CVE-2023-52168

What it actually does

Heap-based buffer overflow in the NTFS handler allows an attacker to overwrite two bytes at multiple offsets beyond the allocated buffer (buffer+512*i-2 for i>=9), potentially corrupting adjacent heap structures and enabling arbitrary code execution or denial of service during archive extraction.

Why it matters to the business

Organizations relying on 7-Zip for file decompression face risk of system compromise or service disruption when processing untrusted archives, with elevated urgency for high-volume extraction workflows or automated pipelines that handle external files.

How an attack unfolds

An attacker crafts a specially malformed NTFS-structured archive that triggers the overflow in NtfsHandler.cpp when opened or extracted by a vulnerable 7-Zip version; the limited two-byte overwrites at predictable offsets can be chained to corrupt heap metadata and achieve code execution without user interaction beyond opening the file.

How to fix it

Upgrade 7-Zip to version 24.01 or later on all systems; replace any embedded or bundled instances of the vulnerable 7zz binary; disable automatic extraction of untrusted archives until patched.

How to confirm the fix worked

Verify installed 7-Zip version is 24.01 or higher; test extraction of known-malformed NTFS test archives in a sandbox to confirm absence of overflow behavior; review package managers and build pipelines for pinned older versions.

Typical attack path

1. Create a malicious archive exploiting the NTFS handler overflow
2. Deliver the archive via email, download, or shared storage
3. Victim or automated process opens or extracts the archive with 7-Zip
4. Overflow corrupts heap memory leading to code execution or crash

How to detect it

Monitor process creation and file access logs for 7-Zip binaries handling archives from untrusted sources; inspect crash dumps or heap corruption indicators in 7zz or 7z processes; correlate with file creation timestamps of suspicious archives.

What your security team should do

• Prioritize immediate upgrade to 7-Zip 24.01 across endpoints and servers
• Inventory all instances of 7-Zip including command-line 7zz binaries
• Block or sandbox processing of untrusted archives until remediation complete
• Update detection rules to flag older 7-Zip versions in software inventory