The MS-RPC functionality in smbd in Samba 3.0.0 through 3.0.25rc3 allows remote attackers to execute arbitrary commands via shell metacharacters involving the (1) SamrChangePassword function, when the "username map script" smb.conf option is enabled, and allows remote authenticated users to execute commands via shell metacharacters involving other MS-RPC functions in the (2) remote printer and (3) file share management.

The remote NewStart CGSL host, running version MAIN 6.02, has samba packages installed that are affected by multiple vulnerabilities:

  - Multiple heap-based buffer overflows in the NDR parsing in smbd in Samba 3.0.0 through 3.0.25rc3 allow     remote attackers to execute arbitrary code via crafted MS-RPC requests involving (1) DFSEnum     (netdfs_io_dfs_EnumInfo_d), (2) RFNPCNEX (smb_io_notify_option_type_data), (3) LsarAddPrivilegesToAccount     (lsa_io_privilege_set), (4) NetSetFileSecurity (sec_io_acl), or (5) LsarLookupSids/LsarLookupSids2     (lsa_io_trans_names). (CVE-2007-2446)

  - The MS-RPC functionality in smbd in Samba 3.0.0 through 3.0.25rc3 allows remote attackers to execute     arbitrary commands via shell metacharacters involving the (1) SamrChangePassword function, when the     username map script smb.conf option is enabled, and allows remote authenticated users to execute     commands via shell metacharacters involving other MS-RPC functions in the (2) remote printer and (3) file     share management. (CVE-2007-2447)

  - Heap-based buffer overflow in the receive_smb_raw function in util/sock.c in Samba 3.0.0 through 3.0.29     allows remote attackers to execute arbitrary code via a crafted SMB response. (CVE-2008-1105)

  - Samba 3.4 before 3.4.2, 3.3 before 3.3.8, 3.2 before 3.2.15, and 3.0.12 through 3.0.36, as used in the SMB     subsystem in Apple Mac OS X 10.5.8 when Windows File Sharing is enabled, Fedora 11, and other operating     systems, does not properly handle errors in resolving pathnames, which allows remote authenticated users     to bypass intended sharing restrictions, and read, create, or modify files, in certain circumstances     involving user accounts that lack home directories. (CVE-2009-2813)

  - smbd in Samba 3.0 before 3.0.37, 3.2 before 3.2.15, 3.3 before 3.3.8, and 3.4 before 3.4.2 allows remote     authenticated users to cause a denial of service (infinite loop) via an unanticipated oplock break     notification reply packet. (CVE-2009-2906)

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

The version of Samba running on the remote host is affected by a remote code execution vulnerability due to improper validation of user-supplied input when passing RPC messages from external scripts to a shell. A remote, authenticated attacker can exploit this via the use of shell metacharacters during login negotiations when the 'username map script' option is enabled, or during the invocation of other printer and file management MS-RPC calls.

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2007-0354 advisory.

    [3.0.10-1.4E.12.2]
     - Security fixes for        CVE-2007-2446        CVE-2007-2447

Tenable has extracted the preceding description block directly from the Oracle 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.

Various bugs were found in NDR parsing, used to decode MS-RPC requests in Samba. A remote attacker could have sent carefully crafted requests causing a heap overflow, which may have led to the ability to execute arbitrary code on the server. (CVE-2007-2446)

Unescaped user input parameters were being passed as arguments to /bin/sh. A remote, authenticated, user could have triggered this flaw and executed arbitrary code on the server. Additionally on Scientific Linux 5 this flaw could be triggered by a remote unauthenticated user if Samba was configured to use the non-default 'username map script' option. (CVE-2007-2447)

Problems addressed by these patches :

I    Arbitrary code execution and denial of service vulnerabilities

     This release fixes a security vulnerability that could allow a      guest operating system user with administrative privileges to cause      memory corruption in a host process, and thus potentially execute      arbitrary code on the host. (CVE-2007-4496)

     This release fixes a denial of service vulnerability that could      allow a guest operating system to cause a host process to become      unresponsive or exit unexpectedly. (CVE-2007-4497)

     Thanks to Rafal Wojtczvk of McAfee for identifying and reporting      these issues.

II   Hosted products DHCP security vulnerabilities addressed

     This release fixes several vulnerabilities in the DHCP server      that could enable a specially crafted packets to gain system-level      privileges. (CVE-2007-0061, CVE-2007-0062, CVE-2007-0063)

     Thanks to Neel Mehta and Ryan Smith of the IBM Internet Security      Systems X-Force for discovering and researching these      vulnerabilities.

III  Windows based hosted product vulnerability in      IntraProcessLogging.dll and vielib.dll.

     This release fixes a security vulnerability that could allow a      malicious remote user to exploit the library file      IntraProcessLogging.dll to overwrite files in a system.
     (CVE-2007-4059)

     This release fixes a security vulnerability that could allow a      malicious remote user to exploit the library file vielib.dll to      overwrite files in a system. (CVE-2007-4155)

     Thanks to the Goodfellas Security Research Team for discovering and      researching these vulnerabilities.

IV  Escalation of privileges on Windows hosted systems

     This release fixes a security vulnerability in which Workstation      was starting registered Windows services in an insecure manner.
     This vulnerability could allow a malicious user to escalate user      privileges.

     Thanks to Foundstone for discovering this vulnerability.

V    Potential denial of service using VMware Player

     This release fixes a problem that prevented VMware Player from      launching. This problem was accompanied by the error message VMware      Player unrecoverable error: (player) Exception 0xc0000005 (access      violation) has occurred.

VI   ESX Service Console updates

a.   Service console package Samba, has been updated to address the      following issues :

     Various bugs were found in NDR parsing, used to decode MS-RPC      requests in Samba. A remote attacker could have sent carefully      crafted requests causing a heap overflow, which may have led to the      ability to execute arbitrary code on the server. (CVE-2007-2446)

     Unescaped user input parameters were being passed as arguments to      /bin/sh. A remote, authenticated, user could have triggered this      flaw and executed arbitrary code on the server. Additionally, this      flaw could be triggered by a remote unauthenticated user if Samba      was configured to use the non-default username map script option.
     (CVE-2007-2447)

     Thanks to the Samba developers, TippingPoint, and iDefense for      identifying and reporting these issues.

     Note: These issues only affect the service console network, and are      not remote vulnerabilities for ESX Server hosts that have been set      up with the security best practices provided by VMware.
     http://www.vmware.com/resources/techresources/726

b.   Updated bind package for the service console fixes a flaw with the      way ISC BIND processed certain DNS query responses.

     ISC BIND (Berkeley Internet Name Domain) is an implementation of      the DNS (Domain Name System) protocols. Under some circumstances, a      malicious remote user could launch a Denial-of-Service attack on      ESX Server hosts that had enabled DNSSEC validation.
     (CVE-2007-0494)

     Note: These issues only affect the service console network, and are      not remote vulnerabilities for ESX Server hosts that have been set      up with the security best practices provided by VMware.
     http://www.vmware.com/resources/techresources/726

c.   This patch provides updated service console package krb5 update.

     The Common Vulnerabilities and Exposures project (cve.mitre.org)      assigned the names CVE-2007-2442, CVE-2007-2443, and CVE-2007-2798      to these security issues.

     Thanks to Wei Wang of McAfee Avert Labs discovered these      vulnerabilities.

     Note: The VMware service console does not provide the kadmind      binary, and is not affected by these issues, but a update has been      provided for completeness.

d.   Service console update for vixie-cron

     This patch provides an updated service console package vixie-cron.
     Cron is a standard UNIX daemon that runs specified programs at      scheduled times.

     A denial of service issue was found in the way vixie-cron verified      crontab file integrity. A local user with the ability to create a      hardlink to /etc/crontab could potentially prevent vixie-cron from      executing certain system cron jobs. (CVE-2007-1856)

     Thanks to Raphael Marichez for identifying this issue.

e.   Service console update for shadow-utils

     This patch provides an updated shadow-utils package.  A new      user's mailbox, when created, could have random permissions for a      short period. This could enable a local malicious user to      read or modify the mailbox. (CVE-2006-1174)

f.  Service console update for OpenLDAP

     This patch provides a updated OpenLDAP package. A flaw could      allow users with selfwrite access to modify the distinguished      name of any user, instead of being limited to modify only      their own distinguished name. (CVE-2006-4600)

g.   Service console update for PAM

     This patch provides an updated PAM package A vulnerability was      found that could allow console users with access to certain device      files to cause damage to recordable CD drives. Certain file      permissions have now been modified to disallow access.
     (CVE-2004-0813)

     A flaw was found with console device permissions. It was possible      for various console devices to retain ownership of the previoius      console user after logging out, which could result in leakage of      information to an unauthorized user. (CVE-2007-1716)

h.   Service console update for GCC

     This patch provides security fixes for the service console GNU      Compiler Collection (GCC) packages that include C, C++, Java,      Fortran 77, Objective C, and Ada 95 GNU compilers and related      support libraries.

     A flaw was found in the fastjar utility that could potentially      allow a malicious user to create a JAR file which, if unpacked      using fastjar, could write to any file that an authorized user had      write access to. (CVE-2006-3619)

     Thanks to J&uuml;rgen Weigert for identifying this issue.

i.   Service Console update for GDB

     This patch provides a security fix for the service console GNU      debugger (GDB).  Various vulnerabilities were found in GDB. These      vulnerabilities may allow a malicious user to deceive a user into      loading debugging information into GDB, enabling the execution of      arbitrary code with the privileges of the user. (CVE-2006-4146)

According to its model number and software version, the remote host is a Xerox WorkCentre device that reportedly is affected by multiple buffer overflow and remote command injection issues.  Using specially- crafted RPC requests, an unauthenticated attacker could leverage these issues to run arbitrary code on the affected device or make unauthorized changes to its system configuration.

The previous security fix for CVE-2007-2447 missed one character in the shell escape handling.

Also fixed were some regressions introduced by the previous update.

Specially crafted MS-RPC packets could overwrite heap memory and therfore could potentially be exploited to execute code.
(CVE-2007-2446)

Authenticated users could leverage specially crafted MS-RPC packets to pass arguments unfiltered to /bin/sh. (CVE-2007-2447)

Paul Griffith and Andrew Hogue discovered that Samba did not fully drop root privileges while translating SIDs. A remote authenticated user could issue SMB operations during a small window of opportunity and gain root privileges. (CVE-2007-2444)

Brian Schafer discovered that Samba did not handle NDR parsing correctly. A remote attacker could send specially crafted MS-RPC requests that could overwrite heap memory and execute arbitrary code.
(CVE-2007-2446)

It was discovered that Samba did not correctly escape input parameters for external scripts defined in smb.conf. Remote authenticated users could send specially crafted MS-RPC requests and execute arbitrary shell commands. (CVE-2007-2447).

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.

Specially crafted MS-RPC packets could overwrite heap memory and therfore could potentially be exploited to execute code (CVE-2007-2446).

Authenticated users could leverage specially crafted MS-RPC packets to pass arguments unfiltered to /bin/sh (CVE-2007-2447).

A bug in the local SID/Name translation routines may potentially result in a user being able to issue SMB protocol operations as root (CVE-2007-2444).

Specially crafted MS-RPC packets could overwrite heap memory and therfore could potentially be exploited to execute code (CVE-2007-2446).

Authenticated users could leverage specially crafted MS-RPC packets to pass arguments unfiltered to /bin/sh (CVE-2007-2447).

The remote host is running a version of Mac OS X 10.4 or 10.3 which does not have the security update 2007-007 applied. 

This update contains several security fixes for the following programs :

 - bzip2
 - CFNetwork
 - CoreAudio
 - cscope
 - gnuzip
 - iChat
 - Kerberos
 - mDNSResponder
 - PDFKit
 - PHP
 - Quartz Composer
 - Samba
 - SquirrelMail
 - Tomcat
 - WebCore
 - WebKit

The Samba Team reports :

A bug in the local SID/Name translation routines may potentially result in a user being able to issue SMB/CIFS protocol operations as root.

When translating SIDs to/from names using Samba local list of user and group accounts, a logic error in the smbd daemon's internal security stack may result in a transition to the root user id rather than the non-root user. The user is then able to temporarily issue SMB/CIFS protocol operations as the root user. This window of opportunity may allow the attacker to establish additional means of gaining root access to the server.

Various bugs in Samba's NDR parsing can allow a user to send specially crafted MS-RPC requests that will overwrite the heap space with user defined data.

Unescaped user input parameters are passed as arguments to /bin/sh allowing for remote command execution.

This bug was originally reported against the anonymous calls to the SamrChangePassword() MS-RPC function in combination with the 'username map script' smb.conf option (which is not enabled by default).

After further investigation by Samba developers, it was determined that the problem was much broader and impacts remote printer and file share management as well. The root cause is passing unfiltered user input provided via MS-RPC calls to /bin/sh when invoking externals scripts defined in smb.conf. However, unlike the 'username map script' vulnerability, the remote file and printer management scripts require an authenticated user session.

According to its banner, the version of the Samba server installed on the remote host is affected by multiple buffer overflow and remote command injection vulnerabilities that can be exploited remotely, as well as a local privilege escalation bug. 

The remote Redhat Enterprise Linux 4 / 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2007:0354 advisory.

  - samba heap overflows (CVE-2007-2446)

  - samba code injection (CVE-2007-2447)

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

A number of bugs were discovered in the NDR parsing support in Samba that is used to decode MS-RPC requests. A remote attacker could send a carefully crafted request that would cause a heap overflow, possibly leading to the ability to execute arbitrary code on the server (CVE-2007-2446).

A remote authenticated user could trigger a flaw where unescaped user input parameters were being passed as arguments to /bin/sh (CVE-2007-2447).

Finally, on Samba 3.0.23d and higher, when Samba translated SID to/from name using the Samba local list of user and group accounts, a logic error in smbd's internal security stack could result in a transition to the root user id rather than the non-root user (CVE-2007-2444).

Update :

The fix for CVE-2007-2444 broke the behaviour of force group when the forced group is a local Unix group for domain member servers.

This update corrects that regression.

The remote host is affected by the vulnerability described in GLSA-200705-15 (Samba: Multiple vulnerabilities)

    Samba contains a logical error in the smbd daemon when translating     local SID to user names (CVE-2007-2444). Furthermore, Samba contains     several bugs when parsing NDR encoded RPC parameters (CVE-2007-2446).
    Lastly, Samba fails to properly sanitize remote procedure input     provided via Microsoft Remote Procedure Calls (CVE-2007-2447).
  Impact :

    A remote attacker could exploit these vulnerabilities to gain root     privileges via various vectors.
  Workaround :

    There is no known workaround at this time.

This release of Samba fixes some Serious security bugs :

  - CVE-2007-2444

    - CVE-2007-2446

    - CVE-2007-2447

Official upstream announcements here:
http://www.samba.org/samba/security/CVE-2007-2444.html http://www.samba.org/samba/security/CVE-2007-2446.html http://www.samba.org/samba/security/CVE-2007-2447.html

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.

Several issues have been identified in Samba, the SMB/CIFS file- and print-server implementation for GNU/Linux.

  - CVE-2007-2444     When translating SIDs to/from names using Samba local     list of user and group accounts, a logic error in the     smbd daemon's internal security stack may result in a     transition to the root user id rather than the non-root     user. The user is then able to temporarily issue     SMB/CIFS protocol operations as the root user. This     window of opportunity may allow the attacker to     establish addition means of gaining root access to the     server.

  - CVE-2007-2446     Various bugs in Samba's NDR parsing can allow a user to     send specially crafted MS-RPC requests that will     overwrite the heap space with user defined data.

  - CVE-2007-2447     Unescaped user input parameters are passed as arguments     to /bin/sh allowing for remote command execution.

Updated samba packages that fix several security flaws are now available.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Samba provides file and printer sharing services to SMB/CIFS clients.

Various bugs were found in NDR parsing, used to decode MS-RPC requests in Samba. A remote attacker could have sent carefully crafted requests causing a heap overflow, which may have led to the ability to execute arbitrary code on the server. (CVE-2007-2446)

Unescaped user input parameters were being passed as arguments to /bin/sh. A remote, authenticated, user could have triggered this flaw and executed arbitrary code on the server. Additionally, on Red Hat Enterprise Linux 5 only, this flaw could be triggered by a remote unauthenticated user if Samba was configured to use the non-default 'username map script' option. (CVE-2007-2447)

Users of Samba should upgrade to these packages, which contain backported patches to correct these issues. After upgrading, Samba should be restarted using 'service smb restart'

On Red Hat Enterprise Linux 5 the impact of these issues is reduced as Samba is constrained by the default SELinux 'targeted' policy.

Red Hat would like to thank the Samba developers, TippingPoint, and iDefense for reporting these issues.

New samba packages are available for Slackware 10.0, 10.1, 10.2, 11.0, and -current to fix security issues.

According to its banner, the version of the Samba server installed on the remote host is affected by multiple buffer overflow and remote command injection vulnerabilities, which can be exploited remotely, as well as a local privilege escalation bug.

ID	Name	Product	Family	Severity
206855	NewStart CGSL MAIN 6.02 : samba Multiple Vulnerabilities (NS-SA-2024-0054)	Nessus	NewStart CGSL Local Security Checks	critical
82580	Samba 3.0.0 'SamrChangePassword' RCE	Nessus	Misc.	medium
67499	Oracle Linux 5 : Critical: / samba (ELSA-2007-0354)	Nessus	Oracle Linux Local Security Checks	critical
60180	Scientific Linux Security Update : samba on SL5.x, SL4.x, SL3.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	critical
40370	VMSA-2007-0006 : Critical security updates for all supported versions of VMware ESX Server, VMware Server, VMware Workstation, VMware ACE, and VMware Player	Nessus	VMware ESX Local Security Checks	critical
29965	Xerox WorkCentre Multiple Samba Vulnerabilities (XRX08-001)	Nessus	Misc.	critical
29577	SuSE 10 Security Update : Samba (ZYPP Patch Number 3829)	Nessus	SuSE Local Security Checks	medium
29576	SuSE 10 Security Update : Samba (ZYPP Patch Number 3351)	Nessus	SuSE Local Security Checks	critical
28059	Ubuntu 6.06 LTS / 6.10 / 7.04 : samba vulnerabilities (USN-460-1)	Nessus	Ubuntu Local Security Checks	critical
27432	openSUSE 10 Security Update : samba (samba-3828)	Nessus	SuSE Local Security Checks	medium
27431	openSUSE 10 Security Update : samba (samba-3827)	Nessus	SuSE Local Security Checks	medium
27430	openSUSE 10 Security Update : samba (samba-3350)	Nessus	SuSE Local Security Checks	critical
27429	openSUSE 10 Security Update : samba (samba-3349)	Nessus	SuSE Local Security Checks	critical
25830	Mac OS X Multiple Vulnerabilities (Security Update 2007-007)	Nessus	MacOS X Local Security Checks	critical
25260	FreeBSD : samba -- multiple vulnerabilities (3546a833-03ea-11dc-a51d-0019b95d4f14)	Nessus	FreeBSD Local Security Checks	critical
3990	Samba < 3.0.25 Multiple Vulnerabilities	Nessus Network Monitor	Samba	high
25239	RHEL 4 / 5 : samba (RHSA-2007:0354)	Nessus	Red Hat Local Security Checks	critical
25237	Mandrake Linux Security Advisory : samba (MDKSA-2007:104-1)	Nessus	Mandriva Local Security Checks	critical
25236	GLSA-200705-15 : Samba: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
25234	Fedora Core 6 : samba-3.0.24-5.fc6 (2007-507)	Nessus	Fedora Local Security Checks	high
25233	Fedora Core 5 : samba-3.0.24-5.fc5 (2007-506)	Nessus	Fedora Local Security Checks	high
25228	Debian DSA-1291-1 : samba - several vulnerabilities	Nessus	Debian Local Security Checks	critical
25224	CentOS 3 / 4 / 5 : samba (CESA-2007:0354)	Nessus	CentOS Local Security Checks	critical
25222	Slackware 10.0 / 10.1 / 10.2 / 11.0 / current : samba (SSA:2007-134-01)	Nessus	Slackware Local Security Checks	critical
25217	Samba < 3.0.25 Multiple Vulnerabilities	Nessus	Misc.	critical

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