CVE-2014-7284

Published: 13 October 2014

The net_get_random_once implementation in net/core/utils.c in the Linux kernel 3.13.x and 3.14.x before 3.14.5 on certain Intel processors does not perform the intended slow-path operation to initialize random seeds, which makes it easier for remote attackers to spoof or disrupt IP communication by leveraging the predictability of TCP sequence numbers, TCP and UDP port numbers, and IP ID values.

From the Ubuntu Security Team

Tuomas Räsänen reported the Linux kernel on certain Intel processors does not properly initialize random seeds for network operations, causing TCP sequence numbers, TCP and UDP port numbers and IP ID values to be predictable. A remote attacker could exploit this flaw to spoof or disrupt IP communication.

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
per apw, this was fixed in passing in 3.13.0-39.66~precise1, part of
https://ubuntu.com/security/notices/USN-2394-1, but not documented in the changelog or
the USN.

Status

References

• http://secondlookforensics.com/ngro-linux-kernel-bug/
• https://ubuntu.com/security/notices/USN-2290-1
• https://ubuntu.com/security/notices/USN-2394-1
• https://ubuntu.com/security/notices/USN-2288-1
• https://www.cve.org/CVERecord?id=CVE-2014-7284
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1377339