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CVE-2019-18420

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202003-56
Posted Mar 26, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202003-56 - Multiple vulnerabilities have been found in Xen, the worst of which could allow for privilege escalation. Versions less than 4.12.0-r1 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2018-12207, CVE-2019-11091, CVE-2019-11135, CVE-2019-18420, CVE-2019-18421, CVE-2019-18423, CVE-2019-18424, CVE-2019-18425, CVE-2019-19577, CVE-2019-19578, CVE-2019-19580, CVE-2019-19581, CVE-2019-19582, CVE-2019-19583
SHA-256 | 7959dee17cd4227918a51fda5daa8418f726f545d628a763b80ddbb67566d1eb
Debian Security Advisory 4602-1
Posted Jan 15, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4602-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in denial of service, guest-to-host privilege escalation or information leaks.

tags | advisory, denial of service, vulnerability
systems | linux, debian
advisories | CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2018-12207, CVE-2019-11091, CVE-2019-11135, CVE-2019-17340, CVE-2019-17341, CVE-2019-17342, CVE-2019-17343, CVE-2019-17344, CVE-2019-17345, CVE-2019-17346, CVE-2019-17347, CVE-2019-17348, CVE-2019-17349, CVE-2019-17350, CVE-2019-18420, CVE-2019-18421, CVE-2019-18422, CVE-2019-18423, CVE-2019-18424, CVE-2019-18425, CVE-2019-19577, CVE-2019-19578, CVE-2019-19579
SHA-256 | e5bfcc7743f4984f6ecac091e3a281590c7e7e3caf0c70d6d0dbc7576bed566f
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