CVE - CVE-2019-18422

CVE-ID
CVE-2019-18422	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20200114 [SECURITY] [DSA 4602-1] xen security update URL:https://seclists.org/bugtraq/2020/Jan/21 DEBIAN:DSA-4602 URL:https://www.debian.org/security/2020/dsa-4602 FEDORA:FEDORA-2019-376ec5c107 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/ FEDORA:FEDORA-2019-865bb16900 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/ FEDORA:FEDORA-2019-cbb732f760 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/ MISC:http://xenbits.xen.org/xsa/advisory-303.html MLIST:[oss-security] 20191031 Xen Security Advisory 303 v4 (CVE-2019-18422) - ARM: Interrupts are unconditionally unmasked in exception handlers URL:http://www.openwall.com/lists/oss-security/2019/10/31/5
Assigning CNA
MITRE Corporation
Date Record Created
20191024	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20191024)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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