Project

General

Profile

Actions
Copy link

Bug #6181

open

Unexpected INS code with simtrace2-sniff: 0x7f

Added by v.marinos 8 months ago. Updated 7 months ago.

Status:
Feedback
Priority:
Normal
Assignee:
v.marinos
Category:
-
Target version:
-
Start date:
09/15/2023
Due date:
% Done:

0%

Spec Reference:

Description

Hello,

I used `simtrace2-sniff` to sniff the messages between my sysmocom SIM cards and a Google Pixel 5, during 5G SA registration. I captured the traffic with tcpdump over port 4729 (pcap file attached).

I am using Open5GS and srsRAN (5G) for the core and RAN respectively. The phone connects to the core successfully and has internet access.

When I replay the captured messages with pySim-trace I get the following error: "ValueError: Unknown CLA=A4 INS=7F". Wireshark also shows the same INS code, as Unknown (0x7f).

I looked at ETSI TS 102 221 V17.1.0 (2022-02), Table 10.5, and couldn't find any reference of APDU with INS code 0x7f.

Do you have any insights on why this APDU is showing up?

Thanks,
Marinos

Files

full_registration_4.pcap full_registration_4.pcap 111 KB v.marinos, 09/15/2023 03:34 PM
full_registration_5.pcap full_registration_5.pcap 31.5 KB v.marinos, 09/15/2023 07:25 PM
Actions
Copy link

Also available in: Atom PDF

Add picture from clipboard (Maximum size: 48.8 MB)