Vulnerability CVE-2006-0805
Published: 2006-02-20   Modified: 2012-02-12

Description:
The CAPTCHA functionality in php-Nuke 6.0 through 7.9 uses fixed challenge/response pairs that only vary once per day based on the User Agent (HTTP_USER_AGENT), which allows remote attackers to bypass CAPTCHA controls by fixing the User Agent, performing a valid challenge/response, then replaying that pair in the random_num and gfx_check parameters.

See advisories in our WLB2 database:
Topic
Author
Date
Low
Bypassing CAPTCHA in phpNuke 6.x-7.9
waraxe
22.02.2006

Type:

CWE-Other

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Francisco burzi -> Php-nuke 

 References:
http://securityreason.com/securityalert/455
http://www.securityfocus.com/archive/1/425394/100/0/threaded
http://www.securityfocus.com/bid/16722
http://www.waraxe.us/advisory-45.html
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