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amazonAmazonALAS2-2020-1425
HistoryMay 11, 2020 - 8:37 p.m.

Important: kernel

2020-05-1120:37:00
alas.aws.amazon.com
54

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.1 High

AI Score

Confidence

High

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

0.008 Low

EPSS

Percentile

81.3%

Issue Overview:

A NULL pointer dereference flaw was found in the Linux kernel’s SELinux subsystem. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol’s category bitmap into the SELinux extensible bitmap via the’ ebitmap_netlbl_import’ routine. While processing the CIPSO restricted bitmap tag in the ‘cipso_v4_parsetag_rbm’ routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service. (CVE-2020-10711)

Affected Packages:

kernel

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

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

New Packages:

aarch64:  
    kernel-4.14.177-139.254.amzn2.aarch64  
    kernel-headers-4.14.177-139.254.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.177-139.254.amzn2.aarch64  
    perf-4.14.177-139.254.amzn2.aarch64  
    perf-debuginfo-4.14.177-139.254.amzn2.aarch64  
    python-perf-4.14.177-139.254.amzn2.aarch64  
    python-perf-debuginfo-4.14.177-139.254.amzn2.aarch64  
    kernel-tools-4.14.177-139.254.amzn2.aarch64  
    kernel-tools-devel-4.14.177-139.254.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.177-139.254.amzn2.aarch64  
    kernel-devel-4.14.177-139.254.amzn2.aarch64  
    kernel-debuginfo-4.14.177-139.254.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.177-139.254.amzn2.i686  
  
src:  
    kernel-4.14.177-139.254.amzn2.src  
  
x86_64:  
    kernel-4.14.177-139.254.amzn2.x86_64  
    kernel-headers-4.14.177-139.254.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.177-139.254.amzn2.x86_64  
    perf-4.14.177-139.254.amzn2.x86_64  
    perf-debuginfo-4.14.177-139.254.amzn2.x86_64  
    python-perf-4.14.177-139.254.amzn2.x86_64  
    python-perf-debuginfo-4.14.177-139.254.amzn2.x86_64  
    kernel-tools-4.14.177-139.254.amzn2.x86_64  
    kernel-tools-devel-4.14.177-139.254.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.177-139.254.amzn2.x86_64  
    kernel-devel-4.14.177-139.254.amzn2.x86_64  
    kernel-debuginfo-4.14.177-139.254.amzn2.x86_64  
    kernel-livepatch-4.14.177-139.254-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2020-10711

Mitre: CVE-2020-10711

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.1 High

AI Score

Confidence

High

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

0.008 Low

EPSS

Percentile

81.3%