net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets in Kernel
Summary
GSD-2021-1000070: net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets. Affects Kernel versions >= c129412f74e99b609f0a8e95fc3915af1fd40f34, < 8e6dfb7beeb6489ac1365b8a71052e737f5da76e. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and ensures the stability and security of the system. The sch_frag module in the Kernel is responsible for fragmenting IPv4 packets. However, a vulnerability has been discovered in this module that can lead to a stack out-of-bounds read.
Vulnerability Detail
The vulnerability in the sch_frag module of the Kernel allows for a stack out-of-bounds read while fragmenting IPv4 packets. An attacker could exploit this vulnerability to read sensitive information from the stack memory, potentially leading to information disclosure or further exploitation. The vulnerability was introduced in version v5.11 of the Kernel and has been fixed in version v5.12.3.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. Updating to the fixed version of the Kernel is the recommended solution.
Conclusion
The sch_frag module in the Kernel has a vulnerability that allows for a stack out-of-bounds read while fragmenting IPv4 packets. It is crucial to update the Kernel to version v5.12.3 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability allows for a stack out-of-bounds read, which can potentially lead to information disclosure or further exploitation.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
The details regarding remote exploitation are not provided in the vulnerability report. However, it is always recommended to apply security updates promptly to minimize the risk of remote exploitation.
You can refer to the vulnerability report in the GSD database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000070.json) for more detailed information.
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