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CVE-2020-0543

Publication date 9 June 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

Incomplete cleanup from specific special register read operations in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access.

From the Ubuntu Security Team

It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information.

Read the notes from the security team

Status

Package Ubuntu Release Status
intel-microcode 24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
20.10 groovy
Fixed 3.20200609.0ubuntu0.20.04.0
20.04 LTS focal
Fixed 3.20200609.0ubuntu0.20.04.0
19.10 eoan
Fixed 3.20200609.0ubuntu0.19.10.0
19.04 disco Ignored end of life
18.04 LTS bionic
Fixed 3.20200609.0ubuntu0.18.04.0
16.04 LTS xenial
Fixed 3.20200609.0ubuntu0.16.04.0
14.04 LTS trusty
xen 24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Fixed 4.11.3+24-g14b62ab3e5-1ubuntu2.3
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Not in release

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Notes

tyhicks

This issue only affects Intel client and Xeon E3 processors

sbeattie

also known as "CrossTalk"

sbeattie

Affected processor families: ============= ============ ======== common name Family_Model Stepping ============= ============ ======== IvyBridge 06_3AH All Haswell 06_3CH All Haswell_L 06_45H All Haswell_G 06_46H All Broadwell_G 06_47H All Broadwell 06_3DH All Skylake_L 06_4EH All Skylake 06_5EH All Kabylake_L 06_8EH <= 0xC Kabylake 06_9EH <= 0xD ============= ============ ========

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4387-1
    • Linux kernel vulnerabilities
    • 10 June 2020
    • USN-4391-1
    • Linux kernel vulnerabilities
    • 11 June 2020
    • USN-4390-1
    • Linux kernel vulnerabilities
    • 11 June 2020
    • USN-4385-1
    • Intel Microcode vulnerabilities
    • 9 June 2020
    • USN-4389-1
    • Linux kernel vulnerabilities
    • 10 June 2020
    • USN-4392-1
    • Linux kernel vulnerabilities
    • 10 June 2020
    • USN-4388-1
    • Linux kernel vulnerabilities
    • 9 June 2020
    • USN-4393-1
    • Linux kernel vulnerabilities
    • 10 June 2020
    • LSN-0068-1
    • Kernel Live Patch Security Notice
    • 9 June 2020
    • USN-5617-1
    • Xen vulnerabilities
    • 19 September 2022

Other references