SB2019123143 - Resource management error in xen (Alpine package)

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Main Vulnerability Database SB2019123143

SB2019123143 - Resource management error in xen (Alpine package)

Published: December 31, 2019

Security Bulletin ID SB2019123143
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Resource management error (CVE-ID: CVE-2019-18423)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to the p2m_get_root_pointer() function in Xen ignores the unused top bits of a guest physical frame. A remote administrator of a guest operating system can use a specially crafted hypercall XENMEM_add_to_physmap{, _batch} followed by an access to an address (via hypercall or direct access) that passes the sanity check but cause p2m_get_root_pointer() to return NULL. As a result, the attacker can crash the hypervisor from the guest operating system.


Remediation

Install update from vendor's website.

References