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Vulnerability Details : CVE-2019-18420

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.
Publish Date : 2019-10-31 Last Update Date : 2020-08-24
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- CVSS Scores & Vulnerability Types

CVSS Score
6.3
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
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 Service
CWE ID 134

- Products Affected By CVE-2019-18420

# 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-2019-18420

https://seclists.org/bugtraq/2020/Jan/21
BUGTRAQ 20200114 [SECURITY] [DSA 4602-1] xen security update
https://www.debian.org/security/2020/dsa-4602
DEBIAN DSA-4602
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
FEDORA FEDORA-2019-cbb732f760
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
FEDORA FEDORA-2019-376ec5c107
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html
SUSE openSUSE-SU-2019:2506
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
FEDORA FEDORA-2019-865bb16900
http://www.openwall.com/lists/oss-security/2019/10/31/1
MLIST [oss-security] 20191031 Xen Security Advisory 296 v4 (CVE-2019-18420) - VCPUOP_initialise DoS
http://xenbits.xen.org/xsa/advisory-296.html
https://security.gentoo.org/glsa/202003-56
GENTOO GLSA-202003-56

- Metasploit Modules Related To CVE-2019-18420

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


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