CVE-2025-2312
📋 TL;DR
A vulnerability in cifs-utils allows containerized environments to access the host's Kerberos credentials cache instead of the container's own namespace. This could expose sensitive Kerberos authentication data from the host system. Systems using cifs-utils with Kerberos authentication in containerized environments are affected.
💻 Affected Systems
- cifs-utils
⚠️ 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
Attackers could obtain host Kerberos credentials, potentially leading to lateral movement, privilege escalation, or access to other systems trusting those credentials.
Likely Case
Unauthorized access to host Kerberos tickets, potentially compromising authentication to other services that trust those credentials.
If Mitigated
Limited impact if containers don't use Kerberos authentication or have proper namespace isolation controls.
🎯 Exploit Status
Requires access to container environment and knowledge of container escape techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version containing commit 89b679228cc1be9739d54203d28289b03352c174
Vendor Advisory: https://git.samba.org/?p=cifs-utils.git;a=commit;h=89b679228cc1be9739d54203d28289b03352c174
Restart Required: Yes
Instructions:
1. Update cifs-utils package from your distribution's repository. 2. Restart any containers using cifs-utils. 3. Verify the fix by checking cifs-utils version.
🔧 Temporary Workarounds
Disable Kerberos authentication in containers
linuxPrevent cifs.upcall from attempting Kerberos authentication in containerized environments.
mount -t cifs -o sec=ntlmssp //server/share /mnt
Or use other authentication methods like NTLM
Isolate container namespaces
linuxEnsure containers run with proper namespace isolation to prevent host credential access.
docker run --security-opt=no-new-privileges --cap-drop=ALL image_name
Use container security profiles and namespaces
🧯 If You Can't Patch
- Disable Kerberos authentication for CIFS mounts in containers
- Avoid using cifs-utils in containerized environments where possible
🔍 How to Verify
Check if Vulnerable:
Check cifs-utils version and verify if using Kerberos authentication in containers: rpm -q cifs-utils or dpkg -l cifs-utilsCheck Version:
rpm -q cifs-utils || dpkg -l cifs-utils || cifs.upcall --versionVerify Fix Applied:
Verify cifs-utils version includes the fix commit: cifs.upcall --version or check package changelog📡 Detection & Monitoring
Log Indicators:
- Unexpected Kerberos ticket requests from containers
- cifs.upcall errors related to namespace or credential access
Network Indicators:
- CIFS authentication attempts from containers to Kerberos KDC
SIEM Query:
source="cifs-utils" AND (event="upcall" OR event="kerberos") AND container_id=*