CVE Vulnerabilities

CVE-2021-21539

Time-of-check Time-of-use (TOCTOU) Race Condition

Published: Apr 30, 2021 | Modified: May 10, 2021
CVSS 3.x
7.1
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
4.6 MEDIUM
AV:N/AC:H/Au:S/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.

Weakness

The product checks the state of a resource before using that resource, but the resource’s state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

Affected Software

Name Vendor Start Version End Version
Idrac9_firmware Dell * *

Potential Mitigations

References