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发表于 2020-11-1 00:00:00 | 显示全部楼层 |阅读模式
漏洞介绍:php是一款被广泛使用的编程语言,可以被嵌套在html里用做web程序开发,但是80sec发现在php的Mail函数设计上存在问题,可能导致绕过其他的如open_basedir等限制以httpd进程的身份读写任意文件,结合应用程序上下文也可能导致文件读写漏洞。漏洞分析:php的Mail函数在php源码里以如下形式实现:  Php 代码复制代码 ...... if (PG(safe_mode) && (ZEND_NUM_ARGS() == 5)) { php_error_docref(NULL TSRMLS_CC, E_WARNING, “SAFE MODE Restriction in effect. The fifth parameter is disabled in SAFE MODE.“); RETURN_FALSE; }   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “sss|ss“, &to, &to_len, &subject, &subject_len, &message, &message_len, &headers, &headers_len, &extra_cmd, &extra_cmd_len ) == FAILURE) { return; } ......   if (force_extra_parameters) { extra_cmd = estrdup(force_extra_parameters); } else if (extra_cmd) { extra_cmd = php_escape_shell_cmd(extra_cmd); }   if (php_mail(to_r, subject_r, message, headers, extra_cmd TSRMLS_CC)) { RETVAL_TRUE; } else { RETVAL_FALSE; } .....      ...... if (PG(safe_mode) && (ZEND_NUM_ARGS() == 5)) { php_error_docref(NULL TSRMLS_CC, E_WARNING, “SAFE MODE Restriction in effect. The fifth parameter is disabled in SAFE MODE.“); RETURN_FALSE; } if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “sss|ss“, &to, &to_len, &subject, &subject_len, &message, &message_len, &headers, &headers_len, &extra_cmd, &extra_cmd_len ) == FAILURE) { return; } ...... if (force_extra_parameters) { extra_cmd = estrdup(force_extra_parameters); } else if (extra_cmd) { extra_cmd = php_escape_shell_cmd(extra_cmd); } if (php_mail(to_r, subject_r, message, headers, extra_cmd TSRMLS_CC)) { RETVAL_TRUE; } else { RETVAL_FALSE; } ..... 在php_mail中  Php 代码复制代码 PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char *extra_cmd TSRMLS_DC) { .... FILE *sendmail; int ret; char *sendmail_path = INI_STR(“sendmail_path“); char *sendmail_cmd = NULL;   .... if (extra_cmd != NULL) { sendmail_cmd = emalloc (strlen (sendmail_path) + strlen (extra_cmd) + 2); strcpy (sendmail_cmd, sendmail_path); strcat (sendmail_cmd, “ “); strcat (sendmail_cmd, extra_cmd); } else { sendmail_cmd = sendmail_path; } .... /* Since popen() doesn\“t indicate if the internal fork() doesn\“t work * (e.g. the shell can\“t be executed) we explicitely set it to 0 to be * sure we don\“t catch any older errno value. */ errno = 0; sendmail = popen(sendmail_cmd, “w“);      PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char *extra_cmd TSRMLS_DC) { .... FILE *sendmail; int ret; char *sendmail_path = INI_STR(“sendmail_path“); char *sendmail_cmd = NULL; .... if (extra_cmd != NULL) { sendmail_cmd = emalloc (strlen (sendmail_path) + strlen (extra_cmd) + 2); strcpy (sendmail_cmd, sendmail_path); strcat (sendmail_cmd, “ “); strcat (sendmail_cmd, extra_cmd); } else { sendmail_cmd = sendmail_path; } .... /* Since popen() doesn\“t indicate if the internal fork() doesn\“t work * (e.g. the shell can\“t be executed) we explicitely set it to 0 to be * sure we don\“t catch any older errno value. */ errno = 0; sendmail = popen(sendmail_cmd, “w“); 如果是Linux系统,Mail函数将拼接INI_STR(”sendmail_path”)的内容和额外的参数来执行命令,但是额外的参数在拼接之前经过php_escape_shell_cmd的处理,所以我们无法执行额外的命令。但是通过查阅sendmail自身的命令帮助,我们可以发现sendmail的某些参数是可以用来读写文件的,利用这个特性如果我们控制第5个参数的时候我们一样可以获得对文件系统的读写权限并且不受open_basedir等限制。 漏洞测试:  Php 代码复制代码     本站内容均为原创,转载请务必保留署名与链接!php mail function open_basedir bypass:http://www.80sec.com/php-mail-function-open_basedir-bypass.html

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