Permissions, Privileges, and Access Controls in xen (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU22997

Risk: Low

CVSSv4.0: 4.8 [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 - Permissions, Privileges, and Access Controls

Exploit availability: No

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.8.2-r0 - 4.10.4-r1

CPE2.3

• cpe:2.3:a:alpine:xen_alpine_package:4.8.2-r0:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:xen_alpine_package:4.8.2-r1:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:xen_alpine_package:4.8.2-r2:*:*:*:*:alpine_linux:*:3.5

External links

https://git.alpinelinux.org/aports/commit/?id=29678cb92eeeb6dc96ec2e86481345797474ddb8
https://git.alpinelinux.org/aports/commit/?id=58d7b94f0134f00815145d95ee720d36d645c72e
https://git.alpinelinux.org/aports/commit/?id=5b04af6c9b65512ad9ff6f687e8651189bd186c5
https://git.alpinelinux.org/aports/commit/?id=8d6c01f17f4285e0142442bb8afcce72f4bd280b
https://git.alpinelinux.org/aports/commit/?id=4e803597c91a0cf312e53ce62458e81f5294c6e9

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.