CVE-2020-0305: Use After Free

Published Jul 17, 2020
·
Updated

A use-after-free flaw was found in the way the Linux kernel's filesystem subsystem handled a race condition in the chrdevopen function. This flaw allows a privileged local user to starve the resources, causing a denial of service or potentially escalating their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Other sources

In cdevget of chardev.c, there is a possible use-after-free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed.

Reference:

https://android.googlesource.com/kernel/common/+/68faa679b8be1a74e6663c21c3a9d25d3

— Red Hat

In cdevget of chardev.c, there is a possible use-after-free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10Android ID: A-153467744

Affected Software

59 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-240.rt7.54.el8
0:4.18.0-240.rt7.54.el8
redhat/kernel<0:4.18.0-240.el8
0:4.18.0-240.el8
Google Android=10.0
openSUSE Leap=15.1
openSUSE Leap=15.2
ubuntu/linux-aws<4.4.0-1062.66
4.4.0-1062.66
ubuntu/linux-azure<4.15.0-1074.79~14.04.1
4.15.0-1074.79~14.04.1
ubuntu/linux-lts-xenial<4.4.0-174.204~14.04.1
4.4.0-174.204~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-174.204
4.4.0-174.204
ubuntu/linux-aws<4.4.0-1102.113
4.4.0-1102.113
ubuntu/linux-aws-hwe<4.15.0-1063.67~16.04.1
4.15.0-1063.67~16.04.1
ubuntu/linux-azure<4.15.0-1075.80
4.15.0-1075.80
ubuntu/linux-gcp<4.15.0-1058.62
4.15.0-1058.62
ubuntu/linux-hwe<4.15.0-91.92~16.04.1
4.15.0-91.92~16.04.1
ubuntu/linux-kvm<4.4.0-1066.73
4.4.0-1066.73
ubuntu/linux-oracle<4.15.0-1035.38~16.04.1
4.15.0-1035.38~16.04.1
ubuntu/linux-raspi2<4.4.0-1129.138
4.4.0-1129.138
ubuntu/linux-snapdragon<4.4.0-1133.141
4.4.0-1133.141
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1029.34
4.4.0-1029.34
ubuntu/linux-fips*
ubuntu/linux<4.15.0-91.92
4.15.0-91.92
ubuntu/linux-aws<4.15.0-1063.67
4.15.0-1063.67
ubuntu/linux-gke-4.15<4.15.0-1055.58
4.15.0-1055.58
ubuntu/linux-gke-5.0<5.0.0-1032.33
5.0.0-1032.33
ubuntu/linux-gke-5.3<5.3.0-1014.15~18.04.1
5.3.0-1014.15~18.04.1
ubuntu/linux-kvm<4.15.0-1056.57
4.15.0-1056.57
ubuntu/linux-oem<4.15.0-1076.86
4.15.0-1076.86
ubuntu/linux-oem-osp1<5.0.0-1043.48
5.0.0-1043.48
ubuntu/linux-oracle<4.15.0-1035.39
4.15.0-1035.39
ubuntu/linux-raspi2<4.15.0-1057.61
4.15.0-1057.61
ubuntu/linux-raspi2-5.3<5.3.0-1019.21~18.04.1
5.3.0-1019.21~18.04.1
ubuntu/linux-snapdragon<4.15.0-1074.81
4.15.0-1074.81
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2018.18
4.15.0-2018.18
ubuntu/linux-azure-fips<4.15.0-2006.7
4.15.0-2006.7
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15<5.15.0-1114.123~20.04.1
5.15.0-1114.123~20.04.1
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-raspi-realtime*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.rt7.54.el8
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.el8
  3. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1062.66
  4. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1074.79~14.04.1
  5. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-174.204~14.04.1
  6. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-174.204
  7. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1102.113
  8. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1063.67~16.04.1
  9. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1075.80
  10. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1058.62
  11. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-91.92~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1066.73
  13. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1035.38~16.04.1
  14. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1129.138
  15. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1133.141
  16. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1029.34
  17. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-91.92
  18. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1063.67
  19. Upgrade

    Upgrade ubuntu/linux-gke-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1055.58
  20. Upgrade

    Upgrade ubuntu/linux-gke-5.0 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1032.33
  21. Upgrade

    Upgrade ubuntu/linux-gke-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1014.15~18.04.1
  22. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1056.57
  23. Upgrade

    Upgrade ubuntu/linux-oem to a version that resolves this vulnerability.

    Fixed in 4.15.0-1076.86
  24. Upgrade

    Upgrade ubuntu/linux-oem-osp1 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1043.48
  25. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1035.39
  26. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1057.61
  27. Upgrade

    Upgrade ubuntu/linux-raspi2-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1019.21~18.04.1
  28. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1074.81
  29. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2018.18
  30. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2006.7
  31. Upgrade

    Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1114.123~20.04.1

Event History

Jul 17, 2020
CVE Published
12:00 AM
CVE Published
via MITRE·07:59 PM
Data Sourced
via MITRE·07:59 PM
DescriptionWeakness
Data Sourced
via OSV·08:15 PM
DescriptionSeverityAffected Software
Jul 23, 2020
Data Sourced
via Red Hat·04:19 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2020-0305?

CVE-2020-0305 is classified as a high severity vulnerability due to its potential for privilege escalation and denial of service.

2

How do I fix CVE-2020-0305?

To mitigate CVE-2020-0305, you should update to the recommended kernel version 0:4.18.0-240.rt7.54.el8 or 0:4.18.0-240.el8 for Red Hat systems.

3

Which systems are affected by CVE-2020-0305?

CVE-2020-0305 affects multiple Linux distributions including Red Hat, SUSE Linux, and Android 10.0.

4

What type of vulnerability is CVE-2020-0305?

CVE-2020-0305 is a use-after-free vulnerability that can cause resource starvation and potentially lead to privilege escalation.

5

Can CVE-2020-0305 be exploited remotely?

CVE-2020-0305 requires local access to exploit, meaning only privileged local users can take advantage of this vulnerability.

Company

Resources

Contact

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