Slab-out-of-bounds Vulnerability in Kernel
Summary
GSD-2021-1001239: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions. Affects Kernel versions >= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74, < ce8fafb68051fba52546f8bbe8621f7641683680. No fix is published. How to fix ↓
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Background
The Kernel is a crucial 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 IPv6 module, specifically the 'fib6_nh_flush_exceptions' function. This function is responsible for flushing exceptions in the IPv6 forwarding information base (FIB) nexthop cache. The vulnerability allows for a slab-out-of-bounds condition, which can potentially be exploited by an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition.
Vulnerability Detail
The slab-out-of-bounds vulnerability in the 'fib6_nh_flush_exceptions' function of the Kernel's IPv6 module can lead to memory corruption and subsequent security issues. By exploiting this vulnerability, an attacker may be able to execute arbitrary code with elevated privileges or trigger a DoS condition. The vulnerability was introduced in version v5.3 of the Linux Kernel and was fixed in version v5.10.54. The specific commit that addresses this issue is ce8fafb68051fba52546f8bbe8621f7641683680. It is important to note that the impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can consider disabling IPv6 functionality if it is not required in their specific use case. This can be achieved by modifying the system's network configuration files to prevent the loading of the IPv6 module. However, it is important to note that this workaround may not be feasible or desirable in all scenarios, especially in environments where IPv6 is necessary for proper network communication.
Conclusion
The slab-out-of-bounds vulnerability in the Kernel's IPv6 module poses a potential security risk, allowing for memory corruption and potential code execution or DoS attacks. It is crucial to update the Linux Kernel to version v5.10.54 or later to mitigate this vulnerability. Alternatively, users can consider disabling IPv6 functionality if it is not required. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially allow an attacker to execute arbitrary code with elevated privileges or cause a denial-of-service condition.
You can check the version of the Linux Kernel installed on your system. If it is a version between v5.3 and v5.10.53 (inclusive), your system may be vulnerable.
There are no known instances of this vulnerability being exploited in the wild at the time of this report.
Yes, the vulnerability has been fixed in version v5.10.54 of the Linux Kernel. It is recommended to update to this version or a later one.
While updating the Kernel is the recommended approach, you can consider disabling IPv6 functionality as a temporary workaround if it is not essential for your system.
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