|
The SUSE Linux Enterprise 12 SP4 kernel was updated to receive various
security and bugfixes.
The following security bugs were fixed:
- CVE-2019-10638: A device could have been tracked by an attacker using
the IP ID values the kernel produces for connection-less protocols
(e.g., UDP and ICMP). When such traffic was sent to multiple destination
IP addresses, it was possible to obtain hash collisions (of indices to
the counter array) and thereby obtain the hashing key (via enumeration).
An attack may have been conducted by hosting a crafted web page that
uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP
addresses. (bnc#1140575)
- CVE-2019-10639: Information Exposure (partial kernel address
disclosure), leading to a KASLR bypass. Specifically, it was possible to
extract the KASLR kernel image offset using the IP ID values the kernel
produces for connection-less protocols (e.g., UDP and ICMP). When such
traffic was sent to multiple destination IP addresses, it was possible
to obtain hash collisions (of indices to the counter array) and thereby
obtain the hashing key (via enumeration). This key contains enough bits
from a kernel address (of a static variable) so when the key is
extracted (via enumeration), the offset of the kernel image was exposed.
This attack could have been carried out remotely, by the attacker
forcing the target device to send UDP or ICMP (or certain other) traffic
to attacker-controlled IP addresses. Forcing a server to send UDP
traffic is trivial if the server is a DNS server. ICMP traffic was
trivial if the server answered ICMP Echo requests (ping). For client
targets, if the target visited the attacker's web page, then WebRTC or
gQUIC could be used to force UDP traffic to attacker-controlled IP
addresses. (bnc#1140577)
- CVE-2018-20836: A race condition in smp_task_timedout() and
smp_task_done() in drivers/scsi/libsas/sas_expander.c, could have lead
to a use-after-free. (bnc#1134395)
- CVE-2019-11599: The coredump implementation in the Linux kernel did not
use locking or other mechanisms to prevent vma layout or vma flags
changes while it runs, which allowed local users to obtain sensitive
information, cause a denial of service, or possibly have unspecified
other impact by triggering a race condition with mmget_not_zero or
get_task_mm calls. This is related to fs/userfaultfd.c, mm/mmap.c,
fs/proc/task_mmu.c, and drivers/infiniband/core/uverbs_main.c.
(bnc#1133738)
- CVE-2019-12614: An unchecked kstrdup might have allowed an attacker to
cause denial of service (a NULL pointer dereference and system crash).
(bnc#1137194)
- CVE-2019-12819: The function __mdiobus_register() in
drivers/net/phy/mdio_bus.c called put_device() which would trigger a
fixed_mdio_bus_init use-after-free. This would cause a denial of
service. (bnc#1138291)
- CVE-2019-12818: The nfc_llcp_build_tlv function in
net/nfc/llcp_commands.c may have returned NULL. If the caller did not
check for this, it would trigger a NULL pointer dereference. This would
cause denial of service. (bnc#1138293)
The following non-security bugs were fixed:
http://lists.suse.com/pipermail/sle-security-updates/2019-July/005719.html
|