CVE-2022-30522 - Denial of Service (DoS) Vulnerability in Apache httpd "mod_sed" filter
This past March we posted an analysis of a vulnerability in the Apache HTTP Server mod_sed filter module, CVE-2022-23943, in which a Denial of Service (DoS) can be triggered due to a miscalculation of buffers’ sizes. While analyzing this Apache httpd vulnerability and its patch, we suspected that although the fix resolved the issue, it created a new unwanted behavior. Our suspicion turned out to be true: we discovered that another way to cause a DoS was introduced.