Virtuozzo 7 : readykernel-patch (VZA-2018-030)
medium Nessus Plugin ID 109922
Synopsis
The remote Virtuozzo host is missing a security update.Description
According to the version of the vzkernel package and the readykernel-patch installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :- A flaw was found in how KVM handled exceptions delivered after Mov SS or Pop SS instructions have encountered a breakpoint. As a result, exceptions passed to the guest kernel could have wrong values on the stack. An unprivileged KVM guest user could use this flaw to crash the guest kernel or, potentially, escalate their privileges in the guest system.
- The implementation of ptrace in the kernel does not handle errors correctly when working with the debug registers. As a result, the hardware breakpoints could become corrupted. An unprivileged user could exploit this flaw to crash the kernel resulting in a denial-of-service, or, potentially, to escalate their privileges in the system.
Note that Tenable Network Security has extracted the preceding description block directly from the Virtuozzo security advisory.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
Solution
Update the readykernel patch.See Also
https://help.virtuozzo.com/customer/portal/articles/2939806
https://access.redhat.com/security/cve/cve-2018-1000199
https://access.redhat.com/security/cve/cve-2018-1087
http://www.nessus.org/u?b27522be
http://www.nessus.org/u?73654fa9
http://www.nessus.org/u?f2e37994
http://www.nessus.org/u?fb804d30
http://www.nessus.org/u?df964cee
http://www.nessus.org/u?042c4699
Plugin Details
Severity: Medium
ID: 109922
File Name: Virtuozzo_VZA-2018-030.nasl
Version: 1.7
Type: local
Family: Virtuozzo Local Security Checks
Published: 5/21/2018
Updated: 1/4/2021
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: Medium
Base Score: 4.9
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C
CVSS v3
Risk Factor: Medium
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability Information
CPE: p-cpe:/a:virtuozzo:virtuozzo:readykernel, cpe:/o:virtuozzo:virtuozzo:7
Required KB Items: Host/local_checks_enabled, Host/Virtuozzo/release, Host/Virtuozzo/rpm-list, Host/readykernel-info
Patch Publication Date: 5/17/2018