CVE Catalog

CVE-2006-0805

High
Published: Translated: NVD NIST

Summary

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 header. This 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.

Risk Assessment

The risk involves the possibility of automating attacks such as spam or brute-force that are normally blocked by CAPTCHA, potentially leading to abuse and system load.

Recommendation

Immediately update php-Nuke to the latest version or apply a patch that fixes the vulnerability. If an update is not possible, consider disabling CAPTCHA or replacing it with another verification mechanism.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS