Out-of-Bound Vmalloc Access in imageblit
Summary
GSD-2021-1001605: tty: Fix out-of-bound vmalloc access in imageblit. Affects Kernel versions < 883f7897a25e3ce14a7f274ca4c73f49ac84002a. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's tty subsystem, which is responsible for handling input and output devices, including terminals. The vulnerability allows for out-of-bound vmalloc access in the imageblit function, potentially leading to security breaches and system instability.
Vulnerability Detail
The vulnerability arises from a flaw in the imageblit function within the tty subsystem. It allows an attacker to access memory beyond the allocated buffer, leading to a potential information leak or privilege escalation. By exploiting this vulnerability, an attacker could gain unauthorized access to sensitive data or execute arbitrary code with elevated privileges. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it promptly to mitigate potential risks.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The out-of-bound vmalloc access vulnerability in the imageblit function of the Kernel's tty subsystem poses a potential risk of unauthorized access and privilege escalation. It is crucial to update the Kernel to the fixed version (v5.4.151) to mitigate this vulnerability. Alternatively, users can wait for their Linux distributions to release updated Kernel packages. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability could include unauthorized access to sensitive data, privilege escalation, and potential system instability.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will alert you in real-time if any open-source vulnerabilities, including this one, are detected.
As of now, there is no known exploit for this vulnerability. However, it is essential to address it promptly to prevent any potential exploitation.
The recommended approach to mitigate this vulnerability is to update the Kernel to the fixed version. However, if updating the Kernel is not feasible, implementing additional security measures, such as restricting access to vulnerable components and implementing intrusion detection systems, can help reduce the risk.
For more details about this vulnerability, including technical specifics and the fix, you can refer to the vulnerability's source on the GitHub repository of the Cloud Security Alliance's GSD Database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001605.json).
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