1. Introduction
The Sambar Server Multiple Script XSS vulnerability affects web servers hosting vulnerable CGIs. This allows an attacker to inject malicious scripts into webpages viewed by users, potentially stealing their cookies and compromising accounts. Systems running the affected Sambar web server software are at risk. Impact is likely to be high on confidentiality due to cookie theft, medium on integrity if pages are defaced, and low on availability as denial of service is not a direct outcome.
2. Technical Explanation
- Root cause: Missing input validation in Sambar CGIs allows unsanitised data to be rendered in webpages.
- Exploit mechanism: An attacker crafts a URL with a malicious JavaScript payload embedded within a vulnerable CGI parameter. When a user visits the crafted URL, the script executes in their browser. For example, an attacker could use 3. Detection and Assessment
Confirming vulnerability requires checking for the presence of vulnerable CGIs on the system. A thorough method involves reviewing CGI scripts for input validation flaws.
- Quick checks: Check for the existence of CGI directories using
ls -l /cgi-binor equivalent depending on your operating system. - Scanning: Nessus plugin ID 34871 may detect this vulnerability, but results should be verified manually.
- Logs and evidence: Web server access logs may show requests to vulnerable CGIs with suspicious parameters. Look for patterns like
- Quick checks: Check for the existence of CGI directories using