CVE-2022-20103 in MT6580
Summary
by MITRE • 05/04/2022
In aee daemon, there is a possible information disclosure due to symbolic link following. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06383944; Issue ID: ALPS06282684.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-20103 resides within the aee daemon component of Android-based systems, representing a critical information disclosure flaw that stems from improper handling of symbolic links. This daemon serves as a crucial system service responsible for collecting and processing system crash information, making it a prime target for attackers seeking to extract sensitive data from the device. The vulnerability manifests when the daemon follows symbolic links without adequate validation, potentially allowing unauthorized access to files and directories that should remain protected. The flaw specifically impacts systems where the aee daemon operates with system-level execution privileges, creating a significant attack surface that could be exploited by malicious actors with local access to the device. This issue falls under CWE-59, which specifically addresses improper handling of symbolic links, a well-documented weakness in software systems that can lead to various security implications including information disclosure, privilege escalation, and unauthorized access to sensitive resources.
The technical exploitation of this vulnerability occurs through the aee daemon's failure to properly validate symbolic link targets during file processing operations. When the daemon encounters a symbolic link, it follows the link without sufficient checks to ensure that the target path remains within the intended boundaries, potentially allowing attackers to craft malicious symbolic links that point to sensitive system files or directories containing confidential information. The exploitation process requires local system execution privileges, meaning that an attacker must already have access to the device at the system level to leverage this vulnerability effectively. This requirement reduces the attack surface compared to remotely exploitable vulnerabilities but still represents a serious concern for systems where local privilege escalation is possible or where the daemon runs with elevated privileges. The vulnerability's impact is further amplified by the nature of the aee daemon's function, as it typically processes crash reports and system logs that may contain sensitive user data, application information, or system configuration details that could be valuable to adversaries.
The operational impact of CVE-2022-20103 extends beyond simple information disclosure, as the vulnerability could potentially enable more sophisticated attacks when combined with other exploitation techniques. An attacker who successfully exploits this vulnerability could gain access to system crash logs, application memory dumps, or other sensitive data that might contain user credentials, personal information, or proprietary system details. The fact that user interaction is not required for exploitation makes this vulnerability particularly concerning as it can be leveraged automatically without requiring social engineering or other attack vectors. This characteristic aligns with ATT&CK technique T1059, where adversaries may use system services to execute malicious code or extract information. The vulnerability also relates to ATT&CK technique T1005, which involves data from local system repositories, as the exploited daemon would be accessing local storage resources that contain sensitive system information. The patch ID ALPS06383944 and Issue ID ALPS06282684 indicate that this vulnerability was addressed through specific system updates, demonstrating the recognition of the severity by the vendor and the importance of timely patch deployment.
Mitigation strategies for this vulnerability should focus on implementing proper symbolic link validation mechanisms within the aee daemon and similar system services that process file paths. System administrators should ensure that all affected devices receive the vendor-provided patch immediately, as the vulnerability exists at the system daemon level and affects core security functions. Additional protective measures include implementing strict file system permissions and access controls to limit the potential damage from any exploitation attempts. Organizations should also consider monitoring system logs for unusual activity related to the aee daemon or symbolic link operations, as this could indicate attempted exploitation. The remediation process should include comprehensive testing to ensure that the patch does not introduce regressions in system functionality while maintaining the security improvements. Security teams should also conduct regular vulnerability assessments to identify similar issues in other system daemons or services that may be susceptible to the same class of symbolic link handling flaws. The implementation of proper input validation and path resolution techniques should be enforced across all system components that process user or system-generated file paths to prevent similar vulnerabilities from emerging in the future.