Earlier this week, Apache HTTP Server users have been urged to immediately patch as a zero-day bug in the open-source cross-platform web server software is actively being exploited in the wild.
Apache Software Foundation released version 2.4.50 in order to address CVE-2021-41773, a path traversal and file disclosure flaw in the previous version (2.4.49).
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root
If files outside of the document root are not protected by “require all denied” these requests can succeed. Additionally, this flaw could leak the source of interpreted files like CGI scripts.
Apache Issues a New Patch
Yesterday, the organization issued the HTTP Web Server 2.4.51 version as the previous fix didn’t work as expected, being incomplete.
The Apache HTTP Server is a free and open-source cross-platform web server software, developed and maintained by an open community of developers under the guidance of the Apache Software Foundation.
Most of the open-source HTTP Server instances run on a Linux distribution but current versions also run on Microsoft Windows, OpenVMS, and a wide variety of Unix-like