/usr/share/wireshark/radius/README.radius_dictionary is in libwireshark-data 1.6.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 Commented out global VSA:s from dictionary.ascend to avoid name clashes with IANA assigned VSA:s
 https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5455
 
[Jul-09-2009]
As of the above date the dictionary files in this directory are those from the FreeRadius 2.1.6 [May-18-2009] release
with the following changes:
1. dictionary
   - enabled  include: dictionary.cisco.vpn3000
   - disabled include: dictionary.vqp
   - disabled include: dictionary.freeradius.internal
   - added    include: dictionary.chillispot: as per the 2009-06-11 commit in the FreeRadius repository.
   - added: Comment re Wireshark usage of the integer data type.
2. Added <return> to the end of several of the files;
   - dictionary.airespace
   - dictionary.freeswitch
   - dictionary.h3c
3. dictionary.wimax
   - Freeradius 2.1.6 dictionary.wimax plus:
      Added missing END-VENDOR WIMAX statement.
   - Note that Attribute WiMAX-MN-hHA-MIP4-SPI [11] had a type of "octets"
     in the previous Wireshark version of this file.
     This attribute in the FreeRadius version of this file
     has an attribute type of "integer".
4. dictionary.cablelabs
   - FreeRadius v 2.1.6 dictionary.cablelabs plus additions based upon:
      PacketCable(TM) 1.5 Specification: Event Messages [PKT-SP-EM1.5-I03-070412]
      PacketCable(TM) Specification: Multimedia Specification [PKT-SP-MM-I04-080522]
   - Added additional comments and changes related to Wireshark use of this file.
 
5. dictionary.microsoft
   - FreeRadius v 2.1.6 dictionary.microsoft plus additions based upon
     Wireshark commit SVN #17706.
     Essentially: Add "VALUES" for
      ATTRIBUTE MS-MPPE-Encryption-Policy  and
      ATTRIBUTE MS-MPPE-Encryption-Types.
6. dictionary.nortel
   - FreeRadius v 2.1.6 dictionary.nortel plus addition per:
     2009-07-01 commit in the FreeRadius repository.
7. dictionary.cisco.vpn3000
   - FreeRadius 2.1.6 dictionary.cisco.vpn3000 plus additions:
     a. VALUEs as defined in the previous Wireshark version of dictionary.cisco.vpn3000;
     b. ATTRIBUTEs as defined in:
        http://www.cisco.com/en/US/docs/security/vpn3000/vpn3000_47/configuration/guide/ldapapp.html#wp1564468
        Additions from the FreeRadius version are marked with "## [wireshark]".
8. dictionary.aruba
   - FreeRadius 2.1.6 dictionary.aruba plus additions:
     See Wireshark Bug #3104 and SVN #26945;
     See also: https://airheads.arubanetworks.com/vBulletin/showthread.php?t=910
9. dictionary.3gpp2
   - FreeRadius 2.1.6 dictionary.3gpp2 plus updates based upon
      the latest 3GPP2 specification:
       "cdma2000 Wireless IP Network Standard: Accounting Services and 3GPP2 Radius VSAs
        3GPP2 X.S0011-005-D
        Version: 2.0
        Version Date: November 2008"
       http://www.3gpp2.org/public_html/Specs/X.S0011-005-D_v2.0_081103.pdf
10. dictionary.3gpp
   - FreeRadius 2.1.6 dictionary.3gpp plus updates based upon:
	http://pda.etsi.org/exchangefolder/ts_129061v080300p.pdf
 	 (ETSI TS 129 061 V8.3.0 (2009-06))
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