From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Sep 14 2004 - 03:23:17 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

TITLE:
Samba Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA12516

VERIFY ADVISORY:
http://secunia.com/advisories/12516/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
From local network

SOFTWARE:
Samba 3.x
http://secunia.com/product/2999/

DESCRIPTION:
Two vulnerabilities have been reported in Samba, which can be
exploited by malicious people to cause a DoS (Denial of Service).

1) An error exists in smbd within the ASN.1 parsing functionality.
This can be exploited via specially crafted packets during
authentication to spawn many new processes, which enter infinite
loops.

Successful exploitation may exhaust all available memory resources.

2) An input validation error exists in nmbd within the
"process_logon_packet()" function when processing mailslot packets.
This can be exploited to crash the daemon via a specially crafted
"SAM_UAS_CHANGE" request.

Successful exploitation requires that the daemon has been configured
to process domain logons ("domain logons = yes" in smb.conf).

The vulnerabilities affect version 3.0.6 and prior.

SOLUTION:
Update to version 3.0.7.
http://us3.samba.org/samba/news/releases/#3.0.7

PROVIDED AND/OR DISCOVERED BY:
Discovered by anonymous person and reported via iDEFENSE.

ORIGINAL ADVISORY:
Samba:
http://us3.samba.org/samba/history/3.0_DOS_sept04_announce.txt

iDEFENSE:
http://www.idefense.com/application/poi/display?id=138&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=139&type=vulnerabilities

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/

Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories

----------------------------------------------------------------------

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]