CVE-2022-39318

Description

A division-by-zero issue was found in FreeRDP's libusb_udevice.c in the urbdrc channel. This flaw exists due to missing input validation in the urbdrc channel. A malicious server can pass specially crafted data to the client, causing a crash and denial of service.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score4.85.7N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityHighLowN/A
Privileges RequiredLowLowN/A
User InteractionRequiredRequiredN/A
ScopeUnchangedUnchangedN/A
ConfidentialityNoneNoneN/A
Integrity ImpactNoneNoneN/A
Availability ImpactHighHighN/A

Vector

Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Red Hat CVSS v3 Score Explanation

AC:H, An attacker must have control of an RDP server to which the victim/client connects.

The availability impact is set to 'High', as full termination would be the worst theoretical outcome, However, setting it to 'low' would bring the CVSS score down to a 2.6, which would be a better reflection of the expected real world impact of this issue, because if a crash occurred, it would be only on the client, not the server.

Understanding the Weakness (CWE)

CWE-369

Availability

Technical Impact: DoS: Crash, Exit, or Restart

A Divide by Zero results in a crash.

Acknowledgements

Upstream acknowledges Team BT5 (BoB 11th) as the original reporter.

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