CVE-2023-7093 in kylin-system-updater
Summary
by MITRE • 12/25/2023
A vulnerability classified as critical has been found in KylinSoft kylin-system-updater up to 2.0.5.16-0k2.33. Affected is an unknown function of the file /usr/share/kylin-system-updater/SystemUpdater/UpgradeStrategiesDbus.py of the component com.kylin.systemupgrade Service. The manipulation of the argument SetDownloadspeedMax leads to os command injection. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-248940. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 01/18/2024
The vulnerability identified as CVE-2023-7093 represents a critical os command injection flaw within KylinSoft kylin-system-updater version 2.0.5.16-0k2.33 and earlier. This security weakness resides in the SystemUpdater/UpgradeStrategiesDbus.py file, specifically within the com.kylin.systemupgrade Service component. The vulnerability is triggered when manipulating the SetDownloadspeedMax argument, which allows an attacker to inject arbitrary operating system commands through improper input validation. The attack vector requires local system access, making it a privilege escalation vulnerability that can be exploited by users with existing system access. This type of vulnerability falls under CWE-78 which specifically addresses OS Command Injection, where insufficient sanitization of user-supplied data allows execution of arbitrary commands with the privileges of the affected application.
The operational impact of this vulnerability is significant as it enables local attackers to execute arbitrary commands on the system with the privileges of the kylin-system-updater service. This could potentially allow an attacker to escalate privileges, access sensitive system information, modify system configurations, or even install malicious software. The fact that this vulnerability has been publicly disclosed and is known to be exploitable increases the risk profile considerably. Attackers with local access could leverage this flaw to gain unauthorized control over the system, potentially leading to complete system compromise. The vulnerability's classification as critical indicates that it represents a severe threat to system integrity and security, particularly in environments where local access might be obtained through various means such as legitimate user accounts or other exploited services.
Security professionals should consider this vulnerability in the context of the attack mitigation framework, particularly focusing on the principle of least privilege and input validation controls. The ATT&CK framework would categorize this as a command execution technique, potentially falling under the T1059.001 sub-technique for command and scripting interpreter. Organizations should implement immediate mitigations including applying the vendor-provided patch if available, restricting local access to the affected service, and monitoring system logs for suspicious command execution patterns. The lack of vendor response to early disclosure attempts creates additional risk as there may be no official patch or mitigation guidance available at this time. System administrators should also consider implementing network segmentation and access controls to limit potential exploitation vectors, while maintaining comprehensive audit logging to detect any unauthorized command execution attempts. This vulnerability highlights the importance of proper input sanitization and the potential consequences of insufficient validation of user-supplied parameters in system services.