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CVE-2014-0196

Vincent (CVE) Danen's picture
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.

Details Source

Mitre

Statement

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.

Public Date

2014-05-01 00:00:00

Impact

Important

Bugzilla

CVE-2014-0196 kernel: pty layer race condition leading to memory corruption

Bugzilla ID

1 094 232

CVSS Status

verified

Base Score

6.90

Base Metrics

AV:L/AC:M/Au:N/C:C/I:C/A:C

Red Hat Security Errata

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
MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2014:0557 2014-05-27

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 realtime-kernel Affected
Red Hat Enterprise Linux Extended Update Support 6.4 kernel Affected
Red Hat Enterprise Linux 5 kernel Not affected