CVE-2022-45873 : Security Advisory and Response
Discover the impact of CVE-2022-45873, where systemd 250 and 251 are prone to a local user-induced systemd-coredump deadlock due to crash triggers. Learn about the exploitation and mitigation.
A systemd vulnerability in versions 250 and 251 could allow local users to create a systemd-coredump deadlock by triggering a crash with a long backtrace. This exploit involves crashing a binary recursively and placing it in a deeply nested directory to cause a deadlock.
Understanding CVE-2022-45873
This CVE affects systemd versions 250 and 251, enabling local users to trigger a systemd-coredump deadlock through a crash with an extensive backtrace.
What is CVE-2022-45873?
The vulnerability in systemd versions 250 and 251 permits local users to induce a systemd-coredump deadlock via a crash scenario with a lengthy backtrace.
The Impact of CVE-2022-45873
The exploit targets the parse_elf_object function in shared/elf-util.c, requiring 16 recursive crashes for triggering a deadlock when MaxConnections=16 is configured for systemd/units/systemd-coredump.socket.
Technical Details of CVE-2022-45873
The technical aspects of the CVE-2022-45873 vulnerability include:
Vulnerability Description
The flaw enables local users to execute a systemd-coredump deadlock by crashing a binary recursively with a long backtrace.
Affected Systems and Versions
systemd versions 250 and 251 are impacted by this vulnerability, exposing them to the systemd-coredump deadlock exploit.
Exploitation Mechanism
The exploit involves crashing a binary repeatedly by calling the same function recursively and placing it in a deeply nested directory to create a deadlock scenario.
Mitigation and Prevention
To address CVE-2022-45873, consider the following mitigation strategies:
Immediate Steps to Take
- Update systemd to a non-vulnerable version
- Implement strict directory access controls to prevent deep nesting of executable files
Long-Term Security Practices
- Regularly monitor and review systemd configurations and settings
- Conduct security training for users on safe system practices
Patching and Updates
- Apply relevant patches provided by systemd to fix the vulnerability
- Keep systemd up-to-date with the latest security releases