Fedora 38 update for xen



Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2022-42331
CVE-2022-42332
CVE-2022-42333
CVE-2022-42334
CWE-ID CWE-1037
CWE-416
CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

xen
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Processor optimization removal or modification of security-critical code

EUVDB-ID: #VU73892

Risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-42331

CWE-ID: CWE-1037 - Processor optimization removal or modification of security-critical code

Exploit availability: No

Description

The vulnerability allows an attacker to escalate privileges on the system.

The vulnerability exists due to an oversight in the very original Spectre/Meltdown security work (XSA-254) caused by an unprotected RET instruction. An attacker with access to the guest OS can infer the contents of arbitrary host memory, including memory assigned to other guests.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 38

xen: before 4.17.0-8.fc38

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2023-703f133eb3


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Use-after-free

EUVDB-ID: #VU73893

Risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-42332

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when guests are running in the shadow mode. An attacker with access to the guest OS can trigger a use-after-free error and escalate privileges on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 38

xen: before 4.17.0-8.fc38

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2023-703f133eb3


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU73894

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-42333

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows an attacker to perform a denial of service attack or escalate privileges on the system.

The vulnerability exists due to mishandling of pinned cache attributes, related to unbound number of controlled regions. An attacker controlling HVM guests can perform a denial of service (DoS) attack and potentially escalate privileges.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 38

xen: before 4.17.0-8.fc38

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2023-703f133eb3


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.

4) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU73895

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-42334

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows an attacker to perform a denial of service attack or escalate privileges on the system.

The vulnerability exists due to mishandling of pinned cache attributes, related to improper serialization of installation and removal of regions. An attacker controlling HVM guests can perform a denial of service (DoS) attack and potentially escalate privileges.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 38

xen: before 4.17.0-8.fc38

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2023-703f133eb3


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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