GLSA 200407-21: Samba: Multiple buffer overflows

http://security.gentoo.org/

Severity:	high
Title:	Samba: Multiple buffer overflows
Date:	07/29/2004
Bugs:	#57962
ID:	200407-21

Synopsis

Two buffer overflows vulnerabilities were found in Samba, potentially allowing the remote execution of arbitrary code.

Background

Samba is a package which allows *nix systems to act as file servers for Windows computers. It also allows *nix systems to mount shares exported by a Samba/CIFS/Windows server. The Samba Web Administration Tool (SWAT) is a web-based configuration tool part of the Samba package.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-fs/samba	<= 3.0.4-r1	>= 3.0.5	All supported architectures

Description

Evgeny Demidov found a buffer overflow in SWAT, located in the base64 data decoder used to handle HTTP basic authentication (CAN-2004-0600). The same flaw is present in the code used to handle the sambaMungedDial attribute value, when using the ldapsam passdb backend. Another buffer overflow was found in the code used to support the 'mangling method = hash' smb.conf option (CAN-2004-0686). Note that the default Samba value for this option is 'mangling method = hash2' which is not vulnerable.

Impact

The SWAT authentication overflow could be exploited to execute arbitrary code with the rights of the Samba daemon process. The overflow in the sambaMungedDial handling code is not thought to be exploitable. The buffer overflow in 'mangling method = hash' code could also be used to execute arbitrary code on vulnerable configurations.

Workaround

Users disabling SWAT, not using ldapsam passdb backends and not using the 'mangling method = hash' option are not vulnerable.

Resolution

All Samba users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-fs/samba-3.0.5"
    # emerge ">=net-fs/samba-3.0.5"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200407-21.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.