CVE-2020-15564: Buffer Overflow
First published: Tue Jul 07 2020(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | >=4.8.0<=4.13.1 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| debian/xen | 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.3+10-g091466ba55-1~deb12u1 4.17.3+36-g54dacb5c02-1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2020/07/07/5
- http://xenbits.xen.org/xsa/advisory-327.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
- https://security.gentoo.org/glsa/202007-02
- https://www.debian.org/security/2020/dsa-4723
- https://launchpad.net/bugs/cve/CVE-2020-15564
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
- https://xenbits.xen.org/xsa/advisory-327.html
- https://security-tracker.debian.org/tracker/CVE-2020-15564
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15564
- https://nvd.nist.gov/vuln/detail/CVE-2020-15564
- https://ubuntu.com/security/CVE-2020-15564
Frequently Asked Questions
What is CVE-2020-15564?
CVE-2020-15564 is a vulnerability in Xen that allows Arm guest OS users to cause a hypervisor crash due to a missing alignment check in VCPUOP_register_vcpu_info.
How does CVE-2020-15564 affect Xen?
CVE-2020-15564 affects Xen versions up to 4.13.x.
What is the impact of CVE-2020-15564?
The impact of CVE-2020-15564 is that Arm guest OS users can cause a hypervisor crash.
How can the vulnerability CVE-2020-15564 be fixed?
The vulnerability CVE-2020-15564 can be fixed by updating Xen to version 4.11.3+24- or higher.
Where can I find more information about CVE-2020-15564?
You can find more information about CVE-2020-15564 on the Xen advisory page (http://xenbits.xen.org/xsa/advisory-327.html) and the Debian security advisory page (https://www.debian.org/security/2020/dsa-4723).
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