netfilter: nftables: Avoid Overflows in nft_hash_buckets()
Summary
GSD-2021-1000207: netfilter: nftables: avoid overflows in nft_hash_buckets(). Affects Kernel versions >= 0ed6389c483dc77cdbdd48de0ca7ce41723dd667, < a388d10961ff8578b1a6691945d406c0f33aa71b. 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. It provides a framework for various firewalling functionalities. nftables is a subsystem within netfilter that allows users to define and manage firewall rules. The nft_hash_buckets() function is a critical component of nftables that handles the allocation of memory for hash tables used in firewall rule lookups.
Vulnerability Detail
The vulnerability identified as GSD-2021-1000207 in the netfilter package affects the nftables subsystem. It arises from a lack of proper bounds checking in the nft_hash_buckets() function. This vulnerability can lead to buffer overflows, potentially resulting in arbitrary code execution or denial of service attacks. An attacker could exploit this vulnerability by crafting malicious packets or firewall rules to trigger the overflow. The vulnerability was introduced in version v4.9 of the Linux Kernel and has been fixed in version v5.12.5.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch manually to their existing kernel version. The patch can be obtained from the commit a388d10961ff8578b1a6691945d406c0f33aa71b in the Linux Kernel repository. Users can review the patch and apply it to their kernel source code following the provided instructions.
Conclusion
The netfilter package, specifically the nftables subsystem, is vulnerable to a buffer overflow issue in the nft_hash_buckets() function. This vulnerability can have severe consequences, including arbitrary code execution or denial of service attacks. It is crucial to update the Linux Kernel to version v5.12.5 or later to mitigate this vulnerability. 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 firewalling functionalities, including packet filtering and network address translation (NAT).
nftables is a subsystem within netfilter that allows users to define and manage firewall rules in the Linux operating system.
The nft_hash_buckets() function is a critical component of nftables that handles the allocation of memory for hash tables used in firewall rule lookups.
This vulnerability can lead to buffer overflows, which may result in arbitrary code execution or denial of service attacks.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.12.5 or later.
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