Secunia Logo  
 
FreeRADIUS EAP-MSCHAPv2 Authentication Bypass Vulnerability
Secunia Advisory: SA19300
Release Date: 2006-03-21
Last Update: 2006-03-27
Popularity: 10,675 views

Critical:
Less critical
Impact: DoS
Security Bypass
Where: From local network
Solution Status: Vendor Patch

Software:FreeRADIUS 1.x

Subscribe: Instant alerts on relevant vulnerabilities

CVE reference:CVE-2006-1354


Description:
A vulnerability has been reported in FreeRADIUS, which can be exploited by malicious people to cause a DoS (Denial of Service) and to bypass certain security restrictions.

The vulnerability is caused due to an input validation error in the EAP-MSCHAPv2 state machine. This can be exploited by manipulating the EAP-MSCHAPv2 state machine on a client system to bypass server authentication checks.

Successful exploitation may allow the attacker to gain network access without requiring knowledge of logon credentials or cause the server to crash.

The vulnerability has been reported in version 1.0.0 through 1.1.0.

Solution:
Update to version 1.1.1.
http://www.freeradius.org/getting.html

Provided and/or discovered by:
The vendor credits Steffen Schuster.

Changelog:
2006-03-22: Updated "Impact" and "Description" sections.
2006-03-27: Added CVE reference.

Original Advisory:
http://www.freeradius.org/security.html


Track this Secunia Advisory
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.

Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.

About this Secunia Advisory
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
  
Latest Advisories

Send Feedback to Secunia
If you have new information regarding this Secunia advisory or a product in our database, please send it to us using either our web form or email us at vuln@secunia.com.

Ideas, suggestions, and other feedback are most welcome.

Most Popular - 3 Hours

1. Drupal Project Module File Upload and Cross-Site Scripting // 94 views
2. Advanced Poll Multiple Vulnerabilities // 77 views
3. SAP GUI TabOne ActiveX Control Caption List Buffer Overflow // 74 views
4. SmbFTPD Long Command Processing Vulnerability // 62 views
5. Symantec Mail Security for SMTP Response Handling Denial of Service // 52 views
6. Drupal Project Issue Tracking Module Multiple Vulnerabilities // 41 views
7. Internet Explorer Data Binding Memory Corruption Vulnerability // 41 views
8. Debian update for iceape // 40 views
9. Cisco Global Site Selector DNS Request Denial of Service // 37 views
10. Joomla! "X_CMS_LIBRARY_PATH" Directory Traversal Vulnerability // 36 views