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+<?xml version="1.0" encoding="utf-8"?>
+<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
+<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
+<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
+
+<glsa id="200504-06">
+ <title>sharutils: Insecure temporary file creation</title>
+ <synopsis>
+ The unshar utility is vulnerable to symlink attacks, potentially allowing a
+ local user to overwrite arbitrary files.
+ </synopsis>
+ <product type="ebuild">sharutils</product>
+ <announced>April 06, 2005</announced>
+ <revised>April 06, 2005: 01</revised>
+ <bug>87939</bug>
+ <access>local</access>
+ <affected>
+ <package name="app-arch/sharutils" auto="yes" arch="*">
+ <unaffected range="ge">4.2.1-r11</unaffected>
+ <vulnerable range="lt">4.2.1-r11</vulnerable>
+ </package>
+ </affected>
+ <background>
+ <p>
+ sharutils is a collection of tools to deal with shar archives.
+ </p>
+ </background>
+ <description>
+ <p>
+ Joey Hess has discovered that the program unshar, which is a part
+ of sharutils, creates temporary files in a world-writable directory
+ with predictable names.
+ </p>
+ </description>
+ <impact type="normal">
+ <p>
+ A local attacker could create symbolic links in the temporary
+ files directory, pointing to a valid file somewhere on the filesystem.
+ When unshar is executed, this would result in the file being
+ overwritten with the rights of the user running the utility, which
+ could be the root user.
+ </p>
+ </impact>
+ <workaround>
+ <p>
+ There is no known workaround at this time.
+ </p>
+ </workaround>
+ <resolution>
+ <p>
+ All sharutils users should upgrade to the latest version:
+ </p>
+ <code>
+ # emerge --sync
+ # emerge --ask --oneshot --verbose &quot;&gt;=app-arch/sharutils-4.2.1-r11&quot;</code>
+ </resolution>
+ <references>
+ <uri link="http://www.ubuntulinux.org/support/documentation/usn/usn-104-1">Ubuntu Advisory</uri>
+ </references>
+ <metadata tag="requester" timestamp="Tue, 5 Apr 2005 07:42:03 +0000">
+ koon
+ </metadata>
+ <metadata tag="submitter" timestamp="Tue, 5 Apr 2005 13:07:06 +0000">
+ lewk
+ </metadata>
+ <metadata tag="bugReady" timestamp="Wed, 6 Apr 2005 20:15:09 +0000">
+ lewk
+ </metadata>
+</glsa>