64 lines
2.2 KiB
XML
64 lines
2.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
|
|
<glsa id="201612-02">
|
|
<title>DavFS2: Local privilege escalation</title>
|
|
<synopsis>A vulnerability in DavFS2 allows local users to gain root
|
|
privileges.
|
|
</synopsis>
|
|
<product type="ebuild">davfs2</product>
|
|
<announced>2016-12-02</announced>
|
|
<revised count="1">2016-12-02</revised>
|
|
<bug>485232</bug>
|
|
<access>local</access>
|
|
<affected>
|
|
<package name="net-fs/davfs2" auto="yes" arch="*">
|
|
<unaffected range="ge">1.5.2</unaffected>
|
|
<vulnerable range="lt">1.5.2</vulnerable>
|
|
</package>
|
|
</affected>
|
|
<background>
|
|
<p>DavFS2 is a file system driver that allows you to mount a WebDAV server
|
|
as a local disk drive.
|
|
</p>
|
|
</background>
|
|
<description>
|
|
<p>DavFS2 installs “/usr/sbin/mount.davfs” as setuid root. This utility
|
|
uses “system()” to call “/sbin/modprobe”.
|
|
</p>
|
|
|
|
<p>While the call to “modprobe” itself cannot be manipulated, a local
|
|
authenticated user can set the “MODPROBE_OPTIONS” environment
|
|
variable to pass a user controlled path, allowing the loading of an
|
|
arbitrary kernel module.
|
|
</p>
|
|
</description>
|
|
<impact type="normal">
|
|
<p>A local user could gain root privileges.</p>
|
|
</impact>
|
|
<workaround>
|
|
<p>The system administrator should ensure that all modules the
|
|
“mount.davfs” utility tries to load are loaded upon system boot
|
|
before any local user can call the utility.
|
|
</p>
|
|
|
|
<p>An additional defense measure can be implemented by enabling the Linux
|
|
kernel module signing feature. This assists in the prevention of
|
|
arbitrary modules being loaded.
|
|
</p>
|
|
</workaround>
|
|
<resolution>
|
|
<p>All DavFS2 users should upgrade to the latest version:</p>
|
|
|
|
<code>
|
|
# emerge --sync
|
|
# emerge --ask --oneshot --verbose ">=net-fs/davfs2-1.5.2"
|
|
</code>
|
|
</resolution>
|
|
<references>
|
|
<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4362">CVE-2013-4362</uri>
|
|
</references>
|
|
<metadata tag="requester" timestamp="2015-12-07T21:54:18Z">
|
|
BlueKnight
|
|
</metadata>
|
|
<metadata tag="submitter" timestamp="2016-12-02T13:32:55Z">whissi</metadata>
|
|
</glsa>
|