CVE-2023-49794 is an authentication bypass vulnerability identified in KernelSU, a kernel-based root management solution for Android devices, specifically affecting versions 0.7.1 and earlier. KernelSU operates by granting root privileges to applications that it recognizes as legitimate, using a kernel module to verify the APK path and package name. The vulnerability arises from flawed logic in the 'get apk path' function within the KernelSU kernel module, which can be bypassed by a malicious APK named exactly 'me.weishu.kernelsu'—the same package name as the official KernelSU Manager app. This spoofing allows the malicious APK to be mistakenly granted root permissions without proper verification. Consequently, an attacker who can install such a malicious APK on a device with KernelSU installed can escalate privileges to root, gaining full control over the device's operating system and data. The vulnerability requires local access (AV:L) with low privileges (PR:L) and user interaction (UI:R) to install the malicious APK. The attack complexity is high (AC:H) due to the need to bypass certain protections and install an APK with the specific package name. The vulnerability impacts confidentiality, integrity, and availability (all rated high), as root access enables an attacker to manipulate system files, intercept data, and disrupt device operations. As of the publication date, no patch or fix is available, increasing the risk for affected devices. No known exploits are reported in the wild yet, but the potential for abuse remains significant given the nature of root access on Android devices.

For European organizations, this vulnerability poses a significant risk primarily to employees or users who utilize Android devices with KernelSU installed, particularly in environments where devices are rooted for development, testing, or specialized applications. Root access compromises device security entirely, allowing attackers to bypass security controls, access sensitive corporate data, implant persistent malware, and potentially pivot into corporate networks. The risk is heightened in sectors with strict data protection requirements such as finance, healthcare, and government, where device compromise could lead to data breaches and regulatory penalties under GDPR. Additionally, organizations relying on mobile device management (MDM) solutions that permit or do not restrict rooted devices may face increased exposure. The vulnerability's requirement for user interaction (installing a malicious APK) means social engineering or phishing campaigns could be leveraged to exploit it. The absence of a patch means organizations must rely on detection and mitigation strategies until an official fix is released.

1. Immediate mitigation should focus on preventing installation of unauthorized APKs, especially those mimicking the package name 'me.weishu.kernelsu'. This can be enforced via strict application whitelisting and mobile device management policies that block sideloading or installation from untrusted sources. 2. Educate users about the risks of installing apps from unknown sources and the specific danger of apps impersonating trusted system components. 3. Monitor devices for the presence of suspicious APKs with the vulnerable package name and unusual privilege escalations. 4. Employ runtime detection tools capable of identifying unauthorized root access or kernel module manipulations. 5. Where possible, avoid using KernelSU or rooted devices in sensitive environments until a patched version is available. 6. Coordinate with device vendors and KernelSU maintainers to track patch releases and apply updates promptly once available. 7. Implement network segmentation and limit device access to critical corporate resources to reduce lateral movement risk if a device is compromised.