CVE-2010-0014 - Improper Authentication

Severity

37%

Complexity

19%

Confidentiality

106%

System Security Services Daemon (SSSD) before 1.0.1, when the krb5 auth_provider is configured but the KDC is unreachable, allows physically proximate attackers to authenticate, via an arbitrary password, to the screen-locking program on a workstation that has any user's Kerberos ticket-granting ticket (TGT); and might allow remote attackers to bypass intended access restrictions via vectors involving an arbitrary password in conjunction with a valid TGT.

System Security Services Daemon (SSSD) before 1.0.1, when the krb5 auth_provider is configured but the KDC is unreachable, allows physically proximate attackers to authenticate, via an arbitrary password, to the screen-locking program on a workstation that has any user's Kerberos ticket-granting ticket (TGT); and might allow remote attackers to bypass intended access restrictions via vectors involving an arbitrary password in conjunction with a valid TGT.

CVSS 2.0 Base Score 3.7. CVSS Attack Vector: local. CVSS Attack Complexity: high. CVSS Vector: (AV:L/AC:H/Au:N/C:P/I:P/A:P).

Demo Examples

Improper Authentication

CWE-287

The following code intends to ensure that the user is already logged in. If not, the code performs authentication with the user-provided username and password. If successful, it sets the loggedin and user cookies to "remember" that the user has already logged in. Finally, the code performs administrator tasks if the logged-in user has the "Administrator" username, as recorded in the user cookie.


               
}
}
ExitError("Error: you need to log in first");
);
);
DoAdministratorTasks();

Unfortunately, this code can be bypassed. The attacker can set the cookies independently so that the code does not check the username and password. The attacker could do this with an HTTP request containing headers such as:


               
[body of request]

By setting the loggedin cookie to "true", the attacker bypasses the entire authentication check. By using the "Administrator" value in the user cookie, the attacker also gains privileges to administer the software.

Improper Authentication

CWE-287

Overview

Type

Fedora SSSD

First reported 15 years ago

2010-01-14 18:30:00

Last updated 15 years ago

2010-01-15 05:00:00

Affected Software

Fedora SSSD - System Security Services Daemon 0.2.1

0.2.1

Fedora SSSD - System Security Services Daemon 0.3.0

0.3.0

Fedora SSSD - System Security Services Daemon 0.3.1

0.3.1

Fedora SSSD - System Security Services Daemon 0.3.2

0.3.2

Fedora SSSD - System Security Services Daemon 0.3.3

0.3.3

Fedora SSSD - System Security Services Daemon 0.4.0

0.4.0

Fedora SSSD - System Security Services Daemon 0.4.1

0.4.1

Fedora SSSD - System Security Services Daemon 0.5.0

0.5.0

Fedora SSSD - System Security Services Daemon 0.6.0

0.6.0

Fedora SSSD - System Security Services Daemon 0.6.1

0.6.1

Fedora SSSD - System Security Services Daemon 0.7.0

0.7.0

Fedora SSSD - System Security Services Daemon 0.7.1

0.7.1

Fedora SSSD - System Security Services Daemon 0.99.0

0.99.0

Fedora SSSD - System Security Services Daemon 0.99.1

0.99.1

Fedora SSSD System Security Services Daemon

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