Multiple vulnerabilities in Citrix Hypervisor



Published: 2023-10-11
Risk Medium
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2023-34326
CVE-2022-1304
CVE-2023-34324
CVE-2023-34327
CVE-2023-20588
CWE-ID CWE-264
CWE-787
CWE-833
CWE-371
CWE-369
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Citrix Hypervisor
Server applications / Virtualization software

Vendor Citrix

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU81883

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-34326

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

Exploit availability: No

Description

The vulnerability allows a remote guest to escalate privileges on the system.

The vulnerability exists due to missing IOMMU TLB flushing on x86/AMD systems. A malicious guest can access memory not owned by the guest and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Citrix Hypervisor: 8.2 CU1

External links

http://support.citrix.com/article/CTX575089
http://support.citrix.com/article/CTX575070/hotfix-xs82ecu1047-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX579955/hotfix-xs82ecu1049-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX580401/hotfix-xs82ecu1051-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581053/hotfix-xs82ecu1052-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581108/hotfix-xs82ecu1054-for-citrix-hypervisor-82-cumulative-update-1


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) Out-of-bounds write

EUVDB-ID: #VU64075

Risk: Low

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-2022-1304

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input. A local attacker can use a specially crafted filesystem, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Citrix Hypervisor: 8.2 CU1

External links

http://support.citrix.com/article/CTX575089
http://support.citrix.com/article/CTX575070/hotfix-xs82ecu1047-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX579955/hotfix-xs82ecu1049-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX580401/hotfix-xs82ecu1051-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581053/hotfix-xs82ecu1052-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581108/hotfix-xs82ecu1054-for-citrix-hypervisor-82-cumulative-update-1


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) Deadlock

EUVDB-ID: #VU81900

Risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-34324

CWE-ID: CWE-833 - Deadlock

Exploit availability: No

Description

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to improper event handling in Linux kernel. A malicious guest can disable paravirtualized device to cause a deadlock in a backend domain (other than dom0).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Citrix Hypervisor: 8.2 CU1

External links

http://support.citrix.com/article/CTX575089
http://support.citrix.com/article/CTX575070/hotfix-xs82ecu1047-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX579955/hotfix-xs82ecu1049-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX580401/hotfix-xs82ecu1051-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581053/hotfix-xs82ecu1052-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581108/hotfix-xs82ecu1054-for-citrix-hypervisor-82-cumulative-update-1


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.

4) State Issues

EUVDB-ID: #VU81901

Risk: Low

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

CVE-ID: CVE-2023-34327

CWE-ID: CWE-371 - State Issues

Exploit availability: No

Description

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of guest state when using Debug Masks in HVM vCPU. A malicious guest can perform a denial of service (DoS) attack against the guest OS.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Citrix Hypervisor: 8.2 CU1

External links

http://support.citrix.com/article/CTX575089
http://support.citrix.com/article/CTX575070/hotfix-xs82ecu1047-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX579955/hotfix-xs82ecu1049-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX580401/hotfix-xs82ecu1051-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581053/hotfix-xs82ecu1052-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581108/hotfix-xs82ecu1054-for-citrix-hypervisor-82-cumulative-update-1


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.

5) Division by zero

EUVDB-ID: #VU79239

Risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20588

CWE-ID: CWE-369 - Divide By Zero

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a divide by zero error that can return speculative data. A local user can gain access to potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Citrix Hypervisor: 8.2 CU1

External links

http://support.citrix.com/article/CTX575089
http://support.citrix.com/article/CTX575070/hotfix-xs82ecu1047-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX579955/hotfix-xs82ecu1049-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX580401/hotfix-xs82ecu1051-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581053/hotfix-xs82ecu1052-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX581108/hotfix-xs82ecu1054-for-citrix-hypervisor-82-cumulative-update-1


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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