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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200404-21] Multiple Vulnerabilities in Samba


Vulnerability Assessment Details

[GLSA-200404-21] Multiple Vulnerabilities in Samba

Vulnerability Assessment Summary
Multiple Vulnerabilities in Samba

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200404-21
(Multiple Vulnerabilities in Samba)


Two vulnerabilities have been discovered in Samba. The first vulnerability
permits a local user who has access to the smbmount command to gain root. An
attacker could place a setuid-root binary on a Samba share/server he or she
controls, and then use the smbmount command to mount the share on the
target UNIX box. The remote Samba server must support UNIX extensions for
this to work. This has been fixed in version 3.0.2a.
The second vulnerability is in the smbprint script. By creating a symlink
from /tmp/smbprint.log, a possible hacker could cause the smbprint script to
write to an arbitrary file on the system. This has been fixed in version
3.0.2a-r2.

Impact

Local users with access to the smbmount command may gain root access. Also,
arbitrary files may be overwritten using the smbprint script.

Workaround

To workaround the setuid bug, remove the setuid bits from the
/usr/bin/smbmnt, /usr/bin/smbumount and /usr/bin/mount.cifs binaries.
However, please note that this workaround will prevent ordinary users from
mounting remote SMB and CIFS shares.
To work around the smbprint vulnerability, set "debug=no" in the smbprint
configuration.

References:
http://www.securityfocus.com/archive/1/353222/2004-04-09/2004-04-15/1
http://seclists.org/lists/bugtraq/2004/Mar/0189.html


Solution:
All users should update to the latest version of the Samba package.
The following commands will perform the upgrade:
# emerge sync
# emerge -pv ">=net-fs/samba-3.0.2a-r2"
# emerge ">=net-fs/samba-3.0.2a-r2"
Those who are using Samba's password database also need to run the
following command:
# pdbedit --force-initialized-passwords
Those using LDAP for Samba passwords also need to check the sambaPwdLastSet
attribute on each account, and ensure it is not 0.


Network Security Threat Level: Medium


Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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