A vulnerability in GNOME Display Manager (GDM) could allow a local attacker to bypass security restrictions on a targeted system.
The vulnerability is due to improper security restrictions imposed by the affected software when timed login is enabled. A local attacker with physical access could exploit this vulnerability by selecting the timed login user and waiting for the timer to expire on the targeted system. A successful exploit could allow the attacker to bypass security restrictions and gain access to the logged-in user’s session on the targeted system.
GNOME has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must have physical access
to the targeted system. This access requirement may reduce the
likelihood of a successful exploit.
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.
GNOME released an issue report at the following link: Issue #460
GNOME released software updates at the following link: GDM 3.31.4
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.