| Bug ID |
8303
|
| Summary |
NAS-EPS: wrong decoding of Protocol Configuration Options
|
| Classification |
Unclassified
|
| Product |
Wireshark
|
| Version |
1.8.5
|
| Hardware |
x86
|
| OS |
Windows XP
|
| Status |
UNCONFIRMED
|
| Severity |
Major
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
[email protected]
|
| Reporter |
[email protected]
|
Build Information:
--
Hi
Sometimes the Protocol Configuration Options is wrongly decoded.
I attached 2 files:
- PCO_DecodingOK_RRCmessage.pcap: this is a lte-rrc.dl.dcch message with a NAS
EPS Mobility Management Message
=> this message is well decoded:
[Protocols in frame: user_dlt:lte_rrc:nas-eps]
DLT: 147, Payload: lte-rrc.dl.dcch (LTE Radio Resource Control (RRC) protocol)
c1: rrcConnectionReconfiguration (4)
DedicatedInfoNAS: 27c7f79bfb02074201e1060000f110000b002bf201c10105...
Protocol Configuration Options
Element ID: 0x27
Length: 17
[Link direction: Network to MS (1)]
1... .... = Ext: 0x01
Configuration Protocol: PPP for use with IP PDP type or IP PDN type (0)
Protocol or Container ID: Internet Protocol Control Protocol (0x8021)
Length: 0x00 (0)
Protocol or Container ID: DNS Server IPv4 Address (0x000d)
Length: 0x04 (4)
IPv4: 172.22.1.201
Protocol or Container ID: Reserved (0x000a)
Length: 0x00 (0)
Protocol or Container ID: Selected Bearer Control Mode (0x0005)
Length: 0x00 (0)
- PCO_WrongDecoding_AttachAccept.pcap: this is the same NAS message as above,
but decoded at NAS side _only_
=> this message is wrongly decoded:
[Protocols in frame: user_dlt:nas-eps]
NAS EPS Mobility Management Message Type: Attach accept (0x42)
ESM message container
Length: 43
ESM message container contents:
f201c101050c037777770373746503636f6d0501c0a800f7...
NAS EPS session management messages: Activate default EPS bearer context
request (0xc1)
Protocol Configuration Options
Element ID: 0x27
Length: 17
[Link direction: Network to MS (1)]
1... .... = Ext: 0x01
Configuration Protocol: PPP for use with IP PDP type or IP PDN type (0)
Protocol or Container ID: Internet Protocol Control Protocol (0x8021)
Length: 0x00 (0)
Protocol or Container ID: DNS Server IPv4 Address (0x000d)
Length: 0x04 (4)
IPv4: 172.22.0.10
Protocol or Container ID: Unknown (0x0000)
Length: 0x05 (5)
[Malformed Packet: NAS-EPS]
[Expert Info (Error/Malformed): Malformed Packet (Exception occurred)]
[Message: Malformed Packet (Exception occurred)]
[Severity level: Error]
[Group: Malformed]
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