The n_tty_write function in drivers/tty/n_tty.c in the Linux kernel through 3.14.3 does not properly manage tty driver access in the "LECHO & !OPOST" case, which allows local users to cause a denial of service (memory corruption and system crash) or gain privileges by triggering a race condition involving read and write operations with long strings.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2014-0196 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 5.
This issue affected the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 6 prior to version kernel-2.6.32-358.6.1.el6, released via RHSA-2013:0744 (https://rhn.redhat.com/errata/RHSA-2013-0744.html). That update added a backport of the upstream commit c56a00a165, which avoided this issue.
This flaw requires local system access to be exploited. We are currently not aware of any working exploit for Red Hat Enterprise Linux 6 or Red Hat Enterprise MRG 2.
| Base Score | 6.9 |
|---|---|
| Base Metrics | AV:L/AC:M/Au:N/C:C/I:C/A:C |
| Access Vector | Local |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | Complete |
| Integrity Impact | Complete |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux Extended Update Support 6.3 (kernel) | RHSA-2014:0512 | 2014-05-19 |
| Red Hat Enterprise Linux Advanced Update Support 6.2 (kernel) | RHSA-2014:0520 | 2014-05-20 |
| Red Hat Enterprise Linux 7 (kernel) | RHSA-2014:0678 | 2014-06-10 |
| Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) | RHSA-2014:0557 | 2014-05-27 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux Extended Update Support 6.4 | kernel | Affected |
| Red Hat Enterprise Linux 5 | kernel | Not affected |
Vulmon