CVE-2025-0662
📋 TL;DR
CVE-2025-0662 is a kernel memory leak vulnerability in FreeBSD's ktrace facility that allows unprivileged userspace programs to read up to 14 bytes of uninitialized kernel heap memory. This affects FreeBSD systems where ktrace is enabled, potentially exposing sensitive kernel data. The vulnerability requires local access to exploit.
💻 Affected Systems
- FreeBSD
⚠️ 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
An attacker could leak kernel pointers or sensitive data that could aid in bypassing kernel address space layout randomization (KASLR) or facilitate other kernel exploits.
Likely Case
Limited information disclosure of kernel memory contents, potentially revealing kernel pointers or other sensitive data that could be used in conjunction with other vulnerabilities.
If Mitigated
Minimal impact if ktrace is disabled or systems are patched, as the leak is small and requires local access.
🎯 Exploit Status
Exploitation requires local access and knowledge of how to trigger the specific ktrace functionality. The advisory provides technical details but no public exploit code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FreeBSD 14.1-RELEASE-p1, 14.2-RELEASE-p1, 15.0-RELEASE-p1, 15.1-RELEASE-p1
Vendor Advisory: https://security.freebsd.org/advisories/FreeBSD-SA-25:04.ktrace.asc
Restart Required: Yes
Instructions:
1. Update system using freebsd-update fetch && freebsd-update install
2. Rebuild kernel if using custom kernel
3. Reboot system to load patched kernel
🔧 Temporary Workarounds
Disable ktrace for unprivileged users
allRestrict ktrace access to privileged users only to prevent exploitation
sysctl security.bsd.unprivileged_proc_debug=0
🧯 If You Can't Patch
- Restrict ktrace access to privileged users only via sysctl security.bsd.unprivileged_proc_debug=0
- Monitor for unusual ktrace usage and restrict user access to systems where patching isn't immediately possible
🔍 How to Verify
Check if Vulnerable:
Check FreeBSD version with 'uname -a' and compare against affected versions. Check if ktrace is accessible to unprivileged users.Check Version:
uname -aVerify Fix Applied:
Verify system is running patched version with 'uname -a' showing -p1 suffix. Check that sysctl security.bsd.unprivileged_proc_debug is set appropriately.📡 Detection & Monitoring
Log Indicators:
- Unusual ktrace usage by unprivileged users
- Failed attempts to access ktrace functionality
Network Indicators:
- None - local exploit only
SIEM Query:
process.name:ktrace AND user.privileges:false