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Gentoo Linux Security Advisory GLSA 200711-29 |
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http://security.gentoo.org/ |
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|
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Severity: High |
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Title: Samba: Execution of arbitrary code |
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Date: November 20, 2007 |
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Bugs: #197519 |
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ID: 200711-29 |
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|
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Synopsis |
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======== |
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|
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Samba contains two buffer overflow vulnerabilities potentially |
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resulting in the execution of arbitrary code, one of which is currently |
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unfixed. |
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|
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Background |
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========== |
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|
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Samba is a suite of SMB and CIFS client/server programs for UNIX. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-fs/samba < 3.0.26a-r2 >= 3.0.26a-r2 |
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|
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Description |
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=========== |
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|
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Two vulnerabilities have been reported in nmbd. Alin Rad Pop (Secunia |
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Research) discovered a boundary checking error in the |
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reply_netbios_packet() function which could lead to a stack-based |
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buffer overflow (CVE-2007-5398). The Samba developers discovered a |
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boundary error when processing GETDC logon requests also leading to a |
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buffer overflow (CVE-2007-4572). |
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|
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Impact |
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====== |
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|
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To exploit the first vulnerability a remote unauthenticated attacker |
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could send specially crafted WINS "Name Registration" requests followed |
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by a WINS "Name Query" request. This might lead to execution of |
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arbitrary code with elevated privileges. Note that this vulnerability |
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is exploitable only when WINS server support is enabled in Samba. The |
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second vulnerability could be exploited by sending specially crafted |
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"GETDC" mailslot requests, but requires Samba to be configured as a |
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Primary or Backup Domain Controller. It is not believed the be |
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exploitable to execute arbitrary code. |
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|
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Workaround |
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========== |
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|
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To work around the first vulnerability, disable WINS support in Samba |
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by setting "wins support = no" in the "global" section of your smb.conf |
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and restart Samba. |
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|
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Resolution |
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========== |
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|
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The Samba 3.0.27 ebuild that resolves both vulnerabilities is currently |
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masked due to a regression in the patch for the second vulnerability. |
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|
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Since no working patch exists yet, all Samba users should upgrade to |
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3.0.26a-r2, which contains a fix for the first vulnerability |
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(CVE-2007-5398): |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-fs/samba-3.0.26a-r2" |
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|
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An update to this temporary GLSA will be sent when the second |
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vulnerability will be fixed. |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2007-4572 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4572 |
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[ 2 ] CVE-2007-5398 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5398 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200711-29.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2007 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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