Red Hat Security Advisory: OpenShift Container Platform 4.21.18 bug fix and security update

Important

A flaw was found in minimatch. A remote attacker could exploit this Regular Expression Denial of Service (ReDoS) vulnerability by providing a specially crafted glob pattern. This pattern, containing numerous consecutive wildcard characters, causes excessive processing and exponential backtracking in the regular expression engine. Successful exploitation leads to a Denial of Service (DoS), making the application unresponsive.

CWE-1333 - Inefficient Regular Expression Complexity

A flaw was found in gRPC-Go, the Go language implementation of gRPC. This vulnerability, an authorization bypass, is caused by improper input validation of the HTTP/2 `:path` pseudo-header. A remote attacker can exploit this by sending raw HTTP/2 frames with a malformed `:path` that omits the mandatory leading slash. This allows the attacker to bypass defined security policies, potentially leading to unauthorized access to services or information disclosure.

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization