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Vigil@nce - MIT krb5: change String attributes via kadmin

March 2012 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker, who is allowed to list String attributes via kadmin,
is also allowed to change them.

Severity: 1/4

Creation date: 09/03/2012

IMPACTED PRODUCTS

 MIT krb5

DESCRIPTION OF THE VULNERABILITY

The kadmin protocol is used by kadmind, in order to exchange
administration requests: add a principal, etc.

An object can have attributes of type String. The
get_strings_2_svc() and set_string_2_svc() functions of the
src/kadmin/server/server_stubs.c file read and change this
attributes. However, access controls to these functions are not
restricted.

An attacker, who is allowed to list String attributes via kadmin,
is therefore also allowed to change them.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/MIT-krb5-change-String-attributes-via-kadmin-11411


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