CVE-2019-19581: Buffer Overflow
First published: Wed Dec 11 2019(Updated: )
An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/xen | 4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.2+76-ge1f9cb16e2-1~deb12u1 4.17.2+76-ge1f9cb16e2-1 | |
| Xen xen-unstable | >=4.8.0<=4.12.1 | |
| Fedora | =31 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/34HBFTYNMQMWIO2GGK7DB6KV4M6R5YPV/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D5R73AYE53QA32KTMHUVKCX6E52CIS43/
- https://seclists.org/bugtraq/2020/Jan/21
- https://security.gentoo.org/glsa/202003-56
- https://www.debian.org/security/2020/dsa-4602
- https://xenbits.xen.org/xsa/advisory-307.html
- https://security-tracker.debian.org/tracker/CVE-2019-19581
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D5R73AYE53QA32KTMHUVKCX6E52CIS43/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/34HBFTYNMQMWIO2GGK7DB6KV4M6R5YPV/
Frequently Asked Questions
What is the severity of CVE-2019-19581?
CVE-2019-19581 has been assessed as having a medium severity level due to the potential for denial of service.
How do I fix CVE-2019-19581?
To mitigate CVE-2019-19581, upgrade your Xen hypervisor to 4.12.1 or later versions.
Which versions of Xen are affected by CVE-2019-19581?
Xen versions from 4.8.0 up to 4.12.1 are affected by CVE-2019-19581.
What is the impact of CVE-2019-19581 on systems?
CVE-2019-19581 allows 32-bit Arm guest OS users to cause a denial of service through out-of-bounds access.
Is there a workaround for CVE-2019-19581?
There is no specific workaround for CVE-2019-19581; the recommended action is to apply available updates.
- collector/security-tracker-debian
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- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
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- agent/last-modified-date
- agent/author
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- agent/event
- agent/source
- agent/softwarecombine
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- collector/nvd-index
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- package-manager/debian
- vendor/xen
- canonical/xen xen-unstable
- version/xen xen-unstable/4.8.0
- version/xen xen-unstable/4.12.1
- vendor/fedoraproject
- canonical/fedora
- version/fedora/31