CVE-2014-0069

Published: 28 February 2014

The cifs_iovec_write function in fs/cifs/file.c in the Linux kernel through 3.13.5 does not properly handle uncached write operations that copy fewer than the requested number of bytes, which allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory corruption and system crash), or possibly gain privileges via a writev system call with a crafted pointer.

From the Ubuntu security team

Al Viro discovered an error in how CIFS in the Linux kernel handles uncached write operations. An unprivileged local user could exploit this flaw to cause a denial of service (system crash), obtain sensitive information from kernel memory, or possibly gain privileges.

Notes

android kernels (goldfish, grouper, maguro, mako and manta) are not
supported on the Ubuntu Touch 13.10 preview kernels

fix not yet in Linus's tree as of 2014-02-20

it seems the first fix is the CVE fix and will be: 5d81de8e8667da7135d3a32a964087c0faf5483f
the second patch is a nice to have for future issues
patch: http://article.gmane.org/gmane.linux.kernel.cifs/9401 (fixes bug)
patch: http://article.gmane.org/gmane.linux.kernel.cifs/9402 (hardening)

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0069
• http://article.gmane.org/gmane.linux.kernel.cifs/9401
• http://article.gmane.org/gmane.linux.kernel.cifs/9402
• https://ubuntu.com/security/notices/USN-2175-1
• https://ubuntu.com/security/notices/USN-2176-1
• https://ubuntu.com/security/notices/USN-2177-1
• https://ubuntu.com/security/notices/USN-2178-1
• https://ubuntu.com/security/notices/USN-2179-1
• https://ubuntu.com/security/notices/USN-2180-1
• https://ubuntu.com/security/notices/USN-2181-1
• https://ubuntu.com/security/notices/USN-2221-1
• https://ubuntu.com/security/notices/USN-2227-1
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2014-0069
• https://launchpad.net/bugs/1285051