[UNIX] Security Vulnerability in SpeechD
From: support@securiteam.comDate: 09/20/01
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From: support@securiteam.com To: list@securiteam.com Subject: [UNIX] Security Vulnerability in SpeechD Message-Id: <20010920190449.41149138C1@mail.der-keiler.de> Date: Thu, 20 Sep 2001 21:04:49 +0200 (CEST)
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Security Vulnerability in SpeechD
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SUMMARY
<http://www.speechio.org/speechd.html> SpeechD is a daemon that hooks
itself to the /dev/speech device, monitoring it for incoming text, and
whenever such text is detected the program will read it using a voice
synthesizer. Inadequate escaping of the ' character allows local attackers
to execute arbitrary commands with the daemon's permissions.
DETAILS
Vulnerable systems:
SpeechD version 0.54
Immune systems:
SpeechD version 0.55
A vulnerability in SpeechD allows attackers to run arbitrary code as the
root user or whoever is running SpeechD.
Exploit:
Executing the following command will cause the product to create a file
named /etc/evilfile with the settings of rwxs (setuid the user executing
SpeechD):
echo "';touch /tmp/evilfile;chmod a+rwxs /tmp/evilfile" >/dev/speech
ADDITIONAL INFORMATION
The information has been provided by <mailto:tspivey8@home.com> Tyler
Spivey.
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