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Bug #2755

closed

BSSMAP Cipher Mode Reject lacks the Cause IE

Added by neels over 6 years ago. Updated over 6 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
12/14/2017
Due date:
% Done:

100%

Spec Reference:

Description

wireshark says:

No.     Time           Length Source                Source Port Destination           Destination Port Protocol Media Port Context-ID CN-DomainIndicator Info
    337 25.967697395   122    187                               185                                    BSSAP                                             SACK DT1 (BSSMAP) Cipher Mode Reject 

Frame 337: 122 bytes on wire (976 bits), 122 bytes captured (976 bits) on interface 1
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Stream Control Transmission Protocol, Src Port: 2905 (2905), Dst Port: 43964 (43964)
MTP 3 User Adaptation Layer
Signalling Connection Control Part
BSSAP
GSM A-I/F BSSMAP - Cipher Mode Reject
    Message Type Cipher Mode Reject
    Missing Mandatory element (0x04) Cause, rest of dissection is suspect
        [Expert Info (Warning/Protocol): Missing Mandatory element (0x04) Cause, rest of dissection is suspect]
            [Missing Mandatory element (0x04) Cause, rest of dissection is suspect]
            [Severity level: Warning]
            [Group: Protocol]
    Extraneous Data, dissector bug or later version spec(report to wireshark.org)
        [Expert Info (Note/Protocol): Extraneous Data, dissector bug or later version spec(report to wireshark.org)]
            [Extraneous Data, dissector bug or later version spec(report to wireshark.org)]
            [Severity level: Note]
            [Group: Protocol]

Attached is a pcap showing the packets leading up to a cipher mode reject. Ignore the errors causing the cipher mode reject (comes from #2745), the point is that the reject message itself is apparently malformed.


Files

Actions #1

Updated by neels over 6 years ago

  • Assignee changed from dexter to neels

I think I've already fixed this "for free" ... will comment later

Actions #2

Updated by laforge over 6 years ago

  • Status changed from New to Closed
  • % Done changed from 0 to 100

I can confirm that the message now contains a valid cause value.

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