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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200405-19">
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<title>Opera telnet URI handler file creation/truncation vulnerability</title>
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<synopsis>
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A vulnerability exists in Opera's telnet URI handler that may allow a
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remote attacker to overwrite arbitrary files.
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</synopsis>
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<product type="ebuild">opera</product>
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<announced>2004-05-25</announced>
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<revised count="03">2007-12-30</revised>
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<bug>50857</bug>
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<access>remote</access>
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<affected>
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<package name="www-client/opera" auto="yes" arch="*">
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<unaffected range="ge">7.50_beta1</unaffected>
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<vulnerable range="lt">7.50_beta1</vulnerable>
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</package>
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</affected>
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<background>
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<p>
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Opera is a multi-platform web browser.
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</p>
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</background>
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<description>
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<p>
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The telnet URI handler in Opera does not check for leading '-'
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characters in the host name. Consequently, a maliciously-crafted
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telnet:// link may be able to pass options to the telnet program
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itself. One example would be the following:
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</p>
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<p>
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telnet://-nMyFile
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</p>
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<p>
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If MyFile exists in the user's home directory and the user clicking on
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the link has write permissions to it, the contents of the file will be
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overwritten with the output of the telnet trace information. If MyFile
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does not exist, the file will be created in the user's home directory.
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</p>
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</description>
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<impact type="normal">
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<p>
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This exploit has two possible impacts. First, it may create new files
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in the user's home directory. Second, and far more serious, it may
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overwrite existing files that the user has write permissions to. An
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attacker with some knowledge of a user's home directory might be able
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to destroy important files stored within.
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</p>
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</impact>
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<workaround>
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<p>
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Disable the telnet URI handler from within Opera.
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</p>
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</workaround>
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<resolution>
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<p>
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All Opera users are encouraged to upgrade to the latest version of the
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program:
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</p>
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<code>
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# emerge sync
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# emerge -pv ">=www-client/opera-7.50_beta1"
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# emerge ">=www-client/opera-7.50_beta1"</code>
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</resolution>
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<references>
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<uri link="http://www.idefense.com/application/poi/display?id=104&type=vulnerabilities&flashstatus=true">iDEFENSE Security Advisory 05.12.04</uri>
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<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0473">CVE-2004-0473</uri>
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</references>
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<metadata tag="submitter">
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klieber
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</metadata>
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</glsa>
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