CVE-2023-24545
📋 TL;DR
This vulnerability in Arista CloudEOS allows attackers to cause denial of service by sending malformed packets that leak packet buffers. If enough malformed packets are received, the switch may eventually stop forwarding traffic. Only Arista CloudEOS platforms are affected.
💻 Affected Systems
- Arista CloudEOS
📦 What is this software?
Cloudeos by Arista
Cloudeos by Arista
Cloudeos by Arista
Cloudeos by Arista
⚠️ Risk & Real-World Impact
Worst Case
Complete network outage where the switch stops forwarding all traffic, disrupting all network communications through the affected device.
Likely Case
Degraded network performance and potential service disruption as packet buffers are exhausted, leading to packet loss and connectivity issues.
If Mitigated
Minimal impact with proper network segmentation, rate limiting, and monitoring in place to detect and block malformed packets.
🎯 Exploit Status
Exploitation requires sending specially crafted malformed packets to the vulnerable switch.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Arista advisory for specific fixed versions
Vendor Advisory: https://www.arista.com/en/support/advisories-notices/security-advisory/17240-security-advisory-0085
Restart Required: Yes
Instructions:
1. Review Arista security advisory 0085. 2. Download and install the patched version of CloudEOS. 3. Reboot the switch to apply the patch. 4. Verify the patch is applied correctly.
🔧 Temporary Workarounds
Network segmentation and filtering
allImplement network segmentation and filtering to limit exposure to untrusted networks
Rate limiting
allConfigure rate limiting on ingress interfaces to limit potential packet flood
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable switches from untrusted networks
- Deploy network monitoring and intrusion detection systems to detect malformed packet attacks
🔍 How to Verify
Check if Vulnerable:
Check current CloudEOS version and compare against Arista's advisory for vulnerable versionsCheck Version:
show version | include CloudEOSVerify Fix Applied:
Verify the installed CloudEOS version matches or exceeds the patched version specified in the advisory📡 Detection & Monitoring
Log Indicators:
- Increased packet buffer allocation failures
- Unusual packet drop rates
- Sfe process errors or crashes
Network Indicators:
- Unusual malformed packet traffic to switch management interfaces
- Sudden increase in packet buffer usage
SIEM Query:
source="switch_logs" AND ("packet buffer" OR "Sfe" OR "malformed")