CVE-2021-28698

CVE-2021-28698 is described in CTX325319 as a Xen-related issue affecting Citrix Hypervisor where a malicious privileged code in a guest VM could cause host denial of service or host compromise, under conditions such as PCI passthrough with identity-mapped memory regions and multiple vCPUs. Citri...

CVE-2021-28698

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones...

CVE-2021-28698

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones...

CVE-2021-28699

inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can b...

CVE-2021-28699

CVE-2021-28699 affects Xen-based platforms (Citrix Hypervisor and Xen). The issue is an inadequate bounds check in the grant table status path: translation of the grant-status frame numbers can exceed allocated translation space, allowing writes beyond the intended area. Citrix shows this as a ho...

CVE-2021-28699

inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can b...

CVE-2021-28699

inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can b...

PT-2021-6610 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen affected versions not specified Description: The issue is related to long running loops in grant table handling. Xen maintains information on grant mappings a domain may create to map grants offered by other domains. When carrying out...

PT-2021-6804 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen affected versions not specified Description: The issue is related to the management of grant table v2 status pages in Xen. When a guest switches from v2 to v1, these pages get de-allocated, but the hypervisor may not correctly track their...

PT-2021-6611 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen affected versions not specified Description: The issue is related to an inadequate grant-v2 status frames array bounds check in the Xen hypervisor. This allows a guest to potentially cause a denial of service by exploiting the vulnerabili...

CVE-2021-28698

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones...

CVE-2021-28697

grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest...

CVE-2021-28699

inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can b...

grant table v2 status pages may remain accessible after de-allocation

ISSUE DESCRIPTION Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched back from v2 to v1. The freeing of such...

inadequate grant-v2 status frames array bounds check

ISSUE DESCRIPTION The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can be accessed through. For 32-bit gues...

long running loops in grant table handling

ISSUE DESCRIPTION In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use...

Xen 竞争条件问题漏洞

Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. Xen has a security vulnerability that can be...

Xen 安全漏洞

Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. Xen has a security vulnerability that can be...

Xen 安全漏洞

Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. effect is a software package for adding...

Metasploit Wrap-Up

Print Driver PrivEsc If you attended DEF CON last week, you may have seen this talk on print driver vulnerabilities from Metasploit community contributor Jacob Baines. In the spirit of Friday the 13th, we're highlighting some of these "print nightmares" again, in the form of two new Metasploit...