systemd DynamicUser Property Privilege Escalation Vulnerability [CVE-2019-3844]
CVE Number – CVE-2019-3844
A vulnerability in systemd could allow a local attacker to elevate their privileges on a targeted system.The vulnerability occurs when the DynamicUser property is used to execute a Set-user Identification (SUID) binary on a targeted system. An attacker could exploit this vulnerability by leveraging a flaw in the binary execution process. A successful exploit could allow the attacker to elevate their privileges on the targeted system. systemd has confirmed the vulnerability and released software updates.
Analysis
- To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement may reduce the likelihood of a successful exploit.
Safeguards
- Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to access local systems.Administrators are advised to allow only privileged users to access administration or management systems.Administrators are advised to monitor critical systems.
Vendor Announcements
- systemd has issued a bug report at the following link: DynamicUser Binary
Fixed Software
- systemd has issued patches at the following link: DynamicUsers Binaries Patches
I am one of the editors here at www.systemtek.co.uk I am a UK based technology professional, with an interest in computer security and telecoms.