[ GLSA 200409-16 ] Samba: Denial of Service vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: Samba: Denial of Service vulnerabilities (GLSA 200409-16)
Severity: normal
Exploitable: remote
Date: September 13, 2004
ID: 200409-16

Synopsis


Two Denial of Service vulnerabilities have been found and fixed in Samba.


Background


Samba is a freely available SMB/CIFS implementation which allows seamless
interoperability of file and print services to other SMB/CIFS clients. smbd
and nmbd are two daemons used by the Samba server.


Affected Packages

Package: net-fs/samba
Vulnerable: < 3.0.7
Unaffected: >= 3.0.7
Unaffected: < 3.0
Architectures: All supported architectures


Description


There is a defect in smbd's ASN.1 parsing. A bad packet received during the
authentication request could throw newly-spawned smbd processes into an
infinite loop (CAN-2004-0807). Another defect was found in nmbd's
processing of mailslot packets, where a bad NetBIOS request could crash the
nmbd process (CAN-2004-0808).


Impact


A remote attacker could send specially crafted packets to trigger both
defects. The ASN.1 parsing issue can be exploited to exhaust all available
memory on the Samba host, potentially denying all service to that server.
The nmbd issue can be exploited to crash the nmbd process, resulting in a
Denial of Service condition on the Samba server.


Workaround


There is no known workaround at this time.


Resolution


All Samba 3.x users should upgrade to the latest version: