netfilter: nftables: Avoid Overflows in nft_hash_buckets()
Summary
GSD-2021-1000411: netfilter: nftables: avoid overflows in nft_hash_buckets(). Affects Kernel versions >= 0ed6389c483dc77cdbdd48de0ca7ce41723dd667, < c77e2ef18167ad334e27610ced9a7f6af5ec1787. No fix is published. How to fix ↓
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Background
The netfilter package is a part of the Linux Kernel ecosystem and is responsible for implementing packet filtering and network address translation (NAT) in the Linux operating system. nftables is a subsystem within netfilter that provides a new packet filtering framework. It allows users to define rules and actions for packet processing. The nft_hash_buckets() function is a critical component of nftables that calculates the number of hash buckets for a given hash table.
Vulnerability Detail
The vulnerability identified as GSD-2021-1000411 in the netfilter package affects the nft_hash_buckets() function. It can lead to overflows, potentially resulting in memory corruption or denial of service (DoS) attacks. The vulnerability was introduced in version v4.9 of the Linux Kernel and fixed in version v5.4.120. An attacker could exploit this vulnerability to manipulate hash table structures and cause unexpected behavior or crashes in the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a possible workaround is to limit the exposure of the vulnerable code by restricting access to the affected functionality. This can be achieved through proper network configuration and access control policies. However, applying the fix by updating the Kernel is the recommended approach.
Conclusion
The netfilter package, specifically the nftables subsystem, is vulnerable to an overflow issue in the nft_hash_buckets() function. This vulnerability can result in memory corruption or denial of service attacks. It is crucial to update the Linux Kernel to version v5.4.120 or later to mitigate this vulnerability. If immediate updating is not possible, restricting access to the affected functionality can serve as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The netfilter package is a component of the Linux Kernel that provides packet filtering and network address translation (NAT) capabilities.
nftables is a subsystem within netfilter that offers a new packet filtering framework, allowing users to define rules and actions for packet processing.
The nft_hash_buckets() function is a critical component of nftables that calculates the number of hash buckets for a given hash table.
This vulnerability can lead to memory corruption or denial of service (DoS) attacks. Exploiting the vulnerability could result in unexpected behavior or crashes in the system.
To fix this vulnerability, update the Linux Kernel to version v5.4.120 or later, which includes the necessary fix for the nft_hash_buckets() function.
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