Samba is an open-source implementation of the Server Message Block (SMB) or Common Internet File System (CIFS) protocol, which allows PC-compatible machines to share files, printers, and other information. The default Samba server configuration enabled both the “wide links” and “unix extensions” options, allowing Samba clients with write access to a share to create symbolic links that point to any location on the file system. Clients connecting with CIFS UNIX extensions disabled could have such links resolved on the server, allowing them to access and possibly overwrite files outside of the share. With this update, “wide links” is set to “no” by default. In addition, the update ensures “wide links” is disabled for shares that have “unix extensions” enabled. Updated packages are available from ftp.redhat.com.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Low: samba security, bug fix, and enhancement update Advisory ID: RHSA-2012:0313-03 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0313.html Issue date: 2012-02-21 CVE Names: CVE-2010-0926 ===================================================================== 1. Summary: Updated samba packages that fix one security issue, one bug, and add one enhancement are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having low security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: RHEL Desktop Workstation (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 3. Description: Samba is an open-source implementation of the Server Message Block (SMB) or Common Internet File System (CIFS) protocol, which allows PC-compatible machines to share files, printers, and other information. The default Samba server configuration enabled both the "wide links" and "unix extensions" options, allowing Samba clients with write access to a share to create symbolic links that point to any location on the file system. Clients connecting with CIFS UNIX extensions disabled could have such links resolved on the server, allowing them to access and possibly overwrite files outside of the share. With this update, "wide links" is set to "no" by default. In addition, the update ensures "wide links" is disabled for shares that have "unix extensions" enabled. (CVE-2010-0926) Warning: This update may cause files and directories that are only linked to Samba shares using symbolic links to become inaccessible to Samba clients. In deployments where support for CIFS UNIX extensions is not needed (such as when files are exported to Microsoft Windows clients), administrators may prefer to set the "unix extensions" option to "no" to allow the use of symbolic links to access files out of the shared directories. All existing symbolic links in a share should be reviewed before re-enabling "wide links". These updated samba packages also fix the following bug: * The smbclient tool sometimes failed to return the proper exit status code. Consequently, using smbclient in a script caused some scripts to fail. With this update, an upstream patch has been applied and smbclient now returns the correct exit status. (BZ#768908) In addition, these updated samba packages provide the following enhancement: * With this update, support for Windows Server 2008 R2 domains has been added. (BZ#736124) Users are advised to upgrade to these updated samba packages, which correct these issues and add this enhancement. After installing this update, the smb service will be restarted automatically. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 562568 - CVE-2010-0926 samba: insecure "wide links" default 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/samba-3.0.33-3.37.el5.src.rpm i386: libsmbclient-3.0.33-3.37.el5.i386.rpm samba-3.0.33-3.37.el5.i386.rpm samba-client-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-swat-3.0.33-3.37.el5.i386.rpm x86_64: libsmbclient-3.0.33-3.37.el5.i386.rpm libsmbclient-3.0.33-3.37.el5.x86_64.rpm samba-3.0.33-3.37.el5.x86_64.rpm samba-client-3.0.33-3.37.el5.x86_64.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.x86_64.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.x86_64.rpm samba-swat-3.0.33-3.37.el5.x86_64.rpm RHEL Desktop Workstation (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/samba-3.0.33-3.37.el5.src.rpm i386: libsmbclient-devel-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm x86_64: libsmbclient-devel-3.0.33-3.37.el5.i386.rpm libsmbclient-devel-3.0.33-3.37.el5.x86_64.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/samba-3.0.33-3.37.el5.src.rpm i386: libsmbclient-3.0.33-3.37.el5.i386.rpm libsmbclient-devel-3.0.33-3.37.el5.i386.rpm samba-3.0.33-3.37.el5.i386.rpm samba-client-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-swat-3.0.33-3.37.el5.i386.rpm ia64: libsmbclient-3.0.33-3.37.el5.ia64.rpm libsmbclient-devel-3.0.33-3.37.el5.ia64.rpm samba-3.0.33-3.37.el5.ia64.rpm samba-client-3.0.33-3.37.el5.ia64.rpm samba-common-3.0.33-3.37.el5.ia64.rpm samba-debuginfo-3.0.33-3.37.el5.ia64.rpm samba-swat-3.0.33-3.37.el5.ia64.rpm ppc: libsmbclient-3.0.33-3.37.el5.ppc.rpm libsmbclient-3.0.33-3.37.el5.ppc64.rpm libsmbclient-devel-3.0.33-3.37.el5.ppc.rpm libsmbclient-devel-3.0.33-3.37.el5.ppc64.rpm samba-3.0.33-3.37.el5.ppc.rpm samba-client-3.0.33-3.37.el5.ppc.rpm samba-common-3.0.33-3.37.el5.ppc.rpm samba-common-3.0.33-3.37.el5.ppc64.rpm samba-debuginfo-3.0.33-3.37.el5.ppc.rpm samba-debuginfo-3.0.33-3.37.el5.ppc64.rpm samba-swat-3.0.33-3.37.el5.ppc.rpm s390x: libsmbclient-3.0.33-3.37.el5.s390.rpm libsmbclient-3.0.33-3.37.el5.s390x.rpm libsmbclient-devel-3.0.33-3.37.el5.s390.rpm libsmbclient-devel-3.0.33-3.37.el5.s390x.rpm samba-3.0.33-3.37.el5.s390x.rpm samba-client-3.0.33-3.37.el5.s390x.rpm samba-common-3.0.33-3.37.el5.s390.rpm samba-common-3.0.33-3.37.el5.s390x.rpm samba-debuginfo-3.0.33-3.37.el5.s390.rpm samba-debuginfo-3.0.33-3.37.el5.s390x.rpm samba-swat-3.0.33-3.37.el5.s390x.rpm x86_64: libsmbclient-3.0.33-3.37.el5.i386.rpm libsmbclient-3.0.33-3.37.el5.x86_64.rpm libsmbclient-devel-3.0.33-3.37.el5.i386.rpm libsmbclient-devel-3.0.33-3.37.el5.x86_64.rpm samba-3.0.33-3.37.el5.x86_64.rpm samba-client-3.0.33-3.37.el5.x86_64.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.x86_64.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.x86_64.rpm samba-swat-3.0.33-3.37.el5.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2010-0926.html https://access.redhat.com/security/updates/classification/#low 8. Contact: The Red Hat security contact is <email@example.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2012 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFPQyCNXlSAg2UNWIIRAlTUAKCk1/N54SxUUnojLGXfDI/tO2LzsQCdGJ/d NMPYOHz4hMzsKcqrPVWO/xg= =gznF -----END PGP SIGNATURE-----