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amazonAmazonALAS-2016-772
HistoryDec 06, 2016 - 11:44 p.m.

Important: kernel

2016-12-0623:44:00
alas.aws.amazon.com
60

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.0004 Low

EPSS

Percentile

9.5%

Issue Overview:

CVE-2016-8645 kernel: a BUG() statement can be hit in net/ipv4/tcp_input.c
It was discovered that the Linux kernel since 3.6-rc1 with net.ipv4.tcp_fastopen; set to 1 can hit BUG() statement in tcp_collapse() function after making a number of certain syscalls leading to a possible system crash.

CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free
A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system.

CVE-2016-9083 kernel: State machine confusion bug in vfio driver leading to memory corruption
A flaw was discovered in the Linux kernel’s implementation of VFIO. An attacker issuing an ioctl can create a situation where memory is corrupted and modify memory outside of the expected area. This may overwrite kernel memory and subvert kernel execution.

CVE-2016-9084 kernel: Integer overflow when using kzalloc in vfio driver
The use of a kzalloc with an integer multiplication allowed an integer overflow condition to be reached in vfio_pci_intrs.c. This combined with CVE-2016-9083 may allow an attacker to craft an attack and use unallocated memory, potentially crashing the machine.

Affected Packages:

kernel

Issue Correction:
Run yum update kernel to update your system.

New Packages:

i686:  
    kernel-debuginfo-common-i686-4.4.35-33.55.amzn1.i686  
    perf-debuginfo-4.4.35-33.55.amzn1.i686  
    kernel-tools-4.4.35-33.55.amzn1.i686  
    perf-4.4.35-33.55.amzn1.i686  
    kernel-4.4.35-33.55.amzn1.i686  
    kernel-tools-debuginfo-4.4.35-33.55.amzn1.i686  
    kernel-headers-4.4.35-33.55.amzn1.i686  
    kernel-debuginfo-4.4.35-33.55.amzn1.i686  
    kernel-tools-devel-4.4.35-33.55.amzn1.i686  
    kernel-devel-4.4.35-33.55.amzn1.i686  
  
noarch:  
    kernel-doc-4.4.35-33.55.amzn1.noarch  
  
src:  
    kernel-4.4.35-33.55.amzn1.src  
  
x86_64:  
    kernel-tools-4.4.35-33.55.amzn1.x86_64  
    perf-debuginfo-4.4.35-33.55.amzn1.x86_64  
    kernel-headers-4.4.35-33.55.amzn1.x86_64  
    kernel-tools-devel-4.4.35-33.55.amzn1.x86_64  
    perf-4.4.35-33.55.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-4.4.35-33.55.amzn1.x86_64  
    kernel-4.4.35-33.55.amzn1.x86_64  
    kernel-devel-4.4.35-33.55.amzn1.x86_64  
    kernel-debuginfo-4.4.35-33.55.amzn1.x86_64  
    kernel-tools-debuginfo-4.4.35-33.55.amzn1.x86_64  

Additional References

Red Hat: CVE-2016-8645, CVE-2016-8655, CVE-2016-9083, CVE-2016-9084

Mitre: CVE-2016-8645, CVE-2016-8655, CVE-2016-9083, CVE-2016-9084

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.0004 Low

EPSS

Percentile

9.5%