CVE-2020-24368
📋 TL;DR
CVE-2020-24368 is a directory traversal vulnerability in Icinga Web2 that allows attackers to read arbitrary files accessible by the Icinga Web2 process. This affects Icinga Web2 versions 2.0.0 through 2.6.4, 2.7.4, and 2.8.2. Organizations running vulnerable versions of Icinga Web2 are at risk of sensitive information disclosure.
💻 Affected Systems
- Icinga Web2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive configuration files, credentials, or system files, potentially leading to full system compromise if privileged credentials are exposed.
Likely Case
Attackers read configuration files containing database credentials, API keys, or other sensitive operational data, enabling further attacks against the monitoring infrastructure.
If Mitigated
With proper file permissions and network segmentation, impact is limited to non-sensitive files accessible only to the Icinga Web2 service account.
🎯 Exploit Status
Directory traversal vulnerabilities are typically easy to exploit with simple HTTP requests containing path traversal sequences.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.6.4, v2.7.4, or v2.8.2
Vendor Advisory: https://icinga.com/2020/08/19/icinga-web-security-release-v2-6-4-v2-7-4-and-v2-8-2/
Restart Required: Yes
Instructions:
1. Backup your current Icinga Web2 configuration. 2. Upgrade to the patched version matching your release track (2.6.x → 2.6.4, 2.7.x → 2.7.4, 2.8.x → 2.8.2). 3. Restart the Icinga Web2 service. 4. Verify the fix by checking the version and testing for the vulnerability.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Icinga Web2 to trusted IP addresses only
# Configure firewall rules to limit access
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
File Permission Hardening
linuxRestrict file permissions for the Icinga Web2 service account
# Limit service account access to necessary directories
chown -R icingaweb2:icingaweb2 /etc/icingaweb2
chmod 750 /etc/icingaweb2
# Remove world-readable permissions from sensitive files
find /etc/icingaweb2 -type f -name '*.conf' -exec chmod 640 {} \;
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Icinga Web2 from untrusted networks
- Apply file system controls to limit the Icinga Web2 service account to only necessary directories
🔍 How to Verify
Check if Vulnerable:
Check the Icinga Web2 version. If it's between 2.0.0-2.6.4, 2.7.4, or 2.8.2 and not the patched versions, it's vulnerable.Check Version:
icingacli version | grep 'Icinga Web'Verify Fix Applied:
After patching, verify the version is 2.6.4, 2.7.4, or 2.8.2 and test with directory traversal attempts that should be blocked.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' or similar path traversal sequences in URLs
- Access to files outside expected Icinga Web2 directories in web server logs
- Failed file access attempts in Icinga Web2 application logs
Network Indicators:
- HTTP requests with encoded directory traversal sequences (%2e%2e%2f, ..%2f)
- Unusual file access patterns from single IP addresses
SIEM Query:
source="web_access.log" AND (url="*..%2f*" OR url="*../*" OR url="*%2e%2e%2f*")🔗 References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00026.html
- https://github.com/Icinga/icingaweb2/blob/master/CHANGELOG.md
- https://github.com/Icinga/icingaweb2/issues/4226
- https://icinga.com/2020/08/19/icinga-web-security-release-v2-6-4-v2-7-4-and-v2-8-2/
- https://lists.debian.org/debian-lts-announce/2020/08/msg00040.html
- https://security.gentoo.org/glsa/202208-05
- https://www.debian.org/security/2020/dsa-4747
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00026.html
- https://github.com/Icinga/icingaweb2/blob/master/CHANGELOG.md
- https://github.com/Icinga/icingaweb2/issues/4226
- https://icinga.com/2020/08/19/icinga-web-security-release-v2-6-4-v2-7-4-and-v2-8-2/
- https://lists.debian.org/debian-lts-announce/2020/08/msg00040.html
- https://security.gentoo.org/glsa/202208-05
- https://www.debian.org/security/2020/dsa-4747
