From: SecuriTeam <support@securiteam.com.>
To: [email protected]
Date: 11 Jul 2006 19:24:06 +0200
Subject: [UNIX] Samba smbd Memory Exhaustion DoS
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-Id: <20060712092102.2F17557A8@mail.tyumen.ru.>
X-Virus-Scanned: antivirus-gw at tyumen.ru
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
Samba smbd Memory Exhaustion DoS
------------------------------------------------------------------------
SUMMARY
"The <http://www.samba.org/>; smbd daemon maintains internal data
structures used track active connections to file and printer shares."
smbd may allow internal structures maintaining state for share connections
to grow unbounded.
DETAILS
Vulnerable Systems:
* Samba version 3.0.1 and above
* Samba version 3.0.22 and prior
In certain circumstances an attacker may be able to continually increase
the memory usage of an smbd process by issuing a large number of share
connection requests. This defect affects all Samba configurations.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2006-3403>;
CAN-2006-3403
Vendor Status:
The vendor has issued a patch:
Index: source/smbd/service.c
-==================================================================
--- source/smbd/service.c (revision 16676)
+++ source/smbd/service.c (working copy)
@@ -763,6 +763,11 @@
smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
}
+ if (conn_num_open() > 2047) {
+ *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
+ return NULL;
+ }
+
if(lp_security() != SEC_SHARE) {
vuser = get_valid_user_struct(vuid);
if (!vuser) {
ADDITIONAL INFORMATION
The information has been provided by <mailto:jerry@samba.org.> Gerald
(Jerry) Carter.
The original article can be found at:
<http://www.samba.org/samba/security/CAN-2006-3403.html>;
http://www.samba.org/samba/security/CAN-2006-3403.html
The patch can be downloaded at:
<http://us4.samba.org/samba/ftp/patches/security/samba-3.0-CAN-2006-3403.patch>; http://us4.samba.org/samba/ftp/patches/security/samba-3.0-CAN-2006-3403.patch
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: [email protected]
In order to subscribe to the mailing list, simply forward this email to: [email protected]
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
