SB2019103020 - Multiple vulnerabilities in Red Hat Virtualization Hosts (RHVH)
Published: October 30, 2019 Updated: February 27, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-14287)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists in the implementation of the "sudo" application when processing commands that are configured to run with ALL keyword. A local user with privileges to use sudo for specific applications on the system can escalate privileges and run the application as root (even if precisely restricted), if user id "-1" or "4294967295" is used.
Example:
The following entry instructs sudo to allow user bob to run "/usr/bin/id" command as any user on the system but root:
myhost bob = (ALL, !root) /usr/bin/id
The following command will allow bob execute the "/usr/bin/id" command as root:
sudo -u#-1 id -u
2) Information disclosure (CVE-ID: CVE-2019-1125)
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:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information and elevate privileges on the system.
The vulnerability exists when certain central processing units (CPU) speculatively access memory. A local user can gain unauthorized access to sensitive information and elevate privileges on the system.
This issue is a variant of the Spectre Variant 1 speculative execution side channel vulnerability that leverages SWAPGS instructions to bypass KPTI/KVA mitigations.
Remediation
Install update from vendor's website.