oss-sec mailing list archives
Re: CVE request - simple-php-captcha - captcha bypass vulnerability
From: Solar Designer <solar () openwall com>
Date: Mon, 17 Aug 2015 22:37:23 +0300
On Mon, Aug 17, 2015 at 01:55:48PM -0400, cve-assign () mitre org wrote:
https://github.com/claviska/simple-php-captcha/issues/16Use CVE-2015-6250 for the original issue that the "srand(microtime() * 100)" call is counterproductive because, especially in cases of good time synchronization, the client is able to run the same srand call as the server.
FWIW, time synchronization was irrelevant. The original report said: "Since microtime() is used both in the initial seed for the captcha and in the captcha url path sent to the client, [...]" This is referring to: $image_src = substr(__FILE__, strlen( realpath($_SERVER['DOCUMENT_ROOT']) )) . '?_CAPTCHA&t=' . urlencode(microtime()); Alexander
Current thread:
- CVE request - simple-php-captcha - captcha bypass vulnerability François Labrèche (Aug 09)
- Re: CVE request - simple-php-captcha - captcha bypass vulnerability Solar Designer (Aug 09)
- Re: CVE request - simple-php-captcha - captcha bypass vulnerability cve-assign (Aug 17)
- Re: CVE request - simple-php-captcha - captcha bypass vulnerability Solar Designer (Aug 17)