x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Due to too lax a check in one of the hypervisor routines used for shadow page handling it is possible for a guest with a PCI device passed through to cause the hypervisor to access an arbitrary pointer partially under guest control.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 4.17.0 (including) | 4.17.0 (including) |
| Xen | Ubuntu | bionic | * |
| Xen | Ubuntu | focal | * |
| Xen | Ubuntu | kinetic | * |
| Xen | Ubuntu | lunar | * |
| Xen | Ubuntu | mantic | * |
| Xen | Ubuntu | oracular | * |
| Xen | Ubuntu | plucky | * |
| Xen | Ubuntu | trusty | * |
| Xen | Ubuntu | xenial | * |
Potential Mitigations
References
- http://www.openwall.com/lists/oss-security/2023/04/25/1
- http://xenbits.xen.org/xsa/advisory-430.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://security.gentoo.org/glsa/202402-07
- https://xenbits.xenproject.org/xsa/advisory-430.txt
- http://www.openwall.com/lists/oss-security/2023/04/25/1
- http://xenbits.xen.org/xsa/advisory-430.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://security.gentoo.org/glsa/202402-07
- https://xenbits.xenproject.org/xsa/advisory-430.txt