Date: Mon, 17 Aug 2015 22:37:23 +0300 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: olivier@...tomlesspit.org, f.labreche@...il.com, cve-assign@...re.org Subject: Re: CVE request - simple-php-captcha - captcha bypass vulnerability On Mon, Aug 17, 2015 at 01:55:48PM -0400, cve-assign@...re.org wrote: > > https://github.com/claviska/simple-php-captcha/issues/16 > > Use 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
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