CVE-2025-0395
📋 TL;DR
A buffer overflow vulnerability exists in the GNU C Library's assert() function when assertion failures occur with specific message sizes. This could allow attackers to execute arbitrary code or cause denial of service. Systems using glibc versions 2.13 through 2.40 are affected.
💻 Affected Systems
- GNU C Library (glibc)
⚠️ 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
Remote code execution leading to complete system compromise if combined with other vulnerabilities or in specific application contexts.
Likely Case
Application crash or denial of service when assert() triggers with crafted input.
If Mitigated
Limited impact due to assert() typically being disabled in production builds via NDEBUG flag.
🎯 Exploit Status
Exploitation requires triggering assert() failure with carefully crafted message size that aligns to page boundaries.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.41 or later
Vendor Advisory: https://sourceware.org/git/?p=glibc.git;a=blob;f=advisories/GLIBC-SA-2025-0001
Restart Required: Yes
Instructions:
1. Update glibc to version 2.41 or later using your distribution's package manager. 2. Recompile applications with updated glibc. 3. Restart affected services and applications.
🔧 Temporary Workarounds
Disable assert() in production
linuxCompile applications with NDEBUG flag to disable assert() functionality
gcc -DNDEBUG -o program program.c
Limit assert() usage
allReview and minimize use of assert() in production code
🧯 If You Can't Patch
- Ensure all production builds use NDEBUG flag to disable assert()
- Implement strict input validation to prevent triggering assert() failures
🔍 How to Verify
Check if Vulnerable:
Check glibc version: ldd --version | head -1Check Version:
ldd --version | head -1Verify Fix Applied:
Verify glibc version is 2.41 or later: ldd --version | head -1📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unexpected termination of processes using assert()
Network Indicators:
- Unusual traffic patterns to services using vulnerable glibc
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "assertion failed")🔗 References
- https://sourceware.org/bugzilla/show_bug.cgi?id=32582
- https://sourceware.org/git/?p=glibc.git;a=blob;f=advisories/GLIBC-SA-2025-0001
- https://sourceware.org/pipermail/libc-announce/2025/000044.html
- https://www.openwall.com/lists/oss-security/2025/01/22/4
- http://www.openwall.com/lists/oss-security/2025/01/22/4
- http://www.openwall.com/lists/oss-security/2025/01/23/2
- http://www.openwall.com/lists/oss-security/2025/04/13/1
- http://www.openwall.com/lists/oss-security/2025/04/24/7
- https://lists.debian.org/debian-lts-announce/2025/04/msg00039.html
- https://security.netapp.com/advisory/ntap-20250228-0006/
