Note: This is an archival copy of Security Sun Alert 200877 as previously published on http://sunsolve.sun.com. Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1000666.1. |
Category Security Release Phase Resolved Solaris 9 Operating System Solaris 10 Operating System Bug Id 6218964 Date of Workaround Release 23-JUN-2005 Date of Resolved Release 17-OCT-2006 Impact A security vulnerability in Samba's "ms_fnmatch()" function may allow a remote unprivileged user the ability to create a Denial of Service (DoS) by causing excessive CPU consumption via a Samba request that contains multiple wildcard characters. This issue is referenced in the following document:
Contributing Factors This issue can occur in the following releases: SPARC Platform
x86 Platform
Note: Solaris 7 and Solaris 8 do not include the Samba software and are not affected by this issues. Sun does include Samba on the Solaris Companion CD for Solaris 8 as an unsupported package which installs to "/opt/sfw" and is vulnerable to this issue. Sites using the freeware version of Samba from the Solaris Companion CD will need to upgrade to a later version from Samba.org. The described issue only occurs if both of the following conditions are true:
To determine if a system is configured as a Samba server, use the following command to check for the presence of the smb.conf(4) file: % ls -l /etc/sfw/smb.conf -rw-r--r-- 1 root other 11665 Sep 28 16:37 /etc/sfw/smb.conf If the output is similar to that shown above, the system is configured as a Samba server. To determine the version of Samba installed on a system, the following command can be run: % /usr/sfw/sbin/smbd -V Version 3.0
Symptoms If the described issue occurs, the Samba server running on an impacted machine will consume more CPU cycles than normal, reducing the quality of service provided by the Samba server. In some circumstances the server may become entirely unresponsive. Workaround The Samba Server Security web page: http://www.samba.org/samba/docs/server_security.html documents several ways to restrict access to Samba servers and further protect Samba servers. Sites may consider applying the advice there even for patched systems. Until patches are available or can be applied, sites may consider downloading and compiling Samba 3.0.8 or higher from the Samba site at: http://www.samba.org as an interim workaround. Note however that the downloaded Samba software is not supported by Sun. Resolution This issue is addressed in the following releases: SPARC Platform
x86 Platform
Modification History Date: 24-JUN-2005 Change History
Date: 17-OCT-2006
References119757-01119758-01 114684-05 114685-05 Attachments This solution has no attachment |
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