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amazonAmazonALAS2-2020-1465
HistoryJul 21, 2020 - 4:34 p.m.

Important: kernel

2020-07-2116:34:00
alas.aws.amazon.com
77

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

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

Issue Overview:

An issue where a provided address with access_ok() is not checked was discovered in i915_gem_execbuffer2_ioctl in drivers/gpu/drm/i915/i915_gem_execbuffer.c in the Linux kernel through 4.19.13. A local attacker can craft a malicious IOCTL function call to overwrite arbitrary kernel memory, resulting in a Denial of Service or privilege escalation. (CVE-2018-20669)

A flaw was found in the prctl() function, where it can be used to enable indirect branch speculation after it has been disabled. This call incorrectly reports it as being ‘force disabled’ when it is not and opens the system to Spectre v2 attacks. The highest threat from this vulnerability is to confidentiality. (CVE-2020-10768)

relay_open in kernel/relay.c in the Linux kernel through 5.4.1 allows local users to cause a denial of service (such as relay blockage) by triggering a NULL alloc_percpu result. (CVE-2019-19462)

A logic bug flaw was found in the Linux kernel’s implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality. (CVE-2020-10766)

A flaw was found in the Linux kernel’s implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier). The IBPB mitigation will be disabled when STIBP is not available or when the Enhanced Indirect Branch Restricted Speculation (IBRS) is available. This flaw allows a local attacker to perform a Spectre V2 style attack when this configuration is active. The highest threat from this vulnerability is to confidentiality. ( CVE-2020-10767)

An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails. (CVE-2020-12771)

A flaw was found in the Linux kernel’s implementation of Userspace core dumps. This flaw allows an attacker with a local account to crash a trivial program and exfiltrate private kernel data. (CVE-2020-10732)

A flaw was found in the Linux Kernel in versions after 4.5-rc1 in the way mremap handled DAX Huge Pages. This flaw allows a local attacker with access to a DAX enabled storage to escalate their privileges on the system. (CVE-2020-10757)

Affected Packages:

kernel

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

New Packages:

aarch64:  
    kernel-4.14.186-146.268.amzn2.aarch64  
    kernel-headers-4.14.186-146.268.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.186-146.268.amzn2.aarch64  
    perf-4.14.186-146.268.amzn2.aarch64  
    perf-debuginfo-4.14.186-146.268.amzn2.aarch64  
    python-perf-4.14.186-146.268.amzn2.aarch64  
    python-perf-debuginfo-4.14.186-146.268.amzn2.aarch64  
    kernel-tools-4.14.186-146.268.amzn2.aarch64  
    kernel-tools-devel-4.14.186-146.268.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.186-146.268.amzn2.aarch64  
    kernel-devel-4.14.186-146.268.amzn2.aarch64  
    kernel-debuginfo-4.14.186-146.268.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.186-146.268.amzn2.i686  
  
src:  
    kernel-4.14.186-146.268.amzn2.src  
  
x86_64:  
    kernel-4.14.186-146.268.amzn2.x86_64  
    kernel-headers-4.14.186-146.268.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.186-146.268.amzn2.x86_64  
    perf-4.14.186-146.268.amzn2.x86_64  
    perf-debuginfo-4.14.186-146.268.amzn2.x86_64  
    python-perf-4.14.186-146.268.amzn2.x86_64  
    python-perf-debuginfo-4.14.186-146.268.amzn2.x86_64  
    kernel-tools-4.14.186-146.268.amzn2.x86_64  
    kernel-tools-devel-4.14.186-146.268.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.186-146.268.amzn2.x86_64  
    kernel-devel-4.14.186-146.268.amzn2.x86_64  
    kernel-debuginfo-4.14.186-146.268.amzn2.x86_64  
    kernel-livepatch-4.14.186-146.268-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2018-20669, CVE-2019-19462, CVE-2020-10732, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-12771

Mitre: CVE-2018-20669, CVE-2019-19462, CVE-2020-10732, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-12771

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

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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