Time-of-check Time-of-use (TOCTOU) Race Condition in iDRAC9 - CVE-2021-21539
Published: August 9, 2022
Vulnerability identifier: #VU66212
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-21539
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to a Time-of-check Time-of-use (TOCTOU) race condition. A remote unauthenticated attacker can exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.
Affected software
iDRAC9
EMC Data Domain
EMC Data Domain
How to mitigate CVE-2021-21539
Install updates from vendor's website.
iDRAC9 - update to 4.40.40.00
EMC Data Domain - addressed in versions 6.2.1.60, 7.2.0.70, 7.6.0.7
EMC Data Domain - addressed in versions 6.2.1.60, 7.2.0.70, 7.6.0.7