Security News > 2021 > March > Citrix Patches DoS Vulnerabilities in Hypervisor
Vulnerabilities Citrix patched in Hypervisor this week could allow for code executed in a virtual machine to cause denial of service on the host.
Tracked as CVE-2021-28038 and CVE-2021-28688, the newly addressed vulnerabilities could be abused to cause the host to crash or become unresponsive.
The two vulnerabilities were found to impact all currently supported Hypervisor versions, including version 8.2 LTSR. CVE-2021-28038 is a vulnerability identified in Linux kernel through 5.11.3, as used with Xen PV, and exists because of the lack of the necessary treatment for errors in the netback driver, leading to the host OS denial of service "During misbehavior of a networking frontend driver."
Citrix this week also patched a third vulnerability that affects Hypervisor 8.2 LTSR only, and which could result in malicious network traffic causing subsequent packets to be dropped.
The tech giant has released hotfixes that patch these vulnerabilities and is urging customers to apply these hotfixes as soon as possible.
"Citrix has released security updates to address vulnerabilities in Hypervisor. An attacker could exploit some of these vulnerabilities to cause a denial-of-service condition," CISA notes.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2021-04-06 | CVE-2021-28688 | Improper Initialization vulnerability in multiple products The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. | 2.1 |
| 2021-03-05 | CVE-2021-28038 | Allocation of Resources Without Limits or Throttling vulnerability in multiple products An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. | 6.5 |