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I can confirm this issue exists on version 3.1.3, which I have installed elog on Debian 10.
The issue also exists on version 3.14 (1.20190113git283534d97d5a.el7), which I tested on an AmazonLinux EC2 instance.
This is what I found:
1. if I leave out the extension at the end of the URL for a non-existent page, it gives me the red error box. So far so good... Example: /gibberish
2. if I include any random extension at the end of the URL for a non-existent page, it gives me the red error box. So far so good... Example: /gibberish.php or /gibberish.htm or /gibberish.asdfasd
3. if I include any .html extension specifically at the end of the URL for a non-existent page, elog exposes the path /usr/share/elog/themes/default/gibberish.html. This is a bug... Example: /gibberish.html exposes the path, and likewise, /.gibberish.html ( "dot" + gibberish) exposes the path
4. if I include a valid, existent .html file which is located in the directory /usr/share/elog/themes/default/, and call it, elog exposes the html document. Example: I created an html file called gibberish.html (containing <html><body><p>Hello world</p></body></html>) in my system's /usr/share/elog/themes/default/ directory. After navigating back to the /gibberish.html URL, I was presented with the HTML file.
Turning on -v (verbose mode), the response by elogd when accessing these are: "GET /elog/gibberish.html HTTP/1.0 Returned 605 bytes" (displays "Hello world" html file), and "GET /elog/gibberish.asdfasd HTTP/1.0 Returned 605 bytes" (displays red error box).
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My guess: the program seems to be caring about the files ONLY if they have html file extension. Please see the screenshots below.
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What are the security implications? Not much, I think. From what I can tell, exposing the "/usr/share/themes/elog" path, and also exposing the elog version when the file does not exist. Hope this reply helps anyone else with the same question.
(I am sure the error exposing the version can be removed by editing the source code--this is probably beyond my capabilities at this point).
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