Permissions, Privileges, and Access Controls in Xen - CVE-2019-19579
Published: November 26, 2019 / Updated: December 5, 2019
Vulnerability identifier: #VU22997
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-19579
CWE-ID: CWE-264
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Xen Project
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to an error within the PCI device assignment process that allows usage of alternative methods in Xen. A remote attacker with access to the guest OS and a physical device can gain write data into memory on the host operating system.
Successful exploitation of the vulnerability may allow a remote attacker to escalate privileges on the host operating system.
How to mitigate CVE-2019-19579
Apply the following patches:
xsa306.patch xen-unstable xsa306-4.12.patch Xen 4.12.x xsa306-4.11.patch Xen 4.11.x, Xen 4.10.x xsa306-4.9.patch Xen 4.9.x, Xen 4.8.x $ sha256sum xsa306* 07468dcdfbe34b794fd0618bce7d6d1edb6b10b234dccf1e5dd1f1120a0affe7 xsa306.meta 3534ec46f03bb8dac3011e0e3739fc75400559078e4361bbe5385d97b7892650 xsa306.patch 426e32bfa7d7787fe6778685e623966f8762857f7920443a0ca73347df9d6624 xsa306-4.9.patch b00e58c9f96b0ff654dfd4904c675a54356148af718eb9b2adca0253b900dfc1 xsa306-4.11.patch 69857d08969903452fbf009905a145e06a5aef9966e969de9fbb22e62c557ffd xsa306-4.12.patch