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[SA14871] Linksys WET11 Password Change Security Bypass Vulnerability

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Apr 07 2005 - 07:53:46 CDT

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TITLE:
Linksys WET11 Password Change Security Bypass Vulnerability

SECUNIA ADVISORY ID:
SA14871

VERIFY ADVISORY:
http://secunia.com/advisories/14871/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
From local network

OPERATING SYSTEM:
Linksys WET11
http://secunia.com/product/645/

DESCRIPTION:
Kristian Hermansen has reported a vulnerability in Linksys WET11,
which can be exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to an error where the device password
can be changed without providing the old password. This can be
exploited to set a blank password and gain access to the device.

Example:
http://[victim]/changepw.html?data=........................

NOTE: In version 1.5.4, successful exploitation requires that a user
has logged in recently.

The vulnerability has been reported in version 1.5.4. Other versions
may also be affected.

SOLUTION:
Restrict access to the administrative web interface.

PROVIDED AND/OR DISCOVERED BY:
Kristian Hermansen

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