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Vigil@nce: pam_krb5, privilege elevation via existing_ticket

October 2008 by Vigil@nce

When the existing_ticket option is used by pam_krb5, an attacker
can call a privileged program in order to obtain the Kerberos
ticket of another user.

 Gravity: 2/4
 Consequences: user access/rights
 Provenance: user account
 Means of attack: 1 attack
 Ability of attacker: technician (2/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 02/10/2008

IMPACTED PRODUCTS

 Fedora
 Mandriva Linux
 Red Hat Enterprise Linux
 Unix - plateform

DESCRIPTION

The pam_krb5 module authenticates users via a Kerberos server. The
existing_ticket option of pam_krb5 indicates to search for tickets
in the cache and to use them.

However, when existing_ticket is enabled, privileges are not lost
to search in the cache. An attacker can therefore use "su" or
"sudo" to access to the cache in a privileged manner and obtain
the ticket of another user.

A local attacker can therefore connect to the account of a victim
with a cached Kerberos ticket.

CHARACTERISTICS

 Identifiers: 461960, BID-31534, CVE-2008-3825, FEDORA-2008-8605,
FEDORA-2008-8618, MDVSA-2008:209, RHSA-2008:0907-01,
VIGILANCE-VUL-8142
 Url: http://vigilance.aql.fr/vulnerability/8142


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