CVE-2024-5138 in snapd
Summary
by MITRE • 06/01/2024
The snapctl component within snapd allows a confined snap to interact with the snapd daemon to take certain privileged actions on behalf of the snap. It was found that snapctl did not properly parse command-line arguments, allowing an unprivileged user to trigger an authorised action on behalf of the snap that would normally require administrator privileges to perform. This could possibly allow an unprivileged user to perform a denial of service or similar.
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Analysis
by VulDB Data Team • 09/07/2024
The vulnerability identified as CVE-2024-5138 resides within the snapctl component of the snapd daemon ecosystem, representing a critical authorization bypass flaw that undermines the security boundaries established by the snap confinement model. This issue specifically affects the snapd daemon's ability to properly validate command-line arguments when processing requests from confined snaps, creating a pathway for privilege escalation that directly contradicts the fundamental security principles of containerized application execution. The flaw exists in the argument parsing mechanism that governs how snapctl interprets and processes user inputs, allowing malicious actors to manipulate the command execution flow and potentially execute unauthorized administrative operations.
The technical implementation of this vulnerability stems from insufficient input validation within the snapctl component's argument parsing logic, which operates under the assumption that all commands originating from confined snaps are legitimate and properly formatted. This parsing deficiency creates a condition where unprivileged users can inject malformed arguments that bypass the normal authorization checks, effectively allowing them to impersonate the snap's privileged context and execute actions that should only be available to administrators. The vulnerability manifests when snapctl processes command-line parameters without adequate sanitization or validation, enabling attackers to manipulate the execution flow and invoke privileged operations through the snapd daemon interface.
From an operational perspective, this vulnerability presents significant risks to system integrity and availability, as it allows unprivileged users to potentially execute denial of service attacks or other malicious activities against the snapd daemon and its managed applications. The impact extends beyond simple privilege escalation to encompass potential system instability, as the compromised snap daemon could be coerced into performing unauthorized operations that disrupt normal system functionality. The vulnerability's exploitation capability means that an attacker could potentially disable critical snap services, modify system configurations, or otherwise compromise the security posture of systems running affected versions of snapd, making it particularly dangerous in enterprise environments where snap packages are extensively utilized.
Security mitigations for CVE-2024-5138 should prioritize immediate patch deployment from the snapd maintainers, as the vulnerability directly compromises the core security model of the snap confinement system. Organizations should implement additional monitoring of snapctl execution patterns and command-line argument processing within their systems to detect potential exploitation attempts. The remediation process must include comprehensive testing of patched versions to ensure that the argument parsing logic properly validates all inputs and maintains strict separation between confined snap operations and privileged administrative functions. This vulnerability aligns with CWE-20 Improper Input Validation and represents a significant concern under the ATT&CK framework's privilege escalation techniques, specifically targeting the execution of unauthorized commands through legitimate system interfaces.