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UHTTP Server Path Traversal

UHTTP Server Path Traversal
Posted Mar 23, 2010
Authored by Salvatore Fresta

UHTTP server version 0.1.0-alpha suffers from a path traversal vulnerability that allows for file disclosure.

tags | exploit, file inclusion
SHA-256 | c1050cb7ae93e9d5985ec9474b3e3df4cd8679492ffe9218f6d24eab892ae6bf

UHTTP Server Path Traversal

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uhttp Server Path Traversal Vulnerability

Name uhttp Server
Vendor http://uhttps.sourceforge.net
Versions Affected 0.1.0-alpha

Author Salvatore Fresta aka Drosophila
Website http://www.salvatorefresta.net
Contact salvatorefresta [at] gmail [dot] com
Date 2010-03-10

X. INDEX

I. ABOUT THE APPLICATION
II. DESCRIPTION
III. ANALYSIS
IV. SAMPLE CODE
V. FIX
VI. DISCLOSURE TIMELINE


I. ABOUT THE APPLICATION

An ultra lightweight webserver with a very small memory
usage.


II. DESCRIPTION

Bad chars are not properly sanitised.


III. ANALYSIS

Summary:

A) Path Traversal

A) Path Traversal

The problem is in the management of the bad chars that can
be used to launch some attacks, such as the directory
traversal.
The path traversal sequence ('../') is not checked, so it
can be used for seeking the directories of the affected
system.


IV. SAMPLE CODE

The following is a simple example:

GET /../../../../../../etc/passwd HTTP/1.1

In this example, the daemon has been started in the follows
path: /home/drosophila/downloads/uhttps/src


V. FIX

No patch.


VIII. DISCLOSURE TIMELINE

2010-03-10 Bug discovered
2009-03-10 Advisory Release


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