The provided tools assess SIM card security in two dimensions:
- Cryptanalytic attack surface. Collect cryptographic signatures and encryptions of known plaintexts
- Application attack surface. Generate a list of all application identifiers (TAR) and find "unprotected" (MSL=0) applications
- Java 1.7 (code can be easily tweaked to compile under Java 1.6 or even lower if needed)
- PC/SC reader (via pcsc daemon) –or–
- Osmocom phone (via libosmosim)
Running SIMTester on LiveISO¶
Choose "Run Test" -> "SIM" from main menu, follow instructions.
Running SIMTester by hand¶
SIMTester is a Java application (JAR archive), both sources and binaries are accessible under SIMTester git (https://opensource.srlabs.de:/git/SIMtester.git).
tar xvzf SIMtester.tar.gz
You can either compile your own JAR from sources or run the pre-compiled JAR in "binaries/" directory like this:
java -jar SIMTester.jar <arguments>
|command line option||description|
||verifies the PIN, works for CHV1|
||skips verification of a PIN and ignore permission errors (may produce incomplete results!)|
||disables PIN, works for CHV1 (ideal for testing cards so no PIN database in needed)|
||what are you using as SIM card reader|
||multiple PC/SC readers can be connected, first is 0|
SIMTester contains 3 main functionalities:¶
Fuzzer¶Has its own intelligent logic, fuzzes ~120 chosen TARs, is divided into 3 modes:
- Full fuzzing (default) - all 15 keysets with all 16 fuzzing mechanisms
- Quick fuzzing (-qf option) - keysets 1 to 6, only 4 most successful fuzzing mechanisms
- Poke the card (-poke option) - same as quick fuzzing but only fuzzes 3 most common TARs (000000, B00001, B00010)
Custom keysets and TARs can be specified via -t and -k parameters (space being a delimiter between multiple values).
TAR Scanner¶Scans for valid TAR values by sending messages to them, has 2 modes:
- Full scan (-st option) - scans for all possible TAR values (0x000000 - 0xFFFFFF) - may take a few hours or several days depending on your SIM card speed
- Ranged scan (-str option) - scans for valid TAR values in pre-specified ranges to optimise the scanning duration
A starting value for Full scan can be specified using -t option.
A keyset used for sending messages can be specified using -k option (for both Full and Ranged scans).
Tip: run fuzzer first, see what keysets seem responsive (give answers other than none) and use one of those for TAR scanning, because if you use an inactive keyset it's very probable the card will NOT answer even on a valid TAR which makes TAR scanning non-functional.
APDU Scanner¶Scans for valid APDU values (think of APDUs as of commands to the card) on TARs without any public APDU reference, it has 2 modes:
- LEVEL 1 scan (performed automatically after Fuzzer finishes and has found unprotected TARs with responses) - only scans for valid CLA 0x00 - 0xFF - it is performed via OTA messages.
- LEVEL 2 scan (-sa option) - scans for both CLA 0x00 - 0xFF and INS 0x00 - 0xFF - it is performed locally on card I/O on initially selected application
Using OsmocomBB phone as a SIM reader¶
This requires a patched firmware and a libosmosim.so library. Patched sources can be found in luca/libosmosim branch in OsmocomBB git tree:
git clone git://git.osmocom.org/osmocom-bb.git cd osmocom-bb/ git checkout luca/libosmosim
once compiled use the
layer1.compalram.bin firmware and copy
layer23/src/libosmosim/.libs/) to your java.library.path folder (usually
/usr/lib/jni/ on Linux).
then just use
-tf OsmocomBB to turn your Osmocom phone into a SIM card reader for SIMTester.
Software uses several libraries, if compiled from source the following libraries are needed:
A public mailing list for announcements and discussion can be found here