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AUSCERT External Security Bulletin Redistribution
ESB-2019.1800
Vulnerabilities in the Linux Kernel affect PowerKVM
20 May 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: PowerKVM
Publisher: IBM
Operating System: KVM
Impact/Access: Denial of Service -- Remote/Unauthenticated
Root Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6974 CVE-2018-1000026 CVE-2018-18559
CVE-2018-17972 CVE-2018-14634 CVE-2018-14633
CVE-2018-13405 CVE-2018-10940 CVE-2018-10883
CVE-2018-10881 CVE-2018-10879 CVE-2018-10878
CVE-2018-9568 CVE-2018-8781 CVE-2018-7757
CVE-2018-7740 CVE-2018-5803 CVE-2018-5344
CVE-2018-1130 CVE-2018-1094 CVE-2018-1092
CVE-2017-18344 CVE-2017-18232 CVE-2017-18208
CVE-2017-17805 CVE-2017-10661 CVE-2017-0861
CVE-2016-4913 CVE-2015-8830
Reference: ASB-2019.0109
ASB-2019.0084
ESB-2019.1793
ESB-2019.1723
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=ibm10881424
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Vulnerabilities in the Linux Kernel affect PowerKVM
Product: PowerKVM
Software version: 3.1
Operating system(s): Linux
Reference #: 0881424
Security Bulletin
Summary
PowerKVM is affected by vulnerabilities in the Linux Kernel. IBM has now
addressed these vulnerabilities.
Vulnerability Details
CVEID: CVE-2018-1000026
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by the
improper validation of user-supplied input by the bnx2x network card driver. By
sending specially crafted GSO packets, a remote attacker could exploit this
vulnerability to cause an assertion and take the card off-line.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
138955 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2018-18559
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
use-after-free when there is an incomplete fix for a race condition between
fanout_add from setsockopt and bind on an AF_PACKET socket. By sending a
specially crafted packet, a remote attacker could exploit this vulnerability to
achieve Program Counter control and cause the kernel to crash.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
151816 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-14634
DESCRIPTION: Linux Kernel could allow a local authenticated attacker to gain
elevated privileges on the system, caused by an integer overflow in the
create_elf_tables function. By using a specially-crafted binary file, an
attacker could exploit this vulnerability to obtain full root privileges.
CVSS Base Score: 7.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
150310 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2018-14633
DESCRIPTION: Linux Kernel is vulnerable to a stack-based buffer overflow,
caused by improper bounds checking by the chap_server_compute_md5() function.
If the iSCSI target to be enabled on the victim host, an attacker could
overflow a buffer and execute arbitrary code on the system or cause the system
to crash.
CVSS Base Score: 7
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
150238 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H)
CVEID: CVE-2018-13405
DESCRIPTION: Linux Kernel could allow a local attacker to gain elevated
privileges on the system, caused by a flaw in the fs/inode.c:inode_init_owner()
function. An attacker could exploit this vulnerability to create files with an
unintended group ownership.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
146434 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2018-10940
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive
information, caused by a flaw in the cdrom_ioctl_media_changed function in
drivers/cdrom/cdrom.c. By using a specially-crafted ioctl, an attacker could
exploit this vulnerability to read out kernel memory.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
143080 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2018-10883
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an
out-of-bounds write in the jbd2_journal_dirty_metadata() function. By mounting
and operating on a specially crafted ext4 filesystem image, a local attacker
could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147830 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-10881
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an
out-of-bound access in the ext4_get_group_info function. By mounting and
operating on a specially crafted ext4 filesystem image, a local attacker could
exploit this vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147820 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-10879
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
use-after-free in the ext4_xattr_set_entry function. By renaming a file a
specially crafted ext4 filesystem image, a local attacker could exploit this
vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147832 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-10878
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an
out-of-bounds write in the ext4 filesystem. By mounting and operating on a
specially crafted ext4 filesystem image, a local attacker could exploit this
vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147833 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-8781
DESCRIPTION: Linux Kernel could allow a local attacker to execute arbitrary
code on the system, caused by an integer overflow in the udl_fb_mmap function
in drivers/gpu/drm/udl/udl_fb.c. An attacker could exploit this vulnerability
to execute arbitrary code on the system.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
142300 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2018-7757
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
memory leak in the sas_smp_get_phy_events function in drivers/scsi/libsas/
sas_expander.c. By performing many read accesses to files in the /sys/class/
sas_phy directory, a local attacker could exploit this vulnerability to cause
the system to crash.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
140138 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2018-7740
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
flaw in the resv_map_release function in mm/hugetlb.c. By using a
specially-crafted application, a local attacker could exploit this
vulnerability to cause the system to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
139974 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-5803
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a in
the _sctp_make_chunk() function in net/sctp/sm_make_chunk.c. By sending
specially-crafted SCTP packets, a local attacker could exploit this
vulnerability to cause the kernel to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
139740 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-5344
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
use-after-free in the drivers/block/loop.c. A local attacker could exploit this
vulnerability to cause the system to crash.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
137649 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2018-1130
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
NULL pointer dereference in dccp_write_xmit() function in net/dccp/output.c. By
using specially-crafted system calls, a local attacker could exploit this
vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
143153 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-1094
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
NULL pointer dereference flaw in the ext4_fill_super function in fs/ext4/
super.c. By persuading a victim to open a specially-crafted file, a remote
attacker could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 5.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
141198 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-1092
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
NULL pointer dereference flaw in the ext4_iget function in fs/ext4/inode.c. By
persuading a victim to open a specially-crafted file, a remote attacker could
exploit this vulnerability to cause the system to crash.
CVSS Base Score: 5.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
141196 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
CVEID: CVE-2017-18344
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive
information, caused by an out-of-bounds memory read error in the sigevent->
sigev_notify'' field of show_timer() function. An attacker could exploit this
vulnerability to obtain kernel memory.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
147880 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2017-18232
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
deadlock in the Serial Attached SCSI (SAS) implementation. By triggering
certain error-handling code, a local attacker could exploit this vulnerability
to cause the system to crash.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
140428 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2017-18208
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
flaw in the madvise_willneed function in mm/madvise.c. By triggering use of
MADVISE_WILLNEED for a DAX mapping, a local attacker could exploit this
vulnerability to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
139764 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2017-17805
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by
improper handling of zero-length inputs in the Salsa20 encryption algorithm. By
using the AF_ALG-based skcipher interface (CONFIG_CRYPTO_USER_API_SKCIPHER), a
local authenticated attacker could exploit this vulnerability to cause the
system crash.
CVSS Base Score: 5.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
136626 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2017-10661
DESCRIPTION: Linux Kernel could allow a local attacker to gain elevated
privileges on the system, caused by a race condition in fs/timerfd.c. An
attacker could exploit this vulnerability to gain privileges or cause a denial
of service.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
130802 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2017-0861
DESCRIPTION: Google Android could allow a remote attacker to gain elevated
privileges on the system, caused by a flaw in the Upstream kernel audio driver.
By persuading a victim to open a specially-crafted application, an attacker
could exploit this vulnerability to gain elevated privileges on the system.
CVSS Base Score: 7.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
135049 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVEID: CVE-2016-4913
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive
information, caused by the improper handling of NM entries containing NUL
characters by the get_rock_ridge_filename function in fs/isofs/rock.c. An
attacker could exploit this vulnerability using a specially crafted isofs
filesystem to read from kernel memory locations.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
113397 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2015-8830
DESCRIPTION: Linux Kernel could allow a remote attacker to execute arbitrary
code on the system, caused by an integer overflow in the AIO interface. By
applying to certain filesystems, socket or device types, an attacker could
exploit this vulnerability to execute arbitrary code on the system.
CVSS Base Score: 7.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
111186 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2019-6974
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by the
improper handling of reference counting by kvm_ioctl_create_device in virt/kvm/
kvm_main.c. A local authenticated attacker could exploit this vulnerability to
trigger a use-after-free to crash the guest VM and possibly gain privileged
access to a system.
CVSS Base Score: 7.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
157074 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2018-17972
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive
information, caused by a flaw in the proc_pid_stack function in fs/proc/base.c.
By sending a specially-crafted request, a local attacker could exploit this
vulnerability to obtain kernel task stack contents.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
150826 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2018-9568
DESCRIPTION: Google Android could allow a local attacker to gain elevated
privileges on the system, caused by a type confusion flaw in the sk_clone_lock
function in sock.c. By sending a specially-crafted request, an attacker could
exploit this vulnerability to gain elevated privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
153889 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
PowerKVM 3.1
Remediation/Fixes
Customers can update PowerKVM systems by using "yum update".
Fix images are made available via Fix Central. For version 3.1, see https://
ibm.biz/BdHggw. This issue is addressed starting with v3.1.0.2 update 18.
Workarounds and Mitigations
none
Change History
18 April 2019 - Initial Version
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