CVE-2013-7108

What it actually does

Multiple off-by-one errors in process_cgivars allow remote authenticated users to trigger heap-based buffer over-read via long strings in the final key value of CGI variable lists, resulting in sensitive memory disclosure or application crash.

Why it matters to the business

Attackers can extract sensitive process data or disrupt monitoring services, leading to operational downtime and potential loss of visibility into infrastructure health; the vulnerability affects widely deployed monitoring stacks with moderate exploitation likelihood per EPSS.

How an attack unfolds

An authenticated attacker submits a specially crafted HTTP request containing an overly long final key-value pair to any of the listed CGI scripts, causing the off-by-one error during variable list processing and enabling either memory leakage or denial of service.

How to fix it

Upgrade Nagios Core beyond 4.0.2 or Icinga to 1.8.5+, 1.9.4+, or 1.10.2+; for listed Tomcat (Bitnami) instances upgrade to 8.5.64.

How to confirm the fix worked

Confirm installed versions match or exceed the fixed releases; perform regression testing with long CGI variable payloads to verify absence of over-read behavior.

Typical attack path

1. Obtain valid credentials for the monitoring web interface
2. Target one of the vulnerable CGI endpoints in cgi/
3. Append an excessively long string as the final key value in the variable list
4. Trigger process_cgivars to induce buffer over-read and observe results or crash

How to detect it

Inspect web server logs for unusually long strings in requests to the listed CGI scripts; correlate with process crashes or memory-related errors in application logs.

What your security team should do

• Prioritize patching given available public exploits and stable EPSS score
• Restrict authenticated access to CGI endpoints where possible
• Review web access logs for anomalous long parameter values