Advisories ยป MGASA-2018-0107

Updated kernel packages fix security vulnerabilities

Publication date: 05 Feb 2018
Modification date: 05 Feb 2018
Type: security
Affected Mageia releases : 5
CVE: CVE-2017-5715 , CVE-2017-5753 , CVE-2017-8824 , CVE-2017-16911 , CVE-2017-16912 , CVE-2017-16913 , CVE-2017-16914 , CVE-2017-1000410

Description

This kernel update is based on the upstream 4.4.114 and and fixes
several security issues.

The most important fixes in this update is for the security issue named
"Spectre, variant 2 (CVE-2017-5715)" that is partly mitigated by enabling
retpoline support. For full retpoline mitigation, kernel needs to be built
with a retpoline-aware cpmpiler, something that wont happend in Mga5 as
Mageia 5 has reached End of Support at December 31st, 2017 (even if we
have been providing some extended support due to Meltdown/Spectre issues.
If you want to receive further fixes regarding theese issues, you really
need to upgrade to Mageia 6.

The BPF interpreter has been used as part of the spectre 2 attack
CVE-2017-5715. To make attacker job harder introduce BPF_JIT_ALWAYS_ON
config option that removes interpreter from the kernel in favor of JIT-only
mode. Note: In Mageia 5 we have BPF disabled by default, so it's not
really an issue, but the fixes are still needed in case someone enables it 

KVM on x86 gained a memory barrier on vmcs field lookup as part of
mitigating Spectre variant 2 (CVE-2017-5753).

Other security fixes in this update:

The vhci_hcd driver in the Linux Kernel before version 4.14.8 and 4.4.114
allows allows local attackers to disclose kernel memory addresses.
Successful exploitation requires that a USB device is attached over IP
(CVE-2017-16911).

The "get_pipe()" function (drivers/usb/usbip/stub_rx.c) in the Linux
Kernel before version 4.14.8, 4.9.71, and 4.4.114 allows attackers to
cause a denial of service (out-of-bounds read) via a specially crafted
USB over IP packet (CVE-2017-16912).

The "stub_recv_cmd_submit()" function (drivers/usb/usbip/stub_rx.c) in the
Linux Kernel before version 4.14.8, 4.9.71, and 4.4.114 when handling
CMD_SUBMIT packets allows attackers to cause a denial of service (arbitrary
memory allocation) via a specially crafted USB over IP packet
(CVE-2017-16913).

The "stub_send_ret_submit()" function (drivers/usb/usbip/stub_tx.c) in the
Linux Kernel before version 4.14.8, 4.9.71, 4.1.49, and 4.4.107 allows
attackers to cause a denial of service (NULL pointer dereference) via a
specially crafted USB over IP packet (CVE-2017-16914).

Linux kernel version 3.3-rc1 and later is affected by a vulnerability lies
in the processing of incoming L2CAP commands - ConfigRequest, and
ConfigResponse messages. This info leak is a result of uninitialized stack
variables that may be returned to an attacker in their uninitialized state.
By manipulating the code flows that precede the handling of these
configuration messages, an attacker can also gain some control over which
data will be held in the uninitialized stack variables. This can allow him
to bypass KASLR, and stack canaries protection - as both pointers and stack
canaries may be leaked in this manner (CVE-2017-1000410).

The dccp_disconnect function in net/dccp/proto.c in the Linux kernel through
4.14.3 allows local users to gain privileges or cause a denial of service
(use-after-free) via an AF_UNSPEC connect system call during the DCCP_LISTEN
state (CVE-2017-8824).

For other fixes, see the referenced changelogs.

References

SRPMS

5/core