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100 lines
3.7 KiB
100 lines
3.7 KiB
<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
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<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200404-21">
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<title>Multiple Vulnerabilities in Samba</title>
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<synopsis>
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There is a bug in smbfs which may allow local users to gain root via a
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setuid file on a mounted Samba share. Also, there is a tmpfile symlink
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vulnerability in the smbprint script distributed with Samba.
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</synopsis>
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<product type="ebuild">samba</product>
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<announced>April 29, 2004</announced>
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<revised>April 29, 2004: 01</revised>
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<bug>41800</bug>
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<bug>45965</bug>
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<access>local </access>
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<affected>
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<package name="net-fs/samba" auto="yes" arch="*">
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<unaffected range="ge">3.0.2a-r2</unaffected>
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<vulnerable range="le">3.0.2a</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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Samba is a package which allows UNIX systems to act as file servers for
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Windows computers. It also allows UNIX systems to mount shares exported by
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a Samba/CIFS/Windows server. smbmount is a program in the Samba package
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which allows normal users on a UNIX system to mount remote shares. smbprint
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is an example script included in the Samba package which can be used to
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facilitate network printing.
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</p>
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</background>
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<description>
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<p>
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Two vulnerabilities have been discovered in Samba. The first vulnerability
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allows a local user who has access to the smbmount command to gain root. An
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attacker could place a setuid-root binary on a Samba share/server he or she
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controls, and then use the smbmount command to mount the share on the
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target UNIX box. The remote Samba server must support UNIX extensions for
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this to work. This has been fixed in version 3.0.2a.
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</p>
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<p>
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The second vulnerability is in the smbprint script. By creating a symlink
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from /tmp/smbprint.log, an attacker could cause the smbprint script to
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write to an arbitrary file on the system. This has been fixed in version
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3.0.2a-r2.
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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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Local users with access to the smbmount command may gain root access. Also,
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arbitrary files may be overwritten using the smbprint script.
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</p>
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</impact>
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<workaround>
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<p>
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To workaround the setuid bug, remove the setuid bits from the
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/usr/bin/smbmnt, /usr/bin/smbumount and /usr/bin/mount.cifs binaries.
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However, please note that this workaround will prevent ordinary users from
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mounting remote SMB and CIFS shares.
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</p>
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<p>
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To work around the smbprint vulnerability, set "debug=no" in the smbprint
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configuration.
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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 users should update to the latest version of the Samba package.
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</p>
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<p>
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The following commands will perform the upgrade:
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</p>
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<code>
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# emerge sync
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# emerge -pv ">=net-fs/samba-3.0.2a-r2"
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# emerge ">=net-fs/samba-3.0.2a-r2"</code>
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<p>
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Those who are using Samba's password database also need to run the
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following command:
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</p>
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<code>
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# pdbedit --force-initialized-passwords</code>
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<p>
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Those using LDAP for Samba passwords also need to check the sambaPwdLastSet
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attribute on each account, and ensure it is not 0.
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</p>
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</resolution>
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<references>
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<uri link="http://www.securityfocus.com/archive/1/353222/2004-04-09/2004-04-15/1">BugTraq Thread: Samba 3.x + kernel 2.6.x local root vulnerability</uri>
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<uri link="http://seclists.org/lists/bugtraq/2004/Mar/0189.html">BugTraq: smbprint Vulnerability</uri>
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</references>
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<metadata tag="submitter">
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condordes
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</metadata>
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</glsa>
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