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AUSCERT External Security Bulletin Redistribution
ESB-2018.3020
linux security update
5 October 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-17182 CVE-2018-16658 CVE-2018-16276
CVE-2018-15594 CVE-2018-15572 CVE-2018-14734
CVE-2018-14678 CVE-2018-14634 CVE-2018-14633
CVE-2018-14617 CVE-2018-14609 CVE-2018-13406
CVE-2018-13405 CVE-2018-13094 CVE-2018-13093
CVE-2018-10902 CVE-2018-10883 CVE-2018-10882
CVE-2018-10881 CVE-2018-10880 CVE-2018-10879
CVE-2018-10878 CVE-2018-10877 CVE-2018-10876
CVE-2018-10323 CVE-2018-10021 CVE-2018-9516
CVE-2018-9363 CVE-2018-7755 CVE-2018-6555
CVE-2018-6554 CVE-2018-5391 CVE-2018-3646
CVE-2018-3639 CVE-2018-3620 CVE-2018-1627
CVE-2018-1467 CVE-2018-1460 CVE-2018-1309
CVE-2018-1088 CVE-2018-1087
Reference: ASB-2018.0204
ESB-2018.2981
ESB-2018.2974
ESB-2018.2887
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2018/10/msg00005.html
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Package : linux
Version : 3.16.59-1
CVE ID : CVE-2018-3620 CVE-2018-3639 CVE-2018-5391 CVE-2018-6554
CVE-2018-6555 CVE-2018-7755 CVE-2018-9363 CVE-2018-9516
CVE-2018-10021 CVE-2018-10323 CVE-2018-10876 CVE-2018-10877
CVE-2018-10878 CVE-2018-10879 CVE-2018-10880 CVE-2018-10881
CVE-2018-10882 CVE-2018-10883 CVE-2018-10902 CVE-2018-13093
CVE-2018-13094 CVE-2018-13405 CVE-2018-13406 CVE-2018-14609
CVE-2018-14617 CVE-2018-14633 CVE-2018-14634 CVE-2018-14678
CVE-2018-14734 CVE-2018-15572 CVE-2018-15594 CVE-2018-16276
CVE-2018-16658 CVE-2018-17182
Debian Bug : 898137
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2018-3620
Multiple researchers have discovered a vulnerability in the way
the Intel processor designs have implemented speculative execution
of instructions in combination with handling of page-faults. This
flaw could allow an attacker controlling an unprivileged process
to read memory from arbitrary (non-user controlled) addresses,
including from the kernel and all other processes running on the
system or cross guest/host boundaries to read host memory.
This issue covers only attackers running normal processes. A
related issue (CVE-2018-3646) exists with KVM guests, and is not
yet fixed.
CVE-2018-3639
Multiple researchers have discovered that Speculative Store Bypass
(SSB), a feature implemented in many processors, could be used to
read sensitive information from another context. In particular,
code in a software sandbox may be able to read sensitive
information from outside the sandbox. This issue is also known as
Spectre variant 4.
This update allows the issue to be mitigated on some x86
processors by disabling SSB. This requires an update to the
processor's microcode, which is non-free. DLA 1446-1 and DLA
1506-1 provided this for some Intel processors. For other
processors, it may be included in an update to the system BIOS or
UEFI firmware, or in a future update to the intel-microcode or
amd64-microcode packages.
Disabling SSB can reduce performance significantly, so by default
it is only done in tasks that use the seccomp feature.
Applications that require this mitigation should request it
explicitly through the prctl() system call. Users can control
where the mitigation is enabled with the spec_store_bypass_disable
kernel parameter.
CVE-2018-5391 (FragmentSmack)
Juha-Matti Tilli discovered a flaw in the way the Linux kernel
handled reassembly of fragmented IPv4 and IPv6 packets. A remote
attacker can take advantage of this flaw to trigger time and
calculation expensive fragment reassembly algorithms by sending
specially crafted packets, leading to remote denial of service.
This is mitigated by reducing the default limits on memory usage
for incomplete fragmented packets. The same mitigation can be
achieved without the need to reboot, by setting the sysctls:
net.ipv4.ipfrag_low_thresh =3D 196608
net.ipv6.ip6frag_low_thresh =3D 196608
net.ipv4.ipfrag_high_thresh =3D 262144
net.ipv6.ip6frag_high_thresh =3D 262144
The default values may still be increased by local configuration
if necessary.
CVE-2018-6554
A memory leak in the irda_bind function in the irda subsystem was
discovered. A local user can take advantage of this flaw to cause a
denial of service (memory consumption).
CVE-2018-6555
A flaw was discovered in the irda_setsockopt function in the irda
subsystem, allowing a local user to cause a denial of service
(use-after-free and system crash).
CVE-2018-7755
Brian Belleville discovered a flaw in the fd_locked_ioctl function
in the floppy driver in the Linux kernel. The floppy driver copies a
kernel pointer to user memory in response to the FDGETPRM ioctl. A
local user with access to a floppy drive device can take advantage
of this flaw to discover the location kernel code and data.
CVE-2018-9363
It was discovered that the Bluetooth HIDP implementation did not
correctly check the length of received report messages. A paired
HIDP device could use this to cause a buffer overflow, leading to
denial of service (memory corruption or crash) or potentially
remote code execution.
CVE-2018-9516
It was discovered that the HID events interface in debugfs did not
correctly limit the length of copies to user buffers. A local
user with access to these files could use this to cause a
denial of service (memory corruption or crash) or possibly for
privilege escalation. However, by default debugfs is only
accessible by the root user.
CVE-2018-10021
A physically present attacker who unplugs a SAS cable can cause a
denial of service (memory leak and WARN).
CVE-2018-10323, CVE-2018-13093, CVE-2018-13094
Wen Xu from SSLab at Gatech reported several NULL pointer
dereference flaws that may be triggered when mounting and
operating a crafted XFS volume. An attacker able to mount
arbitrary XFS volumes could use this to cause a denial of service
(crash).
CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
CVE-2018-10880, CVE-2018-10881, CVE-2018-10882, CVE-2018-10883
Wen Xu from SSLab at Gatech reported that crafted ext4 volumes
could trigger a crash or memory corruption. An attacker able to
mount arbitrary ext4 volumes could use this for denial of service
or possibly for privilege escalation.
CVE-2018-10902
It was discovered that the rawmidi kernel driver does not protect
against concurrent access which leads to a double-realloc (double
free) flaw. A local attacker can take advantage of this issue for
privilege escalation.
CVE-2018-13405
Jann Horn discovered that the inode_init_owner function in
fs/inode.c in the Linux kernel allows local users to create files
with an unintended group ownership allowing attackers to escalate
privileges by making a plain file executable and SGID.
CVE-2018-13406
Dr Silvio Cesare of InfoSect reported a potential integer overflow
in the uvesafb driver. A local user with permission to access
such a device might be able to use this for denial of service or
privilege escalation.
CVE-2018-14609
Wen Xu from SSLab at Gatech reported a potential null pointer
dereference in the F2FS implementation. An attacker able to mount
arbitrary F2FS volumes could use this to cause a denial of service
(crash).
CVE-2018-14617
Wen Xu from SSLab at Gatech reported a potential null pointer
dereference in the HFS+ implementation. An attacker able to mount
arbitrary HFS+ volumes could use this to cause a denial of service
(crash).
CVE-2018-14633
Vincent Pelletier discovered a stack-based buffer overflow flaw in
the chap_server_compute_md5() function in the iSCSI target code. An
unauthenticated remote attacker can take advantage of this flaw to
cause a denial of service or possibly to get a non-authorized access
to data exported by an iSCSI target.
CVE-2018-14634
Qualys reported an integer overflow in the initialisation of the
stack for ELF executables, which can cause the stack to overlap
the argument or environment strings. A local user may use this to
defeat environment variable filtering in setuid programs, leading
to privilege escalation.
CVE-2018-14678
M. Vefa Bicakci and Andy Lutomirski discovered a flaw in the
kernel exit code used on amd64 systems running as Xen PV guests.
A local user could use this to cause a denial of service (crash).
CVE-2018-14734
A use-after-free bug was discovered in the InfiniBand
communication manager. A local user could use this to cause a
denial of service (crash or memory corruption) or possible for
privilege escalation.
CVE-2018-15572
Esmaiel Mohammadian Koruyeh, Khaled Khasawneh, Chengyu Song, and
Nael Abu-Ghazaleh, from University of California, Riverside,
reported a variant of Spectre variant 2, dubbed SpectreRSB. A
local user may be able to use this to read sensitive information
from processes owned by other users.
CVE-2018-15594
Nadav Amit reported that some indirect function calls used in
paravirtualised guests were vulnerable to Spectre variant 2. A
local user may be able to use this to read sensitive information
from the kernel.
CVE-2018-16276
Jann Horn discovered that the yurex driver did not correctly limit
the length of copies to user buffers. A local user with access to
a yurex device node could use this to cause a denial of service
(memory corruption or crash) or possibly for privilege escalation.
CVE-2018-16658
It was discovered that the cdrom driver does not correctly
validate the parameter to the CDROM_DRIVE_STATUS ioctl. A user
with access to a cdrom device could use this to read sensitive
information from the kernel or to cause a denial of service
(crash).
CVE-2018-17182
Jann Horn discovered that the vmacache_flush_all function mishandles
sequence number overflows. A local user can take advantage of this
flaw to trigger a use-after-free, causing a denial of service
(crash or memory corruption) or privilege escalation.
For Debian 8 "Jessie", these problems have been fixed in version
3.16.59-1. This version also includes a fix for bug #898137 and
several other fixes included in upstream stable updates.
We recommend that you upgrade your linux packages. Since the kernel
ABI and binary package names have changed, you will need to use an
upgrade command that installs new dependencies, such as "apt upgrade"
or "apt-get upgrade --with-new-pkgs".
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
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