SB2013021802 - Cryptographic issues in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Cryptographic issues (CVE-ID: CVE-2012-5375)

CWE-ID: CWE-310 - Cryptographic Issues

CVSSv4: 5.9 [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]

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.

Remediation

Install update from vendor's website.

References

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