[UNIX] DZip Directory Traversal

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DZip Directory Traversal
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SUMMARY

<http://speeddemosarchive.com/dzip/news.html> Dzip is a program for file
compression. It's advantage over more popular compression software is in
the size of the program, easily fitting on a floppy disk.

Dzip is vulnerable to a directory traversal attack when unpacking
specially crafted .dz files.

DETAILS

Vulnerable Systems:
* dzip version 2.9 and prior.

Proof of Concept:
1. Get the <http://bugs.gentoo.org/attachment.cgi?id=59225> PoC.dz file
2. Extract, like here:
bash-2.05b$ ./dzip -x PoC.dz
PoC.dz created using v2.9
extracting ./../../exploited_file
3. 2 directories up, you can find a file called exploit_file with a
"w0000t" string in it.

ADDITIONAL INFORMATION

The information has been provided by Stefan Cornelius.
The original article can be found at:
<http://bugs.gentoo.org/show_bug.cgi?id=93079>
http://bugs.gentoo.org/show_bug.cgi?id=93079

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