Infinite loop in accountsservice (Ubuntu package) - CVE-2020-16127
Published: November 11, 2020 / Updated: November 12, 2020
Vulnerability identifier: #VU48379
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2020-16127
CWE-ID: CWE-835
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: Canonical Ltd.
Affected software:
accountsservice (Ubuntu package)
accountsservice (Ubuntu package)
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in the "is_in_pam_environment" function. A local user can trigger an infinite loop by creating a symlink to "/dev/zero" and cause denial of service conditions.
How to mitigate CVE-2020-16127
Install updates from vendor's website.