CVE-2018-20449 : Exploit Details and Defense Strategies
Learn about CVE-2018-20449, a vulnerability in Linux kernel version 4.14.90 allowing local users to access sensitive address information. Find mitigation steps and preventive measures here.
Local users can gain access to sensitive address information by examining "callback=" lines within a debugfs file through the hidma_chan_stats function in drivers/dma/qcom/hidma_dbg.c in Linux kernel version 4.14.90.
Understanding CVE-2018-20449
The hidma_chan_stats function in drivers/dma/qcom/hidma_dbg.c in the Linux kernel 4.14.90 allows local users to obtain sensitive address information by reading "callback=" lines in a debugfs file.
What is CVE-2018-20449?
This CVE refers to a vulnerability in the Linux kernel version 4.14.90 that enables local users to access sensitive address information through specific lines in a debugfs file.
The Impact of CVE-2018-20449
The vulnerability can be exploited by local users to gain unauthorized access to sensitive address information, potentially leading to further security breaches or unauthorized system modifications.
Technical Details of CVE-2018-20449
Vulnerability Description
- Vulnerability Type: Information Disclosure
- Vulnerable Component: hidma_chan_stats function in drivers/dma/qcom/hidma_dbg.c
- Affected Version: Linux kernel version 4.14.90
Affected Systems and Versions
- Affected System: Linux
- Affected Version: 4.14.90
Exploitation Mechanism
The vulnerability can be exploited by local users who have access to the system to read specific lines in the debugfs file, allowing them to retrieve sensitive address information.
Mitigation and Prevention
Immediate Steps to Take
- Monitor access to debugfs files and restrict permissions to prevent unauthorized access.
- Regularly review and audit system logs for any suspicious activities related to address information retrieval.
Long-Term Security Practices
- Implement the principle of least privilege to limit user access to critical system files and directories.
- Conduct regular security training for users to raise awareness about the risks associated with unauthorized data access.
Patching and Updates
- Apply patches provided by the Linux kernel maintainers to address the vulnerability and enhance system security.