Debian LTS: DLA-1919-2: linux-4.9 security update
Summary
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
This updated advisory text mentions the additional non-security
changes and notes the need to install new binary packages.
CVE-2019-0136
It was discovered that the wifi soft-MAC implementation (mac80211)
did not properly authenticate Tunneled Direct Link Setup (TDLS)
messages. A nearby attacker could use this for denial of service
(loss of wifi connectivity).
CVE-2019-9506
Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen
discovered a weakness in the Bluetooth pairing protocols, dubbed
the "KNOB attack". An attacker that is nearby during pairing
could use this to weaken the encryption used between the paired
devices, and then to eavesdrop on and/or spoof communication
between them.
This update mitigates the attack by requiring a minimum encryption
key length of 56 bits.
CVE-2019-11487
Jann Horn discovered that the FUSE (Filesystem-in-Userspace)
facility could be used to cause integer overflow in page reference
counts, leading to a use-after-free. On a system with sufficient
physical memory, a local user permitted to create arbitrary FUSE
mounts could use this for privilege escalation.
By default, unprivileged users can only mount FUSE filesystems
through fusermount, which limits the number of mounts created and
should completely mitigate the issue.
CVE-2019-15211
The syzkaller tool found a bug in the radio-raremono driver that
could lead to a use-after-free. An attacker able to add and
remove USB devices could use this to cause a denial of service
(memory corruption or crash) or possibly for privilege escalation.
CVE-2019-15212
The syzkaller tool found that the rio500 driver does not work
correctly if more than one device is bound to it. An attacker
able to add USB devices could use this to cause a denial of
service (memory corruption or crash) or possibly for privilege
escalation.
CVE-2019-15215
The syzkaller tool found a bug in the cpia2_usb driver that leads
to a use-after-free. An attacker able to add and remove USB
devices could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.
CVE-2019-15216
The syzkaller tool found a bug in the yurex driver that leads to
a use-after-free. An attacker able to add and remove USB
devices could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.
CVE-2019-15218
The syzkaller tool found that the smsusb driver did not validate
that USB devices have the expected endpoints, potentially leading
to a null pointer dereference. An attacker able to add USB
devices could use this to cause a denial of service (BUG/oops).
CVE-2019-15219
The syzkaller tool found that a device initialisation error in the
sisusbvga driver could lead to a null pointer dereference. An
attacker able to add USB devices could use this to cause a denial
of service (BUG/oops).
CVE-2019-15220
The syzkaller tool found a race condition in the p54usb driver
which could lead to a use-after-free. An attacker able to add and
remove USB devices could use this to cause a denial of service
(memory corruption or crash) or possibly for privilege escalation.
CVE-2019-15221
The syzkaller tool found that the line6 driver did not validate
USB devices' maximum packet sizes, which could lead to a heap
buffer overrun. An attacker able to add USB devices could use
this to cause a denial of service (memory corruption or crash) or
possibly for privilege escalation.
CVE-2019-15292
The Hulk Robot tool found missing error checks in the Appletalk
protocol implementation, which could lead to a use-after-free.
The security impact of this is unclear.
CVE-2019-15538
Benjamin Moody reported that operations on XFS hung after a
chgrp command failed due to a disk quota. A local user on a
system using XFS and disk quotas could use this for denial of
service.
CVE-2019-15666
The Hulk Robot tool found an incorrect range check in the network
transformation (xfrm) layer, leading to out-of-bounds memory
accesses. A local user with CAP_NET_ADMIN capability (in any user
namespace) could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.
CVE-2019-15807
Jian Luo reported that the Serial Attached SCSI library (libsas)
did not correctly handle failure to discover devices beyond a SAS
expander. This could lead to a resource leak and crash (BUG).
The security impact of this is unclear.
CVE-2019-15924
The Hulk Robot tool found a missing error check in the fm10k
Ethernet driver, which could lead to a null pointer dereference
and crash (BUG/oops). The security impact of this is unclear.
CVE-2019-15926
It was found that the ath6kl wifi driver did not consistently
validate traffic class numbers in received control packets,
leading to out-of-bounds memory accesses. A nearby attacker on
the same wifi network could use this to cause a denial of service
(memory corruption or crash) or possibly for privilege escalation.
For Debian 8 "Jessie", these problems have been fixed in version
4.9.189-3~deb8u1. This version also includes a fix for Debian bug
#930904, and other fixes included in upstream stable updates.
We recommend that you upgrade your linux-4.9 and linux-latest-4.9
packages. You will need to use "apt-get upgrade --with-new-pkgs"
or "apt upgrade" as the binary package names have changed.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
--
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
Package :linux-4.9
