CVE-2019-19581

Vulnerability Description

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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• 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.htmlPatchVendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• 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.htmlPatchVendor Advisory