National Cyber-Alert System
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):
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
- 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
External Source: BID
Name: 24368
External Source: BUGTRAQ
Name: 20070607 Re: Sudo: local root compromise with krb5 enabled
External Source: BUGTRAQ
Name: 20070607 MIT krb5: makes sudo authentication issue MUCH worse.
External Source: BUGTRAQ
Name: 20070607 Sudo: local root compromise with krb5 enabled
External Source: SECUNIA
Name: 26540