This is an update that fixes a problem with handling embedded newlines in share names or mountpoints.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2011:1221 advisory.

    Samba is a suite of programs used by machines to share files, printers, and     other information. The cifs-utils package contains utilities for mounting     and managing CIFS (Common Internet File System) shares.

    A cross-site scripting (XSS) flaw was found in the password change page of     the Samba Web Administration Tool (SWAT). If a remote attacker could trick     a user, who was logged into the SWAT interface, into visiting a     specially-crafted URL, it would lead to arbitrary web script execution in     the context of the user's SWAT session. (CVE-2011-2694)

    It was found that SWAT web pages did not protect against Cross-Site     Request Forgery (CSRF) attacks. If a remote attacker could trick a user,     who was logged into the SWAT interface, into visiting a specially-crafted     URL, the attacker could perform Samba configuration changes with the     privileges of the logged in user. (CVE-2011-2522)

    It was found that the fix for CVE-2010-0547, provided in the cifs-utils     package included in the GA release of Red Hat Enterprise Linux 6, was     incomplete. The mount.cifs tool did not properly handle share or directory     names containing a newline character, allowing a local attacker to corrupt     the mtab (mounted file systems table) file via a specially-crafted CIFS     share mount request, if mount.cifs had the setuid bit set. (CVE-2011-2724)

    It was found that the mount.cifs tool did not handle certain errors     correctly when updating the mtab file. If mount.cifs had the setuid bit     set, a local attacker could corrupt the mtab file by setting a small file     size limit before running mount.cifs. (CVE-2011-1678)

    Note: mount.cifs from the cifs-utils package distributed by Red Hat does     not have the setuid bit set. We recommend that administrators do not     manually set the setuid bit for mount.cifs.

    Red Hat would like to thank the Samba project for reporting CVE-2011-2694     and CVE-2011-2522, and Dan Rosenberg for reporting CVE-2011-1678. Upstream     acknowledges Nobuhiro Tsuji of NTT DATA Security Corporation as the     original reporter of CVE-2011-2694, and Yoshihiro Ishikawa of LAC Co., Ltd.
    as the original reporter of CVE-2011-2522.

    This update also fixes the following bug:

    * If plain text passwords were used (encrypt passwords = no in     /etc/samba/smb.conf), Samba clients running the Windows XP or Windows     Server 2003 operating system may not have been able to access Samba shares     after installing the Microsoft Security Bulletin MS11-043. This update     corrects this issue, allowing such clients to use plain text passwords to     access Samba shares. (BZ#728517)

    Users of samba and cifs-utils are advised to upgrade to these updated     packages, which contain backported patches to resolve these issues. After     installing this update, the smb service will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated samba3x packages that fix multiple security issues are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Samba is a suite of programs used by machines to share files, printers, and other information.

A cross-site scripting (XSS) flaw was found in the password change page of the Samba Web Administration Tool (SWAT). If a remote attacker could trick a user, who was logged into the SWAT interface, into visiting a specially crafted URL, it would lead to arbitrary web script execution in the context of the user's SWAT session.
(CVE-2011-2694)

It was found that SWAT web pages did not protect against Cross-Site Request Forgery (CSRF) attacks. If a remote attacker could trick a user, who was logged into the SWAT interface, into visiting a specially crafted URL, the attacker could perform Samba configuration changes with the privileges of the logged in user. (CVE-2011-2522)

It was found that the fix for CVE-2010-0547, provided by the Samba rebase in RHBA-2011:0054, was incomplete. The mount.cifs tool did not properly handle share or directory names containing a newline character, allowing a local attacker to corrupt the mtab (mounted file systems table) file via a specially crafted CIFS (Common Internet File System) share mount request, if mount.cifs had the setuid bit set.
(CVE-2011-2724)

It was found that the mount.cifs tool did not handle certain errors correctly when updating the mtab file. If mount.cifs had the setuid bit set, a local attacker could corrupt the mtab file by setting a small file size limit before running mount.cifs. (CVE-2011-1678)

Note: mount.cifs from the samba3x packages distributed by Red Hat does not have the setuid bit set. We recommend that administrators do not manually set the setuid bit for mount.cifs.

Red Hat would like to thank the Samba project for reporting CVE-2011-2694 and CVE-2011-2522, and Dan Rosenberg for reporting CVE-2011-1678. Upstream acknowledges Nobuhiro Tsuji of NTT DATA Security Corporation as the original reporter of CVE-2011-2694, and Yoshihiro Ishikawa of LAC Co., Ltd. as the original reporter of CVE-2011-2522.

Users of Samba are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. After installing this update, the smb service will be restarted automatically.

Samba is a suite of programs used by machines to share files, printers, and other information.

A cross-site scripting (XSS) flaw was found in the password change page of the Samba Web Administration Tool (SWAT). If a remote attacker could trick a user, who was logged into the SWAT interface, into visiting a specially crafted URL, it would lead to arbitrary web script execution in the context of the user's SWAT session.
(CVE-2011-2694)

It was found that SWAT web pages did not protect against Cross-Site Request Forgery (CSRF) attacks. If a remote attacker could trick a user, who was logged into the SWAT interface, into visiting a specially crafted URL, the attacker could perform Samba configuration changes with the privileges of the logged in user. (CVE-2011-2522)

It was found that the fix for CVE-2010-0547 was incomplete. The mount.cifs tool did not properly handle share or directory names containing a newline character, allowing a local attacker to corrupt the mtab (mounted file systems table) file via a specially crafted CIFS (Common Internet File System) share mount request, if mount.cifs had the setuid bit set. (CVE-2011-2724)

It was found that the mount.cifs tool did not handle certain errors correctly when updating the mtab file. If mount.cifs had the setuid bit set, a local attacker could corrupt the mtab file by setting a small file size limit before running mount.cifs. (CVE-2011-1678)

Note: mount.cifs from the samba3x packages distributed by Scientific Linux does not have the setuid bit set. We recommend that administrators do not manually set the setuid bit for mount.cifs.

Users of Samba are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. After installing this update, the smb service will be restarted automatically.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The check_mtab function in client/mount.cifs.c in mount.cifs in smbfs in Samba 3.5.10 and earlier does not     properly verify that the (1) device name and (2) mountpoint strings are composed of valid characters,     which allows local users to cause a denial of service (mtab corruption) via a crafted string. NOTE: this     vulnerability exists because of an incorrect fix for CVE-2010-0547. (CVE-2011-2724)

Note that Nessus relies on the presence of the package as reported by the vendor.

Dan Rosenberg discovered that cifs-utils incorrectly handled changes to the mtab file. A local attacker could use this issue to corrupt the mtab file, possibly leading to a denial of service. (CVE-2011-1678)

Jan Lieskovsky discovered that cifs-utils incorrectly filtered certain strings being added to the mtab file. A local attacker could use this issue to corrupt the mtab file, possibly leading to a denial of service. (CVE-2011-2724).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple vulnerabilities has been discovered and corrected in samba/cifs-utils :

smbfs in Samba 3.5.8 and earlier attempts to use (1) mount.cifs to append to the /etc/mtab file and (2) umount.cifs to append to the /etc/mtab.tmp file without first checking whether resource limits would interfere, which allows local users to trigger corruption of the /etc/mtab file via a process with a small RLIMIT_FSIZE value, a related issue to CVE-2011-1089 (CVE-2011-1678).

The check_mtab function in client/mount.cifs.c in mount.cifs in smbfs in Samba 3.5.10 and earlier does not properly verify that the (1) device name and (2) mountpoint strings are composed of valid characters, which allows local users to cause a denial of service (mtab corruption) via a crafted string. NOTE: this vulnerability exists because of an incorrect fix for CVE-2010-0547 (CVE-2011-2724).

Additionally for Mandriva Linux 2010.2 the cifs-utils package has been upgraded to the 4.8.1 version that brings numerous additional fixes.

Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149 products_id=490

The updated packages have been patched to correct these issues.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
55944	Fedora 16 : cifs-utils-5.0-2.fc16 (2011-10028)	Nessus	Fedora Local Security Checks	2011/8/23	2021/1/11	low
56001	RHEL 6 : samba and cifs-utils (RHSA-2011:1221)	Nessus	Red Hat Local Security Checks	2011/8/30	2025/4/14	medium
56000	RHEL 5 : samba3x (RHSA-2011:1220)	Nessus	Red Hat Local Security Checks	2011/8/30	2021/1/14	medium
56272	CentOS 5 : samba3x (CESA-2011:1220)	Nessus	CentOS Local Security Checks	2011/9/23	2021/1/4	medium
61121	Scientific Linux Security Update : samba3x on SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	2012/8/1	2021/1/14	medium
55778	Fedora 15 : cifs-utils-5.0-2.fc15 (2011-9831)	Nessus	Fedora Local Security Checks	2011/8/9	2021/1/11	low
55780	Fedora 14 : cifs-utils-4.8.1-7.fc14 (2011-9847)	Nessus	Fedora Local Security Checks	2011/8/9	2021/1/11	low
217563	Linux Distros Unpatched Vulnerability : CVE-2011-2724	Nessus	Misc.	2025/3/3	2026/1/28	critical
56390	Ubuntu 10.10 / 11.04 : cifs-utils vulnerabilities (USN-1226-2)	Nessus	Ubuntu Local Security Checks	2011/10/5	2019/9/19	low
56462	Mandriva Linux Security Advisory : samba (MDVSA-2011:148)	Nessus	Mandriva Local Security Checks	2011/10/12	2021/1/6	low

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