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Vulnerability Details : CVE-2019-18422

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.
Publish Date : 2019-10-31 Last Update Date : 2019-11-17
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- CVSS Scores & Vulnerability Types

CVSS Score
8.5
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication ???
Gained Access None
Vulnerability Type(s) Denial Of ServiceGain privileges
CWE ID 732

- Products Affected By CVE-2019-18422

# Product Type Vendor Product Version Update Edition Language
1 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
XEN XEN 1

- References For CVE-2019-18422

https://www.debian.org/security/2020/dsa-4602
DEBIAN DSA-4602
https://lists.fedoraproject.org/archives/list/[email protected]/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
FEDORA FEDORA-2019-cbb732f760
https://lists.fedoraproject.org/archives/list/[email protected]/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
FEDORA FEDORA-2019-376ec5c107
https://lists.fedoraproject.org/archives/list/[email protected]/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
FEDORA FEDORA-2019-865bb16900
http://www.openwall.com/lists/oss-security/2019/10/31/5
MLIST [oss-security] 20191031 Xen Security Advisory 303 v4 (CVE-2019-18422) - ARM: Interrupts are unconditionally unmasked in exception handlers
http://xenbits.xen.org/xsa/advisory-303.html
https://seclists.org/bugtraq/2020/Jan/21
BUGTRAQ 20200114 [SECURITY] [DSA 4602-1] xen security update

- Metasploit Modules Related To CVE-2019-18422

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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