CVE-2023-20928: Binder VMA management security issues in :linux_kernel:
Summary
CVE-2023-20928: In binder_vma_close of binder.c, there is a possible use after free due to improper locking. Affects :linux_kernel: versions >= :0, < :2023-01-05. Fixed in :2023-01-05. How to fix ↓
Also tracked for
- linux · Debian:11
The same CVE-2023-20928 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
The :linux_kernel: package is a crucial component of the Android ecosystem, responsible for managing the core functionality of the operating system. It provides the necessary infrastructure for communication between processes through the Binder mechanism. The Binder Virtual Memory Area (VMA) management is a critical aspect of this package, ensuring the proper allocation and deallocation of memory resources for inter-process communication. However, a security vulnerability has been identified in the binder_vma_close function of binder.c, which can lead to a use-after-free scenario due to improper locking. This vulnerability allows for local escalation of privilege without requiring any additional execution privileges. Exploitation of this vulnerability does not necessitate user interaction.
Vulnerability Detail
The vulnerability in the binder_vma_close function arises from improper locking, leading to a use-after-free scenario. This can be exploited by an attacker to escalate their privileges locally, without the need for additional execution privileges. The use-after-free vulnerability occurs when a program frees a memory object and later attempts to access it. In this case, the improper locking allows an attacker to manipulate the freed memory object, potentially leading to arbitrary code execution or other malicious activities. The impact of this vulnerability is significant, as it can enable an attacker to gain elevated privileges on the affected system.
How To Fix
Minimum fixed version
:2023-01-05
This is the first release that contains the fix.
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Workaround
At present, there is no known workaround for this vulnerability. It is recommended to apply the official fix provided by the Android source repository to address the issue effectively.
Conclusion
In conclusion, the :linux_kernel: package in the Android ecosystem is vulnerable to a security issue in the binder_vma_close function, which can lead to local privilege escalation. It is crucial to apply the provided fix from the official Android source repository to mitigate the risk of exploitation. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability allows for local escalation of privilege, enabling an attacker to gain elevated privileges on the affected system.
No, user interaction is not needed for the exploitation of this vulnerability.
No, there is currently no known workaround for this vulnerability. Applying the official fix is the recommended course of action.
The fix for this vulnerability can be obtained from the official Android source repository at https://android.googlesource.com/kernel/common/+/201d5f4a3ec1.
This vulnerability is rated as high severity due to its potential for local privilege escalation.
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