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Gentoo Linux Security Advisory GLSA 200407-21 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: Samba: Multiple buffer overflows |
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Date: July 29, 2004 |
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Bugs: #57962 |
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ID: 200407-21 |
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Synopsis |
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======== |
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|
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Two buffer overflows vulnerabilities were found in Samba, potentially |
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allowing the remote execution of arbitrary code. |
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Background |
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========== |
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|
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Samba is a package which allows *nix systems to act as file servers for |
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Windows computers. It also allows *nix systems to mount shares exported |
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by a Samba/CIFS/Windows server. The Samba Web Administration Tool |
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(SWAT) is a web-based configuration tool part of the Samba package. |
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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 >= 3.0.5 <= 3.0.4-r1 |
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|
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Description |
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=========== |
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|
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Evgeny Demidov found a buffer overflow in SWAT, located in the base64 |
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data decoder used to handle HTTP basic authentication (CAN-2004-0600). |
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The same flaw is present in the code used to handle the sambaMungedDial |
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attribute value, when using the ldapsam passdb backend. Another buffer |
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overflow was found in the code used to support the 'mangling method = |
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hash' smb.conf option (CAN-2004-0686). Note that the default Samba |
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value for this option is 'mangling method = hash2' which is not |
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vulnerable. |
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|
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Impact |
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====== |
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|
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The SWAT authentication overflow could be exploited to execute |
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arbitrary code with the rights of the Samba daemon process. The |
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overflow in the sambaMungedDial handling code is not thought to be |
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exploitable. The buffer overflow in 'mangling method = hash' code could |
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also be used to execute arbitrary code on vulnerable configurations. |
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|
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Workaround |
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========== |
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|
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Users disabling SWAT, not using ldapsam passdb backends and not using |
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the 'mangling method = hash' option are not vulnerable. |
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Resolution |
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========== |
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All Samba users should upgrade to the latest version: |
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# emerge sync |
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# emerge -pv ">=net-fs/samba-3.0.5" |
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# emerge ">=net-fs/samba-3.0.5" |
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|
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References |
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========== |
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|
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[ 1 ] Samba 3.0.5 Release Notes |
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http://www.samba.org/samba/whatsnew/samba-3.0.5.html |
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[ 2 ] CAN-2004-0600 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0600 |
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[ 3 ] CAN-2004-0686 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686 |
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|
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Availability |
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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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http://security.gentoo.org/glsa/glsa-200407-21.xml |
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Concerns? |
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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 2004 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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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/1.0 |
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