CVE-2024-2243
📋 TL;DR
CVE-2024-2243 is an OS command injection vulnerability in csmock that allows authenticated users with Kerberos tickets to execute arbitrary commands on OSH workers and steal the Snyk authentication token. This affects systems running vulnerable versions of csmock with OSH service enabled. Attackers can gain unauthorized access and potentially compromise the entire OSH infrastructure.
💻 Affected Systems
- csmock
📦 What is this software?
Csmock by Csutils
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of OSH workers leading to lateral movement, data exfiltration, and complete system takeover across the OSH infrastructure.
Likely Case
Unauthorized command execution leading to Snyk token theft and limited system access on affected workers.
If Mitigated
Limited impact if proper network segmentation and least privilege access controls are implemented.
🎯 Exploit Status
Exploitation requires valid Kerberos authentication but command injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: csmock 0.10.0 and later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2024-2243
Restart Required: Yes
Instructions:
1. Update csmock to version 0.10.0 or later using your package manager. 2. Restart OSH service and workers. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable OSH Service
linuxTemporarily disable the OSH service if patching is not immediately possible.
systemctl stop osh-service
systemctl disable osh-service
Restrict Kerberos Access
linuxLimit which users can obtain Kerberos tickets for OSH service access.
Modify Kerberos principal ACLs to restrict access
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OSH workers from sensitive systems
- Apply strict least privilege principles and monitor all user activities with Kerberos tickets
🔍 How to Verify
Check if Vulnerable:
Check csmock version: rpm -q csmock or dpkg -l csmockCheck Version:
csmock --versionVerify Fix Applied:
Verify version is 0.10.0 or higher and test OSH service functionality📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in OSH worker logs
- Failed authentication attempts to OSH service
- Unexpected Snyk API calls
Network Indicators:
- Unusual outbound connections from OSH workers
- Snyk API calls from unexpected sources
SIEM Query:
source="osh-worker.log" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")🔗 References
- https://access.redhat.com/security/cve/CVE-2024-2243
- https://bugzilla.redhat.com/show_bug.cgi?id=2267336
- https://access.redhat.com/security/cve/CVE-2024-2243
- https://bugzilla.redhat.com/show_bug.cgi?id=2267336
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5MJC7U2ZKXUZWELQUJSN56WL5IM4MDR/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TIBNRL3LTG747DNWTBCPRSNRPKOBANMX/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X3HF6YTEGGW3SWB4V7JUVIRCXIBRHR7A/
