CVE-2018-10893
📋 TL;DR
This vulnerability in spice-client allows integer and buffer overflows when processing LZ-compressed frames. A malicious SPICE server could crash the client or potentially execute arbitrary code. Affects systems using SPICE protocol for remote desktop/virtualization access.
💻 Affected Systems
- spice-client
- spice-gtk
- virt-viewer
- Red Hat Enterprise Linux
- Fedora
- CentOS
📦 What is this software?
Spice by Spice Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on client systems, allowing attacker to take full control of affected machines.
Likely Case
Client crashes leading to denial of service for remote desktop/virtualization sessions.
If Mitigated
Limited impact if network segmentation prevents untrusted SPICE servers from connecting to clients.
🎯 Exploit Status
Exploitation requires a malicious SPICE server, which the client must connect to. No public exploit code found in references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: spice-gtk 0.35 and later, specific backported patches for RHEL/CentOS
Vendor Advisory: https://access.redhat.com/errata/RHSA-2019:2229
Restart Required: Yes
Instructions:
1. Update spice-gtk/spice-client packages via package manager. 2. For RHEL/CentOS: yum update spice-gtk spice-client. 3. Restart any SPICE client applications or reboot system.
🔧 Temporary Workarounds
Network segmentation
linuxRestrict SPICE connections to trusted servers only using firewall rules.
iptables -A INPUT -p tcp --dport 5900:5905 -s trusted_server_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 5900:5905 -j DROP
🧯 If You Can't Patch
- Use alternative remote access protocols (VNC, RDP) instead of SPICE where possible
- Implement strict network controls to allow SPICE connections only from trusted, verified servers
🔍 How to Verify
Check if Vulnerable:
Check spice-gtk version: rpm -q spice-gtk or dpkg -l spice-clientCheck Version:
rpm -q --changelog spice-gtk | grep -i CVE-2018-10893Verify Fix Applied:
Verify updated version: spice-gtk >= 0.35 or check for CVE-2018-10893 in changelog📡 Detection & Monitoring
Log Indicators:
- SPICE client crashes
- segmentation faults in spice-client processes
Network Indicators:
- Unusual SPICE traffic patterns from untrusted sources
SIEM Query:
process:spice-client AND (event:crash OR event:segfault)🔗 References
- https://access.redhat.com/errata/RHSA-2019:2229
- https://access.redhat.com/errata/RHSA-2020:0471
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10893
- https://lists.freedesktop.org/archives/spice-devel/2018-July/044489.html
- https://access.redhat.com/errata/RHSA-2019:2229
- https://access.redhat.com/errata/RHSA-2020:0471
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10893
- https://lists.freedesktop.org/archives/spice-devel/2018-July/044489.html
