| Descripción: | Summary:
The remote host is missing an update for the 'kernel-linus' package(s) announced via the MGASA-2018-0265 advisory.
Vulnerability Insight:
This kernel-linus update is based on the upstream 4.14.44 and fixes at least
the following security issues:
The netfilter subsystem in the Linux kernel through 4.15.7 mishandles the
case of a rule blob that contains a jump but lacks a user-defined chain,
which allows local users to cause a denial of service (NULL pointer
dereference) by leveraging the CAP_NET_RAW or CAP_NET_ADMIN capability,
related to arpt_do_table in net/ipv4/netfilter/arp_tables.c, ipt_do_table
in net/ipv4/netfilter/ip_tables.c, and ip6t_do_table in
net/ipv6/netfilter/ip6_tables.c (CVE-2018-1065).
A flaw was found in the Linux kernel implementation of 32 bit syscall
interface for bridging allowing a privileged user to arbitrarily write
to a limited range of kernel memory. This flaw can be exploited not only
by a system's privileged user (a real 'root' user), but also by an
attacker who is a privileged user (a 'root' user) in a user+network
namespace (CVE-2018-1068).
On x86, MOV SS and POP SS behave strangely if they encounter a data
breakpoint. If this occurs in a KVM guest, KVM incorrectly thinks that
a #DB instruction was caused by the undocumented ICEBP instruction. This
results in #DB being delivered to the guest kernel with an incorrect RIP
on the stack. On most guest kernels, this will allow a guest user to DoS
the guest kernel or even to escalate privilege to that of the guest kernel
(CVE-2018-1087).
The ext4_iget function in fs/ext4/inode.c in the Linux kernel through
4.15.15 mishandles the case of a root directory with a zero i_links_count,
which allows attackers to cause a denial of service (ext4_process_freed_data
NULL pointer dereference and OOPS) via a crafted ext4 image (CVE-2018-1092).
The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel
through 4.15.15 allows attackers to cause a denial of service (out-of-bounds
read and system crash) via a crafted ext4 image because balloc.c and ialloc.c
do not validate bitmap block numbers (CVE-2018-1093).
The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through
4.15.15 does not always initialize the crc32c checksum driver, which allows
attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer
dereference and system crash) via a crafted ext4 image (CVE-2018-1094).
The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel
through 4.15.15 does not properly validate xattr sizes, which causes
misinterpretation of a size as an error code, and consequently allows
attackers to cause a denial of service (get_acl NULL pointer dereference and
system crash) via a crafted ext4 image (CVE-2018-1095).
Predictable Random Number Generator Weakness (CVE-2018-1108).
By mmap()ing a FUSE-backed file onto a process's memory containing command
line arguments (or environment strings), an attacker can cause utilities
from psutils or procps (such as ps, w) or any other program which makes ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'kernel-linus' package(s) on Mageia 6.
Solution:
Please install the updated package(s).
CVSS Score:
7.2
CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
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