CVE-2020-13584
📋 TL;DR
This CVE describes a use-after-free vulnerability in WebKitGTK that allows remote code execution when a user visits a malicious website. The vulnerability affects WebKitGTK browser version 2.30.1 on x64 systems. Attackers can exploit this to execute arbitrary code on the victim's system.
💻 Affected Systems
- WebKitGTK
📦 What is this software?
Fedora by Fedoraproject
Webkitgtk by Webkitgtk
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, data theft, and lateral movement within the network.
Likely Case
Remote code execution leading to malware installation, credential theft, and system compromise of individual workstations.
If Mitigated
Limited impact with proper browser sandboxing and security controls, potentially containing the exploit to the browser process.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious site) but no authentication. Use-after-free vulnerabilities typically require specific memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WebKitGTK 2.30.2 or later
Vendor Advisory: https://security.gentoo.org/glsa/202012-10
Restart Required: Yes
Instructions:
1. Update WebKitGTK to version 2.30.2 or later using your distribution's package manager. 2. Restart all applications using WebKitGTK. 3. For Fedora: 'sudo dnf update webkit2gtk3'. 4. For Gentoo: Follow GLSA 202012-10 instructions.
🔧 Temporary Workarounds
Disable JavaScript
allDisable JavaScript in WebKitGTK-based browsers to prevent exploitation
Browser-specific: Check browser settings for JavaScript toggle
Use alternative browser
linuxTemporarily use browsers not based on WebKitGTK
🧯 If You Can't Patch
- Implement network filtering to block access to untrusted websites
- Use application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check WebKitGTK version: 'webkit2gtk3 --version' or check package managerCheck Version:
webkit2gtk3 --version || rpm -q webkit2gtk3 || emerge -pv webkit-gtkVerify Fix Applied:
Verify version is 2.30.2 or later: 'webkit2gtk3 --version | grep -q "2.30.[2-9]\|2.3[1-9]" && echo "Patched"'📡 Detection & Monitoring
Log Indicators:
- Browser crash logs with memory access violations
- Unexpected process spawns from browser processes
Network Indicators:
- Connections to known malicious domains from browser processes
- Unusual outbound traffic patterns
SIEM Query:
process_name:"webkit" AND (event_type:"crash" OR parent_process:"browser")🔗 References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY2OBQZFMEFZOSWXPXHPEHOJXXILEEX2/
- https://security.gentoo.org/glsa/202012-10
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1195
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY2OBQZFMEFZOSWXPXHPEHOJXXILEEX2/
- https://security.gentoo.org/glsa/202012-10
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1195
