CVE-2025-47917
HIGHMbed TLS < 3.6.4 - Use-After-Free in mbedtls_x509_string_to_names()
Title source: llmExploitation Summary
EIP tracks 2 public exploits for CVE-2025-47917. PoCs published by Byte Reaper, byteReaper77.
AI-analyzed exploit summary This exploit leverages a use-after-free vulnerability in Mbed TLS ≤ 3.6.4 to achieve remote code execution by manipulating heap memory and injecting shellcode. It includes ASLR checks and heap spraying techniques to ensure reliability.
Description
Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).
Exploits (2)
This exploit leverages a use-after-free vulnerability in Mbed TLS ≤ 3.6.4 to achieve remote code execution by manipulating heap memory and injecting shellcode. It includes ASLR checks and heap spraying techniques to ensure reliability.
This repository contains a functional exploit for CVE-2025-47917, a Use-After-Free (UAF) vulnerability in mbedTLS 3.6.4's name parsing function. The exploit leverages heap spraying and shellcode injection to achieve arbitrary code execution, demonstrated via a reverse shell.
References (4)
Scores
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H