Description
An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.
Remediation
References
Related Vulnerabilities
IBM RTC Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2017-1099)
MySQL CVE-2019-2626 Vulnerability (CVE-2019-2626)
PHP Integer Overflow or Wraparound Vulnerability (CVE-2017-9120)
Apache Traffic Server Improper Input Validation Vulnerability (CVE-2022-28129)
Django Uncontrolled Recursion Vulnerability (CVE-2019-14235)