Common Vulnerabilities and Exposures assigned an identifier CVE-2007-4783 to the following vulnerability: The iconv_substr function in PHP 5.2.4 and earlier allows context-dependent attackers to cause (1) a denial of service (application crash) via a long string in the charset parameter, probably also requiring a long string in the str parameter; or (2) a denial of service (temporary application hang) via a long string in the str parameter. NOTE: this might not be a vulnerability in most web server environments that support multiple threads, unless these issues can be demonstrated for code execution. References: http://www.securityfocus.com/archive/1/archive/1/478637/100/0/threaded
We do not consider these to be security issues. For more details see http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169857#c1 and http://www.php.net/security-note.php
Addresses in PHP 5.2.5 along with related CVE-2007-4840, patch: http://cvs.php.net/viewvc.cgi/php-src/ext/iconv/iconv.c?r1=1.153&r2=1.154 http://cvs.php.net/viewvc.cgi/php-src/ext/iconv/php_iconv.h?r1=1.32&r2=1.33