National Vulnerability Database (NVD) National Vulnerability Database (CVE-2007-3149)

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Last updated: Tue Aug 25 09:30:03 EDT 2009

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Vulnerability Summary for CVE-2007-3149

Original release date:06/11/2007

Last revised:09/05/2008

Source: US-CERT/NIST

Overview

sudo, when linked with MIT Kerberos 5 (krb5), does not properly check whether a user can currently authenticate to Kerberos, which allows local users to gain privileges, in a manner unintended by the sudo security model, via certain KRB5_ environment variable settings. NOTE: another researcher disputes this vulnerability, stating that the attacker must be "a user, who can already log into your system, and can already use sudo."

Impact

CVSS Severity (version 2.0):

CVSS v2 Base Score:7.2 (HIGH) (AV:L/AC:L/Au:N/C:C/I:C/A:C) (legend)

Impact Subscore: 10.0

Exploitability Subscore: 3.9

CVSS Version 2 Metrics:

Access Vector: Locally exploitable

Access Complexity: Low

Authentication: Not required to exploit

Impact Type:Provides administrator access, Allows complete confidentiality, integrity, and availability violation; Allows unauthorized disclosure of information; Allows disruption of service

Vendor Statments (disclaimer)

Official Statement from Red Hat (06/11/2007): Not vulnerable. Versions of sudo package shipped with Red Hat Enterprise Linux versions 2.1, 3, 4 and 5 are linked with PAM support and never use libkrb5 authentication.

References to Advisories, Solutions, and Tools

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External Source: CONFIRM

Name: http://www.sudo.ws/cgi-bin/cvsweb/sudo/auth/kerb5.c

Hyperlink:http://www.sudo.ws/cgi-bin/cvsweb/sudo/auth/kerb5.c

External Source: BID

Name: 24368

Hyperlink:http://www.securityfocus.com/bid/24368

External Source: BUGTRAQ

Name: 20070607 Re: Sudo: local root compromise with krb5 enabled

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/470774/100/0/threaded

External Source: BUGTRAQ

Name: 20070607 MIT krb5: makes sudo authentication issue MUCH worse.

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/470752/100/0/threaded