Multiple vulnerabilities in Red Hat Virtualization Host 4 for RHEL 8

1) Memory leak

EUVDB-ID: #VU64079

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-1012

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient randomization in the net/ipv4/tcp.c when calculating port offsets in Linux kernel cause by small table perturb size. A remote attacker can cause memory leak and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource management error

EUVDB-ID: #VU66871

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2132

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the copy_desc_to_mbuf() function when processing Vhost header. A remote guest can send a packet with the Vhost header crossing more than two descriptors and force application to allocate all available mbufs, causing a denial of service condition for the other guest running on the hypervisor.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Use-after-free

EUVDB-ID: #VU66757

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2526

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the on_stream_io() and dns_stream_complete() functions in resolved-dns-stream.c, which do not increment the reference counting for the DnsStream object. A remote attacker can send to the system specially crafted DNS responses, trigger a use-after-free error and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Double Free

EUVDB-ID: #VU66397

Risk: Low

CVSSv3.1: 7.5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2022-2588

CWE-ID: CWE-415 - Double Free

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a double free error within the network packet scheduler implementation in the route4_change() function in Linux kernel when removing all references to a route filter before freeing it. A local user can run a specially crafted program to crash the kernel or execute arbitrary code.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

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?

Yes. This vulnerability is being exploited in the wild.

5) Path traversal

EUVDB-ID: #VU66189

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-29154

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote server to perform directory traversal attacks.

The vulnerability exists due to input validation error within the rsync client  when processing file names. A remote malicious server overwrite arbitrary files in the rsync client target directory and subdirectories on the connected peer.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Use-after-free

EUVDB-ID: #VU64668

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-2022-32250

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free incorrect NFT_STATEFUL_EXPR in net/netfilter/nf_tables_api.c in Linux kernel. A local user with ability to create user/net namespaces can execute arbitrary code with root privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

redhat-virtualization-host-productimg (Red Hat package): 4.5.0-2.el8 - 4.5.1-1.el8

redhat-release-virtualization-host (Red Hat package): 4.5.0-5.el8ev - 4.5.1-1.el8ev

Red Hat Virtualization Host: 4

Red Hat Virtualization: 4

External links

http://access.redhat.com/errata/RHSA-2022:6551

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.