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Finding Apache HTTP Server instances

(updated ), by Pearce Barry
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Update: The 2.4.50 fix was incomplete and we strongly recommend upgrading to 2.4.51 or newer.

The Apache Software Foundation recently announced a path traversal vulnerability present in version 2.4.49 of the Apache HTTP Server software. Due to insufficient coverage of potential path traversal characters in the URL, an unauthenticated attacker can read files outside of the document root and even execute system commands in some configurations. While this vulnerability (CVE-2021-41773) only affects version 2.4.49 (and 2.4.50 as a variant), it was exploited in the wild to Apache publishing their security advisory.

How to find Apache HTTP Server with Rumble #

From the Service Inventory, use the following pre-built query to locate vulnerable Apache HTTP Server instances in your network:

product:"apache httpd" AND protocol:http AND (http.head.server:"Apache/2.4.49" OR http.head.server:"Apache/2.4.50")
Find vulnerable Apache HTTP Servers

As always, any prebuilt queries we create are available from our Queries Library. Check out the library for other useful inventory queries.

Try Rumble #

Don’t have Rumble and need help finding your Apache HTTP Server instances? Start your Rumble trial today.

Pearce Barry
Written by Pearce Barry

Pearce Barry is a Director of Security Research at runZero. Barry joined runZero in June 2021, working on the Metasploit Project the four years prior. Now, Pearce leads research efforts at runZero, which includes creating and improving fingerprints, adding to protocols, enhancing scanning logic, and writing queries.

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