List Archive: gentoo-commits
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file : http://sources.gentoo.org/viewcvs.py/gentoo/xml/htdocs/security/en/glsa/glsa-200711-29.xml?rev=1.1&view=markup
<?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">
<title>Samba: Execution of arbitrary code</title>
Samba contains two buffer overflow vulnerabilities potentially resulting in
the execution of arbitrary code, one of which is currently unfixed.
<announced>November 20, 2007</announced>
<revised>November 20, 2007: 01</revised>
<package name="net-fs/samba" auto="yes" arch="*">
Samba is a suite of SMB and CIFS client/server programs for UNIX.
Two vulnerabilities have been reported in nmbd. Alin Rad Pop (Secunia
Research) discovered a boundary checking error in the
reply_netbios_packet() function which could lead to a stack-based
buffer overflow (CVE-2007-5398). The Samba developers discovered a
boundary error when processing GETDC logon requests also leading to a
buffer overflow (CVE-2007-4572).
To exploit the first vulnerability a remote unauthenticated attacker
could send specially crafted WINS "Name Registration" requests followed
by a WINS "Name Query" request. This might lead to execution of
arbitrary code with elevated privileges. Note that this vulnerability
is exploitable only when WINS server support is enabled in Samba. The
second vulnerability could be exploited by sending specially crafted
"GETDC" mailslot requests, but requires Samba to be configured as a
Primary or Backup Domain Controller. It is not believed the be
exploitable to execute arbitrary code.
To work around the first vulnerability, disable WINS support in Samba
by setting "<i>wins support = no</i>" in the "global" section of your
smb.conf and restart Samba.
The Samba 3.0.27 ebuild that resolves both vulnerabilities is currently
masked due to a regression in the patch for the second vulnerability.
Since no working patch exists yet, all Samba users should upgrade to
3.0.26a-r2, which contains a fix for the first vulnerability
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-fs/samba-3.0.26a-r2"</code>
An update to this temporary GLSA will be sent when the second
vulnerability will be fixed.
<metadata tag="submitter" timestamp="Sat, 03 Nov 2007 23:37:14 +0000">
<metadata tag="bugReady" timestamp="Tue, 20 Nov 2007 21:13:02 +0000">
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