Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 4 |
CVE-ID | CVE-2021-3609 CVE-2021-3621 CVE-2021-22543 CVE-2021-22555 |
CWE-ID | CWE-362 CWE-77 CWE-119 CWE-787 |
Exploitation vector | Local |
Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #3 is available. Vulnerability #4 is being exploited in the wild. |
Vulnerable software Subscribe |
redhat-virtualization-host (Red Hat package) Operating systems & Components / Operating system package or component redhat-release-virtualization-host (Red Hat package) Operating systems & Components / Operating system package or component imgbased (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Virtualization Host Web applications / Remote management & hosting panels Red Hat Virtualization Server applications / Virtualization software |
Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
EUVDB-ID: #VU54292
Risk: Medium
CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2021-3609
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in the CAN BCM networking protocol (net/can/bcm.c) in the Linux kernel ranging from version 2.6.25 to mainline 5.13-rc6. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
MitigationInstall updates from vendor's website.
redhat-virtualization-host (Red Hat package): 4.4.7-20210715.1.el8_4
redhat-release-virtualization-host (Red Hat package): 4.4.7-3.el8ev
imgbased (Red Hat package): 1.2.12-0.1.el8ev - 1.2.21-1.el8ev
Red Hat Virtualization Host: 4
Red Hat Virtualization: 4
External linkshttp://access.redhat.com/errata/RHSA-2021:3235
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
EUVDB-ID: #VU56000
Risk: Medium
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3621
CWE-ID:
CWE-77 - Command injection
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper input validation in the sssctl command within the logs-fetch and cache-expire subcommands. An attacker can trick the root user into running a specially crafted sssctl command, such as via sudo, and execute arbitrary code with root privileges.
Install updates from vendor's website.
redhat-virtualization-host (Red Hat package): 4.4.7-20210715.1.el8_4
redhat-release-virtualization-host (Red Hat package): 4.4.7-3.el8ev
imgbased (Red Hat package): 1.2.12-0.1.el8ev - 1.2.21-1.el8ev
Red Hat Virtualization Host: 4
Red Hat Virtualization: 4
External linkshttp://access.redhat.com/errata/RHSA-2021:3235
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU56018
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2021-22543
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Linux kernel when handling VM_IO|VM_PFNMAP vmas in KVM. A local user can can bypass RO checks and cause the pages to get freed while still accessible by the VMM and guest. As a result, an attacker with the ability to start and control a VM to read/write random pages of memory, can trigger memory corruption and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
redhat-virtualization-host (Red Hat package): 4.4.7-20210715.1.el8_4
redhat-release-virtualization-host (Red Hat package): 4.4.7-3.el8ev
imgbased (Red Hat package): 1.2.12-0.1.el8ev - 1.2.21-1.el8ev
Red Hat Virtualization Host: 4
Red Hat Virtualization: 4
External linkshttp://access.redhat.com/errata/RHSA-2021:3235
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
EUVDB-ID: #VU56017
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-22555
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
Description The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when processing untrusted input in net/netfilter/x_tables.c in Linux kernel. A local user can run a specially crafted program to trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
redhat-virtualization-host (Red Hat package): 4.4.7-20210715.1.el8_4
redhat-release-virtualization-host (Red Hat package): 4.4.7-3.el8ev
imgbased (Red Hat package): 1.2.12-0.1.el8ev - 1.2.21-1.el8ev
Red Hat Virtualization Host: 4
Red Hat Virtualization: 4
External linkshttp://access.redhat.com/errata/RHSA-2021:3235
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.