The default configuration of smbd in Samba before 3.3.11, 3.4.x before 3.4.6, and 3.5.x before 3.5.0rc3, when a writable share exists, allows remote authenticated users to leverage a directory traversal vulnerability, and access arbitrary files, by using the symlink command in smbclient to create a symlink containing .. (dot dot) sequences, related to the combination of the unix extensions and wide links options.
https://bugzilla.samba.org/show_bug.cgi?id=7104
https://bugzilla.redhat.com/show_bug.cgi?id=562568
http://www.samba.org/samba/news/symlink_attack.html
http://www.openwall.com/lists/oss-security/2010/03/05/3
http://www.openwall.com/lists/oss-security/2010/02/06/3
http://secunia.com/advisories/39317
http://marc.info/?l=samba-technical&m=126555346721629&w=2
http://marc.info/?l=samba-technical&m=126549111204428&w=2
http://marc.info/?l=samba-technical&m=126548356728379&w=2
http://marc.info/?l=samba-technical&m=126547903723628&w=2
http://marc.info/?l=samba-technical&m=126540695819735&w=2
http://marc.info/?l=samba-technical&m=126540608318301&w=2
http://marc.info/?l=samba-technical&m=126540539117328&w=2
http://marc.info/?l=samba-technical&m=126540477016522&w=2
http://marc.info/?l=samba-technical&m=126540475116511&w=2
http://marc.info/?l=samba-technical&m=126540376915283&w=2
http://marc.info/?l=samba-technical&m=126540290614053&w=2
http://marc.info/?l=samba-technical&m=126540277713815&w=2
http://marc.info/?l=samba-technical&m=126540248613395&w=2
http://marc.info/?l=samba-technical&m=126540100511357&w=2
http://marc.info/?l=samba-technical&m=126540011609753&w=2
http://marc.info/?l=samba-technical&m=126539387432412&w=2
http://marc.info/?l=oss-security&m=126777580624790&w=2
http://marc.info/?l=oss-security&m=126545363428745&w=2
http://marc.info/?l=oss-security&m=126540733320471&w=2
http://marc.info/?l=oss-security&m=126540402215620&w=2
http://marc.info/?l=oss-security&m=126539592603079&w=2
http://marc.info/?l=full-disclosure&m=126538598820903&w=2
http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2010-04/msg00001.html
http://gitweb.samba.org/?p=samba.git%3Ba=commit%3Bh=bd269443e311d96ef495a9db47d1b95eb83bb8f4
http://blog.metasploit.com/2010/02/exploiting-samba-symlink-traversal.html
http://archives.neohapsis.com/archives/fulldisclosure/2010-02/0108.html
http://archives.neohapsis.com/archives/fulldisclosure/2010-02/0107.html
http://archives.neohapsis.com/archives/fulldisclosure/2010-02/0083.html