CVE-2024-21543
📋 TL;DR
This vulnerability in djoser authentication library allows attackers to bypass custom authentication mechanisms like 2FA, LDAP validation, or other configured authentication backends. When the authenticate() function fails, the system falls back to direct database queries, granting access to users with valid credentials. All Django applications using djoser versions before 2.3.0 are affected.
💻 Affected Systems
- djoser
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete authentication bypass allowing unauthorized access to protected resources, potentially leading to data breaches, privilege escalation, and compromise of sensitive systems.
Likely Case
Attackers bypass additional authentication layers like 2FA or LDAP validation, gaining access to user accounts with valid credentials but without meeting all authentication requirements.
If Mitigated
With proper network segmentation and monitoring, impact is limited to authentication bypass for specific accounts, allowing detection and response before significant damage.
🎯 Exploit Status
Exploitation requires valid user credentials but bypasses additional authentication requirements. The vulnerability is well-documented in public sources.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.0
Vendor Advisory: https://github.com/sunscrapers/djoser/releases/tag/2.3.0
Restart Required: Yes
Instructions:
1. Update djoser package: pip install djoser==2.3.0
2. Restart Django application
3. Verify authentication backends function correctly
🔧 Temporary Workarounds
Disable vulnerable authentication flow
allTemporarily modify authentication logic to avoid the vulnerable fallback path
Modify Django settings to use alternative authentication methods
Implement custom authentication middleware
🧯 If You Can't Patch
- Implement additional authentication validation at application layer
- Enable enhanced logging and monitoring for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check djoser version: pip show djoser | grep VersionCheck Version:
pip show djoser | grep VersionVerify Fix Applied:
Verify djoser version is 2.3.0 or higher and test authentication with custom backends📡 Detection & Monitoring
Log Indicators:
- Authentication attempts that bypass custom backends
- Failed authenticate() calls followed by successful logins
- User logins without completing 2FA or other required steps
Network Indicators:
- Unusual authentication patterns
- Multiple login attempts from same user with varying authentication methods
SIEM Query:
source="django" AND (event="authentication_failure" AND event="login_success" within 5s)🔗 References
- https://github.com/sunscrapers/djoser/commit/d33c3993c0c735f23cbedc60fa59fce69354f19d
- https://github.com/sunscrapers/djoser/issues/795
- https://github.com/sunscrapers/djoser/pull/819
- https://github.com/sunscrapers/djoser/releases/tag/2.3.0
- https://security.snyk.io/vuln/SNYK-PYTHON-DJOSER-8366540
- https://lists.debian.org/debian-lts-announce/2025/02/msg00023.html
