Listen to this Post
How the mentioned CVE works:
The vulnerability is a heap-based buffer overflow in the `nftnl-rs` Rust crate, a wrapper for the libnftnl C library. The flaw is triggered when the `nftnl::Batch::with_page_size` constructor is called with a small or malformed `page_size` value. This value is passed directly to the underlying C function nftnl_batch_alloc, which uses it to calculate a buffer size. If `page_size` is zero or very small, the calculation results in an insufficient memory allocation. Subsequent operations, such as initializing the batch, will then write data beyond the allocated buffer’s boundaries, corrupting the heap and potentially leading to arbitrary code execution.
Platform: Linux
Version: nftnl-rs < 0.2.2
Vulnerability: Heap Overflow
Severity: Critical
date: 2024-11-25
Prediction: Patch 2024-12-16
What Undercode Say:
cargo audit
let batch = Batch::with_page_size(0); // Triggers overflow
gdb --args ./target/debug/my_nftnl_app
How Exploit:
Exploitation involves an attacker providing a maliciously small page size to the `with_page_size` function. This causes an undersized heap buffer allocation. By carefully controlling the subsequent data written into the batch, an attacker can overflow the buffer, overwriting adjacent heap metadata and data structures. This corruption can be leveraged to achieve remote code execution or cause a denial-of-service by crashing the application.
Protection from this CVE:
Update nftnl-rs to version 0.2.2.
Implement input validation for page_size.
Use memory sanitizers during testing.
Impact:
Arbitrary Code Execution
Denial of Service
Privilege Escalation
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
