Multiple vulnerabilities in Red Hat Virtualization



Published: 2021-08-22 | Updated: 2021-10-19
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.
Public exploit code for vulnerability #4 is available.
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.

1) Race condition

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

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

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


CPE2.3 External links

http://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.

2) Command Injection

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 - Improper Neutralization of Special Elements used in a Command ('Command Injection')

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

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


CPE2.3 External links

http://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.

3) Buffer overflow

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 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: Yes

Description

The 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.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

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


CPE2.3 External links

http://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.

4) Out-of-bounds write

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

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


CPE2.3 External links

http://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.



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