AOH :: HP Unsorted K :: BU-1867.HTM

Kojoney (SSH honeypot) remote DoS



Kojoney (SSH honeypot) remote DoS
Kojoney (SSH honeypot) remote DoS




[=] Affected software : 

        Name : Kojoney
	Description : Low interaction SSH honeypot
	Version : < 0.0.4.2
        Service : TCP/22

[=] Patched version : 

http://sourceforge.net/projects/kojoney/files/kojoney-0.0.4.2.tar.gz/download 

[=] Technical details : 

Emulation of the wget and curl commands is made via calls to
urllib.urlopen(url). The only sanity check is the following :

	if url.find("://") == -1:
url = "http://" + url 

This will catch some attempts to access local files like
"file:/etc/hosts" but requesting "file://localhost/foo/bar" is still
possible.

Under Linux, this can be used to access "file://localhost/dev/urandom".
The kojoney.py process will then use 100% of CPU and will grow in
memory, until killed by the kernel OOM Killer.

[=] Note :

When exploiting urlopen() related vulnerabilities in Python
applications, some little known features can come handy :

data://,HelloWorld
=> returned value is "HelloWorld"

data:text;base64,WDVPIVAlQEFQWzRcUFpYNTQoUF4pN0NDKTd9JEVJQ0FSLVNUQU5EQVJELUFOVElWSVJVUy1URVNULUZJTEUhJEgrSCo=://a
=> returned value is the EICAR test string

And yes, these strings too bypass the "://" Kojoney check ;-)

Nicob 


The entire AOH site is optimized to look best in Firefox® 3 on a widescreen monitor (1440x900 or better).
Site design & layout copyright © 1986-2014 AOH
We do not send spam. If you have received spam bearing an artofhacking.com email address, please forward it with full headers to abuse@artofhacking.com.