CVE-2020-15564

Vulnerability Description

An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://www.openwall.com/lists/oss-security/2020/07/07/5Mailing ListPatchThird Party Advisory
• http://xenbits.xen.org/xsa/advisory-327.htmlPatchThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://security.gentoo.org/glsa/202007-02Third Party Advisory
• https://www.debian.org/security/2020/dsa-4723Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/07/5Mailing ListPatchThird Party Advisory
• http://xenbits.xen.org/xsa/advisory-327.htmlPatchThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://security.gentoo.org/glsa/202007-02Third Party Advisory
• https://www.debian.org/security/2020/dsa-4723Third Party Advisory