The error_log function in basic_functions.c in PHP before 4.4.4 and 5.x before 5.1.5 allows local users to bypass safe mode and open_basedir restrictions via a "php://" or other scheme in the third argument, which disables safe mode.

References

• https://nvd.nist.gov/vuln/detail/CVE-2006-3011
• https://exchange.xforce.ibmcloud.com/vulnerabilities/27414
• http://cvs.php.net/viewvc.cgi/php-src/ext/standard/basic_functions.c?diff_format=u&view=log&pathrev=PHP_4_4
• http://cvs.php.net/viewvc.cgi/php-src/ext/standard/basic_functions.c?r1=1.543.2.51.2.9&r2=1.543.2.51.2.10&pathrev=PHP_4_4&diff_format=u
• http://secunia.com/advisories/20818
• http://secunia.com/advisories/21050
• http://secunia.com/advisories/21125
• http://secunia.com/advisories/21546
• http://securityreason.com/achievement_securityalert/41
• http://securityreason.com/securityalert/1129
• http://securitytracker.com/id?1016377
• http://www.mandriva.com/security/advisories?name=MDKSA-2006:122
• http://www.osvdb.org/26827
• http://www.php.net/release_5_1_5.php
• http://www.securityfocus.com/bid/18645
• http://www.ubuntu.com/usn/usn-320-1
• http://www.vupen.com/english/advisories/2006/2523