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.
References
| Link | Resource |
|---|---|
| http://xenbits.xen.org/xsa/advisory-327.html | Patch Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2020/07/07/5 | Mailing List Patch Third Party Advisory |
| https://www.debian.org/security/2020/dsa-4723 | Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ | Mailing List Third Party Advisory |
| https://security.gentoo.org/glsa/202007-02 | Third Party Advisory |
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Information
Published : 2020-07-07 06:15
Updated : 2022-05-03 06:57
NVD link : CVE-2020-15564
Mitre link : CVE-2020-15564
JSON object : View
CWE
CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
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Products Affected
debian
- debian_linux
xen
- xen
fedoraproject
- fedora