[DLA 37-1] krb5 security update

Package : krb5
Version : 1.8.3+dfsg-4squeeze8
CVE ID : CVE-2014-4341 CVE-2014-4342 CVE-2014-4343 CVE-2014-4344
CVE-2014-4345
Debian Bug : #753624 #753625 #755520 #755521 #757416

Several vulnerabilities were discovered in krb5, the MIT implementation
of Kerberos. The Common Vulnerabilities and Exposures project identifies
the following problems:

CVE-2014-4341

 An unauthenticated remote attacker with the ability to inject
 packets into a legitimately established GSSAPI application session
 can cause a program crash due to invalid memory references when
 attempting to read beyond the end of a buffer.

CVE-2014-4342

 An unauthenticated remote attacker with the ability to inject
 packets into a legitimately established GSSAPI application session
 can cause a program crash due to invalid memory references when
 reading beyond the end of a buffer or by causing a null pointer
 dereference.

CVE-2014-4343

 An unauthenticated remote attacker with the ability to spoof packets
 appearing to be from a GSSAPI acceptor can cause a double-free
 condition in GSSAPI initiators (clients) which are using the SPNEGO
 mechanism, by returning a different underlying mechanism than was
 proposed by the initiator. A remote attacker could exploit this flaw
 to cause an application crash or potentially execute arbitrary code.

CVE-2014-4344

 An unauthenticated or partially authenticated remote attacker can
 cause a NULL dereference and application crash during a SPNEGO
 negotiation by sending an empty token as the second or later context
 token from initiator to acceptor.

CVE-2014-4345

 When kadmind is configured to use LDAP for the KDC database, an
 authenticated remote attacker can cause it to perform an
 out-of-bounds write (buffer overflow).