Vulnerability in Kernel package: s390/decompressor buffer overflow
Summary
GSD-2023-1002319: s390/decompressor: specify __decompress() buf len to avoid overflow. Affects Kernel versions < f1eb22d0ff064ad458b3b1a1eaa84ac3996206c2. No fix is published. How to fix ↓
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Background
The Kernel package is an essential component of the Linux operating system, responsible for managing the system's core functionality. It provides the necessary interfaces for communication between hardware and software components. The s390/decompressor module within the Kernel package is responsible for decompressing compressed kernel images during the boot process on IBM System z mainframes. This vulnerability in the s390/decompressor module allows for a buffer overflow, potentially leading to arbitrary code execution or a denial of service (DoS) attack.
Vulnerability Detail
The vulnerability in the s390/decompressor module arises from the lack of specifying the buffer length in the __decompress() function. This omission can result in an overflow of the buffer, allowing an attacker to overwrite adjacent memory regions or execute arbitrary code. The impact of this vulnerability can range from crashing the system to gaining unauthorized access or escalating privileges. It is important to note that the actual attack plausibility and impact have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the use of the s390/decompressor module if it is not essential for their system's boot process. This can be achieved by modifying the kernel configuration to exclude the module. However, it is recommended to apply the official fix by updating the Kernel package as soon as possible.
Conclusion
In conclusion, the Kernel package's s390/decompressor module is vulnerable to a buffer overflow, which can have severe consequences such as system crashes, unauthorized access, or arbitrary code execution. It is crucial to update the Kernel package to the fixed version or apply the temporary workaround to mitigate the risk. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel package is a critical component of the Linux operating system, responsible for managing core system functionality and facilitating communication between hardware and software components.
The s390/decompressor module is a part of the Kernel package specifically designed for decompressing compressed kernel images during the boot process on IBM System z mainframes.
A buffer overflow vulnerability occurs when a program writes data beyond the boundaries of a buffer, potentially overwriting adjacent memory regions. This can lead to crashes, unauthorized access, or the execution of arbitrary code.
The impacts of this vulnerability can range from crashing the system to gaining unauthorized access or escalating privileges. However, the actual attack plausibility and impact have not been proven yet.
To fix this vulnerability, it is recommended to update the Linux Kernel package to version v6.1.13 or later, which includes the necessary fix. Updating the Kernel package ensures that the __decompress() function specifies the buffer length correctly, mitigating the risk of buffer overflow.
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