Multiple vulnerabilities in Citrix Hypervisor
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2022-21123 CVE-2022-21125 CVE-2022-21127 CVE-2022-21166 CVE-2022-26362 |
| CWE-ID | CWE-200 CWE-459 CWE-362 |
| 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) Information disclosure
EUVDB-ID: #VU64364
Risk: Low
CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21123
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows an attacker to gain access to potentially sensitive information.
The vulnerability exists in Intel processors due to excessive data output when DirectPath I/O (PCI-Passthrough) is utilized. An attacker (both local and remote) with administrative access to a virtual machine that has an attached DirectPath I/O (PCI-Passthrough) device can obtain information stored in physical memory about the hypervisor or other virtual machines that reside on the same host.
Install update from vendor's website.
Vulnerable software versionsCitrix Hypervisor: 7.1 CU2 - 8.2 CU1
External linkshttp://support.citrix.com/article/CTX459954/hotfix-xs82ecu1012-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX459953/hotfix-xs71ecu2075-for-xenserver-71-cumulative-update-2
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.
2) Information disclosure
EUVDB-ID: #VU64365
Risk: Low
CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21125
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows an attacker to gain access to potentially sensitive information.
The vulnerability exists in Intel processors due to excessive data output when DirectPath I/O (PCI-Passthrough) is utilized. An attacker (both local and remote) with administrative access to a virtual machine that has an attached DirectPath I/O (PCI-Passthrough) device can obtain information stored in physical memory about the hypervisor or other virtual machines that reside on the same host.
Install update from vendor's website.
Vulnerable software versionsCitrix Hypervisor: 7.1 CU2 - 8.2 CU1
External linkshttp://support.citrix.com/article/CTX459954/hotfix-xs82ecu1012-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX459953/hotfix-xs71ecu2075-for-xenserver-71-cumulative-update-2
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) Incomplete cleanup
EUVDB-ID: #VU64376
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21127
CWE-ID:
CWE-459 - Incomplete cleanup
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to sensitive information on the system.
The vulnerability exists due to incomplete cleanup in specific special register read operations. A local user can enable information disclosure.
MitigationInstall update from vendor's website.
Vulnerable software versionsCitrix Hypervisor: 7.1 CU2 - 8.2 CU1
External linkshttp://support.citrix.com/article/CTX459954/hotfix-xs82ecu1012-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX459953/hotfix-xs71ecu2075-for-xenserver-71-cumulative-update-2
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) Information disclosure
EUVDB-ID: #VU64366
Risk: Low
CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-21166
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows an attacker to gain access to potentially sensitive information.
The vulnerability exists in Intel processors due to excessive data output when DirectPath I/O (PCI-Passthrough) is utilized. An attacker (both local and remote) with administrative access to a virtual machine that has an attached DirectPath I/O (PCI-Passthrough) device can obtain information stored in physical memory about the hypervisor or other virtual machines that reside on the same host.
MitigationInstall update from vendor's website.
Vulnerable software versionsCitrix Hypervisor: 7.1 CU2 - 8.2 CU1
External linkshttp://support.citrix.com/article/CTX459954/hotfix-xs82ecu1012-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX459953/hotfix-xs71ecu2075-for-xenserver-71-cumulative-update-2
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.
5) Race condition
EUVDB-ID: #VU64446
Risk: High
CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-26362
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to race condition in typeref acquisition Xen. A remote attacker can execute arbitrary code on the target system.
MitigationInstall update from vendor's website.
Vulnerable software versionsCitrix Hypervisor: 7.1 CU2 - 8.2 CU1
External linkshttp://support.citrix.com/article/CTX459954/hotfix-xs82ecu1012-for-citrix-hypervisor-82-cumulative-update-1
http://support.citrix.com/article/CTX459953/hotfix-xs71ecu2075-for-xenserver-71-cumulative-update-2
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.
