different codebases, so vulnerabilities fixed in either implementation may not have been present in the other. Nevertheless, given the shared roots of the two products, any vulnerability found in one may be present in the other or in other derivative RADIUS products. We are working with other vendors to learn whether their RADIUS products have similar vulnerabilities that have not yet been announced.

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Impact

Attackers who exploit these vulnerabilities may be able to interrupt RADIUS services or execute commands as the RADIUS user, which typically has administrator privileges. Loss or tampering of RADIUS services may prevent all access or allow unauthorized access to computer networks.

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Solution

Apply patches available from your vendor.

Patches for the Lucent implementation are available at:

<ftp://ftp.vergenet.net/pub/lucent_radius/&gt;

Merit offers patches to Merit RADIUS Server 3.6b1 at:

<ftp://ftp.merit.edu/radius/releases/&gt;

Interlink Networks offers its newer Merit RADIUS Server 3.6b2 at:

_<http://www.interlinknetworks.com/downloads/freeware_download_license.html&gt;_

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Vendor Information

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Interlink Networks __ Affected

Notified: July 16, 2001 Updated: August 07, 2001

Status

Affected

Vendor Statement

We have corrected all of these buffer overflow vulnerabilities and we are making this patch available on our Web site. The link to the patch on our Web site is:

<http://www.interlinknetworks.com/downloads/freeware_download_license.html>

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The vendor’s press release on the issue is available at

Merit Networks __ Affected

Notified: July 12, 2001 Updated: July 27, 2001

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

A patch is available at <ftp://ftp.merit.edu/radius/releases/&gt;

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23898931 Feedback>).

Simon Horms __ Affected

Notified: July 12, 2001 Updated: July 27, 2001

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Patches are available at <ftp://ftp.vergenet.net/pub/lucent_radius/&gt;

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23898931 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0534&gt;
• <http://www.securityfocus.com/bid/2991&gt;
• <http://www.securityfocus.com/bid/2989&gt;
• <ftp://ftp.vergenet.net/pub/lucent_radius/&gt;
• <ftp://ftp.vergenet.net/pub/lucent_radius/&gt;
• <ftp://ftp.merit.edu/radius/releases/&gt;
• <http://www.interlinknetworks.com/downloads/freeware_download_license.html&gt;

Acknowledgements

Thanks to Internet Security Systems X-Force for publishing an advisory on these vulnerabilities.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs:	CVE-2001-0534
Severity Metric:	20.11 Date Public: