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CVE-2023-52440 is a Linux kernel ksmbd vulnerability in ksmbd_decode_ntlmssp_auth_blob(). According to the provided content, if authblob->SessionKey.Length is larger than the fixed session key size (CIFS_KEY_SIZE), the key exchange code can copy attacker-controlled SessionKey data into the session key array without proper bounds enforcement, causing a SLUB-based heap overflow. The issue occurs during NTLMSSP authentication blob processing in the in-kernel SMB server (ksmbd).
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (POC) exploit for two Linux kernel KSMBD vulnerabilities (CVE-2023-52440 and CVE-2023-4130), enabling remote code execution (RCE) via a 0-click attack. The exploit targets the KSMBD kernel module on Linux 6.1.45 (and likely other vulnerable versions), requiring a custom kernel configuration and a patched impacket library (patch provided as impacket.diff). The build-image.sh script automates the creation of a vulnerable Debian-based VM image with KSMBD and a test user/share. The main exploit logic is in poc.py, which uses the patched impacket library to interact with the SMB server, leak heap memory, and craft a payload that hijacks control flow to execute a reverse shell (nc.traditional -e /bin/sh) as root. The exploit is complex, involving heap spraying, memory leaks, and vtable hijacking, and is intended for research purposes only. The repository is well-structured, with clear separation between the environment setup, library patching, and exploit logic.
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Referenced as the CVE that CVE-2023-4533 was duplicated to; no further vulnerability details are provided in the content.
A specific Linux kernel vulnerability referenced in the discussion; exact flaw type is unclear from the provided text.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.