SolarWinds Serv-U Directory Traversal and Sensitive File Disclosure Vulnerability (CVE-2024-28995) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSolarWinds Serv-U FTP Server versions 15.4.2 Hotfix 1 and prior
Unauthenticated remote attackers can exploit a directory traversal vulnerability to read sensitive host system and configuration files
Immediately upgrade to SolarWinds Serv-U version 15.4.2 Hotfix 2 or later
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Download the latest secure version (Serv-U 15.4.2 Hotfix 2 or later) from the SolarWinds Customer Portal and apply the update.
Example upgrade commands for Linux environments:
# 1. Stop the existing Serv-U service
sudo systemctl stop Serv-U
# 2. Extract and run the official hotfix installer
tar -zxvf Serv-U-15.4.2-HF2-Linux.tar.gz
sudo ./install.sh
# 3. Restart the service and verify status
sudo systemctl start Serv-U
sudo systemctl status Serv-U2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, deploy Web Application Firewall (WAF) rules or reverse proxy configurations to block directory traversal patterns.
Example Nginx reverse proxy configuration to block traversal attempts:
# Add inside the server block of your Nginx configuration
server {
listen 80;
server_name serv-u.example.com;
location / {
# Block requests containing directory traversal sequences
if ($request_uri ~* '(\.\./|\.\.\\)') {
return 403 'Access Denied: Invalid Path Traversal Attempt';
}
proxy_pass http://127.0.0.1:8080;
}
}3. Log Audit & IoC Verification Commands
Inspect the Serv-U HTTP/HTTPS access logs to identify potential exploitation attempts targeting system files.
Example command to search for suspicious traversal patterns in Linux logs:
# Search for directory traversal sequences and system file access in Serv-U logs
grep -Ei '(\.\./|\.\.\\|win\.ini|etc/passwd)' /usr/local/Serv-U/Users/Interface/*.logBlock Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-28995) is a high-severity directory traversal (CWE-22) flaw in the SolarWinds Serv-U file transfer server. The root cause lies in insufficient input validation and path canonicalization of user-supplied input in HTTP/HTTPS requests, allowing attackers to bypass the web root directory and access arbitrary files on the host operating system.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated remote attacker (CVSS PR:N) can exploit this vulnerability by sending specially crafted HTTP/HTTPS requests containing directory traversal sequences (such as '../' or encoded equivalents). This allows the attacker to read sensitive files (e.g., 'win.ini' on Windows or '/etc/passwd' on Linux) within the context of the privileges under which the Serv-U process runs. This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog.
3. Infrastructure & Business Impact
Successful exploitation of this vulnerability can lead to the exposure of highly sensitive information, including database credentials, configuration files, and proprietary business data. This exposure can serve as a stepping stone for lateral movement, credential harvesting, and full infrastructure compromise.
Official Vendor Advisories & References
SolarWinds Serv-U was susceptible to a directory transversal vulnerability that would allow access to read sensitive files on the host machine.
Frequently Asked SecOps Questions (CVE-2024-28995)
FAQQ1. How critical is CVE-2024-28995 and is it actively exploited in the wild?
CVE-2024-28995 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 99.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-28995?
Primary impacted vendors include solarwinds across serv-u. Scope summary: SolarWinds Serv-U 15.4.2 Hotfix 1 and all prior versions (applicable to both Windows and Linux deployments)
Q3. What temporary mitigations or workarounds exist for CVE-2024-28995 before patching?
[Mitigation] Immediately upgrade to SolarWinds Serv-U version 15.4.2 Hotfix 2 or later Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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