由团队研究发现的PHP CGI在平台的远程代码执行漏洞CVE - 2024 - 4577被本文进行了分析, 探讨了该漏洞的技术细节, 其背景如何, 利用条件怎样, 还有针对此漏洞给出了修复建议。PHP官方团队在2024年6月6日的时候发布了新版本来修复CVE - 2024 - 4577, 此漏洞利用前置的条件相对比较低且危害程度较大, 所以建议尽快升级到安全版本。0x00 漏洞概述CVE - 2024 - 4577, 这是一个存在的漏洞, 其所影响的对象, 是在特定平台之上运行的PHP CGI, 而且, 这是一个关于远程代码执行方面的漏洞。之所以存在漏洞, 是由于PHP在进行设计期间, 没能预先想到Best - Fit字符编码转换特性, 借此攻击者能够经由构造特定请求绕过安全限制, 受影响的环境涵盖运用特定语系设置的系统, 像简体中文936、繁体中文950以及日文932这样的情况。0x01 影响范围PHP 8.3 8.3.8PHP 8.2 8.2.20PHP 8.1 8.1.29官方对于其他版本的PHP, 已不再进行维护, 要依据实际情况去进行判断后, 升级到安全版本, 或是将php - cgi这款程序对其使用方面进行关闭使用操作, 请注意。0x02 复现采用php://input这个流, 去接收经由POST请求传递进来的参数, 以此达成RCE。{host}/php-cgi/php-cgi.exe?%ADdcgi.force_redirect%3d0%ADdcgi.redirect_status_env%ADdallow_url_include%3d1%ADdauto_prepend_file%3dphp://input0x03 漏洞背景PHP所具备的SAPI, 乃是PHP专门用以在不一样的服务器环境当中运行而予以提供的一整套应用程序编程接口。SAPI对PHP怎样同其所处环境下的Web服务器或者其他类别的服务器展开交互做出了定义。简单概括来讲, SAPI就是PHP跟服务器软件进行通信的桥梁。在PHP中通常有三种主流的SAPI实现方式PHP - FPM这样的一种东西, 它属于一种协议的解析器, 其主要承担的任务是, 接收源自Web服务器经过按照协议格式封装得来的请求数据, 再把这些数据传递给PHP解释器去做处理。这是服务器的一个模块, 它专门用来处理数据交换工作, 此工作是在PHP和某个对象之间进行的。PHP - CGI, 它有着两种模式的交互能力, 其运行模式既可是作为CGI程序, 也能够是以作为服务的形式来运行的, PHP - CGI在以CGI模式进行运行期间, 出现了安全漏洞CVE - 2012 - 1823。发现漏洞的团队也用了这个趣图来比喻这三种SAPI。回头去看那CVE - 2012 - 1823 , 此乃PHP在CGI环境之下的安全方面的缺陷之处, Web服务器会把HTTP请求解析完毕之后再转发给PHP脚本, 以其作为例子来说 , 该请求在命令行当中或许以php.exe cgi.php a b这样的形式去被处理。依据的规范, 要是查询字符串当中缺少了未被解码的等号, 那时整个查询字符串理应被视作CGI的参数来进行传递。这就意味着, 若是URL里的查询字符串部分省略了等号, 它会在未经恰当处理的状况下被传递给php - cgi , 从而给攻击者提供了注入非法命令行参数的契机。想要有效利用这一漏洞, 就得了解php - cgi支持哪些命令行参数。借助-d参数去指定配置项的值以实现RCE: 一旦选项被设定为On, PHP便会允许包含经由URL指明的文件, %3dphp%3a//input: 即此参数对配置项进行设置, 令其指向php://input流。这个具备读取借助POST方法发送至脚本的原始数据能力的php://input流。因设置此项配置后, 意味着攻击者能够操控PHP脚本执行前自动包含的文件, 实际就是包含了借助POST发送过来的数据。0x04 漏洞原理CVE - 2024 - 4577是借助系统里字符编码转换的Best - Fit特性来对CVE - 2012 - 1823实行绕过, 该系统里字符编码转换的Best - Fit特性是操作系统于处理不同字符编码集间的转换之际所运用的一种匹配机制, 当系统中有无法直接映射到目标编码集的字符时, Best - Fit特性要尝试找寻一个比如语义或外观上最接近的字符来用以替代显示或者处理。这样的特性于多语言支持以及国际化软件的开发里头极为关键, 缘由是能够提升不同语言环境之下用户界面的可读性与一致性, 可是在某些情形当中, Best - Fit特性也有可能致使安全方面的隐患产生, 特别是在应对源自不可信源头的输入之际。例如, 在Web应用里, 要是攻击者可以借助Best - Fit特性, 把特殊字符转变为有着不同语义的字符, 那就有可能避开安全检查, 进而致使安全漏洞出现, 像这次的CVE - 2024 - 4577便是利用了%ad这个特殊字符, 借助Best - Fit匹配到的是连字符-。查看这次补丁的来分析为什么是连字符-https://github.com/php/php-src/commit/4dd9a36c16#diff-680b80075cd2f8c1bbeb33b6ef6c41fb1f17ab98f28e5f87d12d82264ca99729R1798PHP的源代码里, 原先就已经达成了针对特定字符, 像连字符 - 的过滤逻辑, 这属于对CVE - 2012 - 1823的修复代码, 如下所示是CVE - 2012 - 1823的poc, 将其与CVE - 2024 - 4577的poc对照时能够发现, 主要差别在于, 连字符 - 变成了%AD。经由运用%ad去替代常规的连字符-, 从而绕过了原本理应阻止参数传递的安全机制, 致使攻击者得以成功注入并执行非法的参数, 为修复CVE - 2024 - 4577, 于最新的代码更新里, 鉴于系统中Best - Fit特性的影响, 把所有高于0x80的字符也纳入了限制范围, 代码注释中针对此也做了详细说明, 阐述了采取这一措施的背景。于CVE - 2024 - 4577的poc里头, 能够瞧见多了一项参数选项cgi. , 鉴于PHP增添了一项默认开启的配置cgi.1 , 仅准许经由重定向规则的请求去执行PHP CGI, 不准许直接访问执行, 若要绕过这一特性, 能够采取以下办法:因为已然借助 -d 参数顺利更改了别的配置, 所以同样能够径直运用 -d 参数把 cgi. 的值变为 0, 进而关掉这一重定向规则限定。默认配置的XAMPP受影响的原因存在这样的配置项, 其在 conf 这个文件夹里面的 extra 文件夹当中的 httpd - xampp.conf 文件里。ScriptAlias /php-cgi/ /xampp/php/AllowOverride NoneOptions NoneRequire all deniedRequire all granted其意义在于, 当用户对网站的/php-cgi/路径发起访问行为的时候, 会把请求映射到本地的/xampp/php/这个目录, 此目录涵盖了PHP环境的全部文件及组件, 并且在该被提及的目录之下偏偏就有php-cgi.exe程序。当我们使用最早公开的poc发现并不能复现/cgi-bin/php-cgi.exe?%ADdallow_url_include%3d1%ADdauto_prepend_file%3dphp://input/php-cgi/php-cgi.exe?%ADdallow_url_include%3d1%ADdauto_prepend_file%3dphp://input其原因在于, 要验证请求乃是借助Web服务器的指令予以发起的, 并非是用户直接针对php - cgi展开的请求php - cgi设置了名为“cgi.”的这一安全特性。此特性默认处于开启状态, 它能够确保唯有遵循特定重定向流程的请求才会被php - cgi所处理, 如此一来便能够有效规避直接针对php - cgi的潜在不当访问, 所以在POC当中添加 - d cgi.0去关闭这个校验规则, 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