SB2018081514 - Red Hat Enterprise Linux 7.4 Extended Update Support update for kernel
Published: August 15, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Side-channel attack (CVE-ID: CVE-2018-3620)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to an error in systems with microprocessors utilizing speculative execution and address translations . A local attacker can trigger terminal page fault, conduct side-channel attack and gain access to potentially sensitive information residing in the L1 data cache.
2) Speculative Store Bypass (CVE-ID: CVE-2018-3639)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.
The weakness exists due to race conditions in CPU cache processing. A local attacker can conduct a side-channel attack to exploit a flaw in the speculative execution of Load and Store instructions to read privileged memory.
Note: the vulnerability is referred to as "Spectre variant 4".
3) Information disclosure (CVE-ID: CVE-2018-3646)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to obtain potentially sensitive information on the target system.
The weakness exists on the systems with microprocessors utilizing speculative execution and address translations due to an error in Hypervisor. An adjacent attacker can access information residing in the L1 data cache via a terminal page fault and a side-channel analysis.
4) Side-channel attack (CVE-ID: CVE-2018-3646)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to obtain potentially sensitive information.
The vulnerability exists due to an error in systems with microprocessors utilizing speculative execution and address translations. An adjacent attacker with guest OS privilege can trigger terminal page fault, conduct side-channel attack and gain access to potentially sensitive information residing in the L1 data cache.
Remediation
Install update from vendor's website.