CVE-2025-7424
📋 TL;DR
A type confusion vulnerability in libxslt's psvi memory field allows attackers to crash applications or corrupt memory during XML transformations. This affects any software using vulnerable libxslt versions for XML processing. The most likely impact is denial of service, but memory corruption could potentially lead to more severe consequences.
💻 Affected Systems
- libxslt
- Applications using libxslt for XML transformations
📦 What is this software?
Libxslt by Xmlsoft
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution or complete system compromise
Likely Case
Application crash causing denial of service
If Mitigated
Limited impact with proper input validation and sandboxing
🎯 Exploit Status
Exploitation requires attacker to control XML/XSLT input to vulnerable application
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libxslt 1.1.39 or later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-7424
Restart Required: Yes
Instructions:
1. Check current libxslt version
2. Update to libxslt 1.1.39+ via package manager
3. Restart affected services
4. Recompile applications if statically linked
🔧 Temporary Workarounds
Disable XSLT processing
allDisable XML transformation features in applications
Configure applications to reject XSLT processing
Input validation
allValidate and sanitize all XML/XSLT input
Implement strict XML schema validation
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems
- Deploy WAF with XML/XSLT filtering rules
🔍 How to Verify
Check if Vulnerable:
Check libxslt version: xsltproc --versionCheck Version:
xsltproc --version | head -1Verify Fix Applied:
Verify version is 1.1.39 or higher: xsltproc --version | grep -q '1\.1\.3[9-9]\|1\.1\.[4-9]'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in system logs
- Unexpected process termination
Network Indicators:
- Unusual XML/XSLT payloads to services
- Repeated connection attempts with XML data
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption" OR "libxslt")🔗 References
- https://access.redhat.com/security/cve/CVE-2025-7424
- https://bugzilla.redhat.com/show_bug.cgi?id=2379228
- http://seclists.org/fulldisclosure/2025/Aug/0
- http://seclists.org/fulldisclosure/2025/Jul/30
- http://seclists.org/fulldisclosure/2025/Jul/32
- http://seclists.org/fulldisclosure/2025/Jul/33
- http://seclists.org/fulldisclosure/2025/Jul/35
- http://seclists.org/fulldisclosure/2025/Jul/37
- http://www.openwall.com/lists/oss-security/2025/07/11/2
- https://lists.debian.org/debian-lts-announce/2025/09/msg00024.html
