Detections
Analytics

Xen / ARM Boot Modules Are Not Scrubbed Information Exposure (XSA-372)

medium Nessus Plugin ID 152209

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by an information disclosure vulnerability as boot modules are not scrubbed. The bootloader will load boot modules (e.g.
 kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must 'scrub' them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the appropriate patch according to the vendor advisory.

See Also

https://xenbits.xenproject.org/xsa/advisory-372.txt

Plugin Details

Severity: Medium

ID: 152209

File Name: xen_server_XSA-372.nasl

Version: 1.4

Type: local

Family: Misc.

Published: 8/4/2021

Updated: 1/26/2022

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2021-28693

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:xen:xen

Required KB Items: Settings/ParanoidReport, installed_sw/Xen Hypervisor

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2021

Vulnerability Publication Date: 6/30/2021

Reference Information

CVE: CVE-2021-28693

IAVB: 2021-B-0044-S