#VU43083 Cryptographic issues in Linux kernel - CVE-2012-5375

Vulnerability identifier: #VU43083

Vulnerability risk: Medium

CVSSv4.0: 5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2012-5375

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.44, 3.1 - 3.1.10, 3.2 - 3.2.30, 3.3 - 3.3.8, 3.4 - 3.4.24, 3.5.1 - 3.5.7, 3.6.9 - 3.6.11, 3.7 - 3.7.9

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External links
https://crypto.junod.info/2012/12/13/hash-dos-and-btrfs/
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9c52057c698fb96f8f07e7a4bcf4801a092bda89
https://openwall.com/lists/oss-security/2012/12/13/20
https://www.kernel.org/pub/linux/kernel/v3.x/testing/patch-3.8-rc1.bz2
https://www.ubuntu.com/usn/USN-1944-1
https://www.ubuntu.com/usn/USN-1945-1
https://www.ubuntu.com/usn/USN-1946-1
https://www.ubuntu.com/usn/USN-1947-1
https://www.ubuntu.com/usn/USN-2017-1
https://github.com/torvalds/linux/commit/9c52057c698fb96f8f07e7a4bcf4801a092bda89

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.