Race condition in Zstandard - #VU50841
Published: February 22, 2021 / Updated: March 4, 2021
Vulnerability identifier: #VU50841
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/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: N/A
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Facebook Inc.
Affected software:
Zstandard
Zstandard
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition when creating files. The application creates a files with the default umask before chmod'ing to down to 0600. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
Remediation
Install update from vendor's website.