Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.0854
linux-4.9 security update
18 March 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux-4.9
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Privileged Data -- Existing Account
Increased Privileges -- Existing Account
Reduced Security -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2018-19407 CVE-2018-18710 CVE-2018-18690
CVE-2018-18281 CVE-2018-17972 CVE-2018-16862
CVE-2018-15471 CVE-2018-14616 CVE-2018-14614
CVE-2018-14613 CVE-2018-14612 CVE-2018-14611
CVE-2018-14610 CVE-2018-13406 CVE-2018-13100
CVE-2018-13097 CVE-2018-13096 CVE-2018-13053
CVE-2018-12896 CVE-2018-6554 CVE-2018-5848
CVE-2018-5391 CVE-2018-3639 CVE-2018-1129
CVE-2018-1128 CVE-2017-18249
Reference: ESB-2019.0675
ESB-2018.2097
ESB-2018.1608
ESB-2018.1553
ESB-2018.1549
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
- --------------------------BEGIN INCLUDED TEXT--------------------
Package : linux-4.9
Version : 4.9.144-3.1~deb8u1
CVE ID : CVE-2017-18249 CVE-2018-1128 CVE-2018-1129 CVE-2018-3639
CVE-2018-5391 CVE-2018-5848 CVE-2018-6554 CVE-2018-12896
CVE-2018-13053 CVE-2018-13096 CVE-2018-13097 CVE-2018-13100
CVE-2018-13406 CVE-2018-14610 CVE-2018-14611 CVE-2018-14612
CVE-2018-14613 CVE-2018-14614 CVE-2018-14616 CVE-2018-15471
CVE-2018-16862 CVE-2018-17972 CVE-2018-18281 CVE-2018-18690
CVE-2018-18710 CVE-2018-19407
Debian Bug : 890034 896911 907581 915229 915231
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2017-18249
A race condition was discovered in the disk space allocator of
F2FS. A user with access to an F2FS volume could use this to cause
a denial of service or other security impact.
CVE-2018-1128, CVE-2018-1129
The cephx authentication protocol used by Ceph was susceptible to
replay attacks, and calculated signatures incorrectly. These
vulnerabilities in the server required changes to authentication
that are incompatible with existing clients. The kernel's client
code has now been updated to be compatible with the fixed server.
CVE-2018-3639 (SSB)
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 adds a further mitigation for this issue in the eBPF
(Extended Berkeley Packet Filter) implementation.
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 was previously mitigated by reducing the default limits on
memory usage for incomplete fragmented packets. This update
replaces that mitigation with a more complete fix.
CVE-2018-5848
The wil6210 wifi driver did not properly validate lengths in scan
and connection requests, leading to a possible buffer overflow.
On systems using this driver, a local user with the CAP_NET_ADMIN
capability could use this for denial of service (memory corruption
or crash) or potentially for privilege escalation.
CVE-2018-12896, CVE-2018-13053
Team OWL337 reported possible integer overflows in the POSIX
timer implementation. These might have some security impact.
CVE-2018-13096, CVE-2018-13097, CVE-2018-13100, CVE-2018-14614,
CVE-2018-14616
Wen Xu from SSLab at Gatech reported that crafted F2FS volumes
could trigger a crash (BUG, Oops, or division by zero) and/or
out-of-bounds memory access. An attacker able to mount such a
volume could use this to cause a denial of service or possibly for
privilege escalation.
CVE-2018-13406
Dr Silvio Cesare of InfoSect reported a potential integer overflow
in the uvesafb driver. A user with permission to access such a
device might be able to use this for denial of service or
privilege escalation.
CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613
Wen Xu from SSLab at Gatech reported that crafted Btrfs volumes
could trigger a crash (Oops) and/or out-of-bounds memory access.
An attacker able to mount such a volume could use this to cause a
denial of service or possibly for privilege escalation.
CVE-2018-15471 ((XSA-270)
Felix Wilhelm of Google Project Zero discovered a flaw in the hash
handling of the xen-netback Linux kernel module. A malicious or
buggy frontend may cause the (usually privileged) backend to make
out of bounds memory accesses, potentially resulting in privilege
escalation, denial of service, or information leaks.
https://xenbits.xen.org/xsa/advisory-270.html
CVE-2018-16862
Vasily Averin and Pavel Tikhomirov from Virtuozzo Kernel Team
discovered that the cleancache memory management feature did not
invalidate cached data for deleted files. On Xen guests using the
tmem driver, local users could potentially read data from other
users' deleted files if they were able to create new files on the
same volume.
CVE-2018-17972
Jann Horn reported that the /proc/*/stack files in procfs leaked
sensitive data from the kernel. These files are now only readable
by users with the CAP_SYS_ADMIN capability (usually only root)
CVE-2018-18281
Jann Horn reported a race condition in the virtual memory manager
that can result in a process briefly having access to memory after
it is freed and reallocated. A local user could possibly exploit
this for denial of service (memory corruption) or for privilege
escalation.
CVE-2018-18690
Kanda Motohiro reported that XFS did not correctly handle some
xattr (extended attribute) writes that require changing the disk
format of the xattr. A user with access to an XFS volume could use
this for denial of service.
CVE-2018-18710
It was discovered that the cdrom driver does not correctly
validate the parameter to the CDROM_SELECT_DISC 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-2018-19407
Wei Wu reported a potential crash (Oops) in the KVM implementation
for x86 processors. A user with access to /dev/kvm could use this
for denial of service.
For Debian 8 "Jessie", these problems have been fixed in version
4.9.144-3.1~deb8u1. This version also includes fixes for Debian bugs
#890034, #896911, #907581, #915229, and #915231; and other fixes
included in upstream stable updates.
We recommend that you upgrade your linux-4.9 packages.
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
- -----BEGIN PGP SIGNATURE-----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=bEg1
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=58y7
-----END PGP SIGNATURE-----