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AUSCERT External Security Bulletin Redistribution
linux-4.9 security update
18 March 2019
AusCERT Security Bulletin Summary
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
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
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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
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
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.
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.
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.
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.
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.
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,
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
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
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.
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.
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
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)
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
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.
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
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
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