Access Controls Bypass

The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. * A flaw was found in the way the Linux kernel’s TCP/IP protocol suite implementation handled sending of certain UDP packets over sockets that used the UDP_CORK option when the UDP Fragmentation Offload (UFO) feature was enabled on the output device. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges on the system. (CVE-2013-4470, Important) * A flaw was found in the way the perf_trace_event_perm() function in the Linux kernel checked permissions for the function tracer functionality. An unprivileged local user could use this flaw to enable function tracing and cause a denial of service on the system. (CVE-2013-2930, Moderate) * A flaw was found in the way the net_ctl_permissions() function in the Linux kernel checked access permissions. A local, unprivileged user could potentially use this flaw to access certain files in /proc/sys/net regardless of the underlying file system permissions. (CVE-2013-4270, Moderate) * A flaw was found in the way the Linux kernel’s Adaptec RAID controller (aacraid) checked permissions of compat IOCTLs. A local attacker could use this flaw to bypass intended security restrictions. (CVE-2013-6383, Moderate) * A flaw was found in the way the get_dumpable() function return value was interpreted in the ptrace subsystem of the Linux kernel. When ‘fs.suid_dumpable’ was set to 2, a local, unprivileged local user could use this flaw to bypass intended ptrace restrictions and obtain potentially sensitive information. (CVE-2013-2929, Low) * An invalid pointer dereference flaw was found in the Marvell 8xxx Libertas WLAN (libertas) driver in the Linux kernel. A local user able to write to a file that is provided by the libertas driver and located on the debug file system (debugfs) could use this flaw to crash the system. Note: The debugfs file system must be mounted locally to exploit this issue. It is not mounted by default. (CVE-2013-6378, Low) * A NULL pointer dereference flaw was found in the Linux kernel’s IPv6 source address-based routing implementation. A local attacker who has the CAP_NET_ADMIN capability could use this flaw to crash the system. (CVE-2013-6431, Low) Red Hat would like to thank Hannes Frederic Sowa for reporting CVE-2013-4470. The CVE-2013-4270 issue was discovered by Miroslav Vadkerti of Red Hat. This update also fixes multiple bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section. Users should upgrade to these updated packages, which upgrade the kernel-rt kernel to version kernel-rt-3.8.13-rt27, correct these issues, and fix the bugs noted in the Red Hat Enterprise MRG 2 Technical Notes. The system must be rebooted for this update to take effect.