Security Vulnerability in samba(7) Specially Crafted Packet May Allow Execution of Arbitrary Code With Root Privileges

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Security Vulnerability in samba(7) Specially Crafted Packet May Allow Execution of Arbitrary Code With Root Privileges

1. Impact

A heap-based buffer overflow in the Samba client (SMBCLIENT(1)) may allow a remote unprivileged user to execute arbitrary code using a crafted SMB response. Since the Samba daemon (smbd(1M)) can also act as the client during operations such as printer notification and domain authentication, this issue affects both the Samba client and server.

Additional information on this issue can be found in the following document:


2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 9 without patch 114684-12
• Solaris 10 without patch 119757-13

x86 Platform

• Solaris 9 without patch 114685-12
• Solaris 10 without patch 119758-13

with the following versions of Samba software:

• Samba 3.0.0 through 3.0.29

Notes:

1. Solaris 8 does not include the Samba software and therefore is not affected by this issue.

To determine the version of Samba installed on a system, the following command can be run:

% /usr/sfw/sbin/smbd -V
Version  3.0.4

To determine if a system is configured as a Samba server, the following command can be run to check for processes related to Samba:

% ps -ef | grep mbd
root   317     1   0   May 26 ?           0:01 /usr/sfw/sbin/smbd -D
root   325   317   0   May 26 ?           0:00 /usr/sfw/sbin/smbd -D
root   314     1   0   May 26 ?           0:27 /usr/sfw/sbin/nmbd -D
root 28369 17382   0 23:17:46 pts/2       0:00 grep mbd

If the output shows "smbd" or "nmbd" running as a daemon (with the -D parameter), the system is configured as a Samba server.

3. Symptoms

There are no predictable symptoms that would indicate the described vulnerability has been exploited to run arbitrary code with the privileges of the root user.

4. Workaround

To work around the described issue for the Samba server, the Samba service may be stopped by using the following command:

On Solaris 9

# /etc/init.d/samba stop

On Solaris 10

# svcadm disable samba

5. Resolution

SPARC Platform

• Solaris 9 with patch 114684-12 or later
• Solaris 10 with patch 119757-13 or later

x86 Platform

• Solaris 9 with patch 114685-12 or later
• Solaris 10 with patch 119758-13 or later

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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