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[ GLSA 200409-16 ] Samba: Denial of Service vulnerabilities
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GLSA
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PostPosted: Mon Sep 13, 2004 1:18 pm    Post subject: [ GLSA 200409-16 ] Samba: Denial of Service vulnerabilities Reply with quote

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:
Code:
# emerge sync
# emerge -pv ">=net-fs/samba-3.0.7"
# emerge ">=net-fs/samba-3.0.7"


References

CAN-2004-0807
CAN-2004-0808


Last edited by GLSA on Sun May 07, 2006 4:52 pm; edited 1 time in total
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