alainx277/cve-2025-24797Meshtastic-Pufferüberlauf-Schwachstelle - CVE-2025-24797
Ein Fehler in der Verarbeitung von Mesh-Paketen, die ungültige Protobuf-Daten enthalten, kann zu einem angreifergesteuerten Pufferüberlauf führen. Dies ermöglicht einem Angreifer, den Ausführungsfluss zu übernehmen und potenziell Remote-Code-Ausführung zu erreichen. Dieser Angriff erfordert keine Authentifizierung oder Benutzerinteraktion, solange das Zielgerät Pakete auf dem Standardkanal weiterleitet.
Die Schwachstelle wurde ursprünglich durch Fuzzing entdeckt, was zu folgendem ASAN-Abbruch führte:
DEBUG | 22:27:03 0 State: BOOT
DEBUG | 22:27:03 0 Lora RX (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted hopStart=3)
DEBUG | 22:27:03 0 Packet RX: 845ms
DEBUG | 22:27:03 0 [Router] Add packet record (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted hopStart=3)
DEBUG | 22:27:03 0 [Router] Use channel 0 (hash 0x8)
DEBUG | 22:27:03 0 [Router] Expand short PSK #1
DEBUG | 22:27:03 0 [Router] Use AES128 key!
ERROR | 22:27:03 0 [Router] Can't decode protobuf reason='wrong wire type', pb_msgdesc 0x55f23cf543c0
ERROR | 22:27:03 0 [Router] Invalid protobufs in received mesh packet id=0x76f4febf (bad psk?)!
WARN | 22:27:03 0 [Router] No suitable channel found for decoding, hash was 0x8!
DEBUG | 22:27:03 0 [Router] packet decoding failed or skipped (no PSK?) (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted rxtime=1736461623 hopStart=3)
DEBUG | 22:27:03 0 [Router] Module 'routing' wantsPacket=1
INFO | 22:27:03 0 [Router] Received routing from=0x10, id=0x76f4febf, portnum=10320, payloadlen=25
DEBUG | 22:27:03 0 [Router] Routing sniffing (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted rxtime=1736461623 hopStart=3)
INFO | 22:27:03 0 [Router] Rebroadcast received floodmsg
DEBUG | 22:27:03 0 [Router] enqueuing for send (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=2 Ch=0x8 encrypted rxtime=1736461623 hopStart=3 priority=64)
DEBUG | 22:27:03 0 [Router] Set random delay before tx
DEBUG | 22:27:03 0 [Router] Delivering rx packet (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted rxtime=1736461623 hopStart=3)
DEBUG | 22:27:03 0 [Router] Forwarding to phone (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=3 Ch=0x8 encrypted rxtime=1736461623 hopStart=3)
ERROR | 22:27:03 0 [Router] Packet too large to attempt decryption! (rawSize=10320 > 256)
DEBUG | 22:27:03 0 [Router] Module 'routing' considered
DEBUG | 22:27:03 0 [SimRadio] delay done
DEBUG | 22:27:03 0 [SimRadio] Start low level send (id=0x76f4febf fr=0x10 to=0xff, WantAck=0, HopLim=2 Ch=0x8 encrypted rxtime=1736461623 hopStart=3 priority=64)
=================================================================
==6992==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6130000006e0 at pc 0x7f85755a7397 bp 0x7fff161319a0 sp 0x7fff16131148
READ of size 10320 at 0x6130000006e0 thread T0
#0 0x7f85755a7396 in __interceptor_memcpy ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
#1 0x55f23a1c40d2 in RadioInterface::beginSending(_meshtastic_MeshPacket*) src/mesh/RadioInterface.cpp:621
#2 0x55f23a297a8d in SimRadio::startSend(_meshtastic_MeshPacket*) src/platform/portduino/SimRadio.cpp:261
#3 0x55f23a29782f in SimRadio::onNotify(unsigned int) src/platform/portduino/SimRadio.cpp:231
#4 0x55f23a0c8ee2 in concurrency::NotifiedWorkerThread::checkNotification() src/concurrency/NotifiedWorkerThread.cpp:82
#5 0x55f23a0c8f3c in concurrency::NotifiedWorkerThread::runOnce() src/concurrency/NotifiedWorkerThread.cpp:89
#6 0x55f23a0c9623 in concurrency::OSThread::run() src/concurrency/OSThread.cpp:85
#7 0x55f23a2d0f66 in ThreadController::runOrDelay() .pio/libdeps/native/Thread/ThreadController.cpp:59
#8 0x55f23a154893 in loop src/main.cpp:1259
#9 0x55f23a3a54db in main /home/alain/.platformio/packages/framework-portduino/cores/portduino/main.cpp:226
#10 0x7f8574ad7d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
#11 0x7f8574ad7e3f in __libc_start_main_impl ../csu/libc-start.c:392
#12 0x55f239f8f8b4 in _start (/home/alain/marc/program+0x1098b4)
0x6130000006e0 is located 0 bytes to the right of 352-byte region [0x613000000580,0x6130000006e0)
allocated by thread T0 here:
#0 0x7f8575621887 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x55f23a1d55ac in MemoryDynamic<_meshtastic_MeshPacket>::alloc(unsigned int) src/mesh/MemoryPool.h:71
#2 0x55f23a16aeb3 in Allocator<_meshtastic_MeshPacket>::allocCopy(_meshtastic_MeshPacket const&, unsigned int) src/mesh/MemoryPool.h:38
#3 0x55f23a16a573 in FloodingRouter::perhapsRebroadcast(_meshtastic_MeshPacket const*) src/mesh/FloodingRouter.cpp:60
#4 0x55f23a16a91e in FloodingRouter::sniffReceived(_meshtastic_MeshPacket const*, _meshtastic_Routing const*) src/mesh/FloodingRouter.cpp:97
#5 0x55f23a1ca301 in ReliableRouter::sniffReceived(_meshtastic_MeshPacket const*, _meshtastic_Routing const*) src/mesh/ReliableRouter.cpp:141
#6 0x55f23a220710 in RoutingModule::handleReceivedProtobuf(_meshtastic_MeshPacket const&, _meshtastic_Routing*) src/modules/RoutingModule.cpp:26
#7 0x55f23a22141f in ProtobufModule<_meshtastic_Routing>::handleReceived(_meshtastic_MeshPacket const&) src/mesh/ProtobufModule.h:100
#8 0x55f23a17e8fa in MeshModule::callModules(_meshtastic_MeshPacket&, RxSource) src/mesh/MeshModule.cpp:132
#9 0x55f23a1d437b in Router::handleReceived(_meshtastic_MeshPacket*, RxSource) src/mesh/Router.cpp:618
#10 0x55f23a1d5211 in Router::perhapsHandleReceived(_meshtastic_MeshPacket*) src/mesh/Router.cpp:681
#11 0x55f23a1cfc2c in Router::runOnce() src/mesh/Router.cpp:71
#12 0x55f23a1cc01d in ReliableRouter::runOnce() src/mesh/ReliableRouter.h:79
#13 0x55f23a0c9623 in concurrency::OSThread::run() src/concurrency/OSThread.cpp:85
#14 0x55f23a2d0f66 in ThreadController::runOrDelay() .pio/libdeps/native/Thread/ThreadController.cpp:59
#15 0x55f23a154893 in loop src/main.cpp:1259
#16 0x55f23a3a54db in main /home/alain/.platformio/packages/framework-portduino/cores/portduino/main.cpp:226
#17 0x7f8574ad7d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
SUMMARY: AddressSanitizer: heap-buffer-overflow ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy
Shadow bytes around the buggy address:
0x0c267fff8080: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c267fff8090: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c267fff80a0: fd fd fd fd fa fa fa fa fa fa fa fa fa fa fa fa
0x0c267fff80b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c267fff80c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c267fff80d0: 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa fa
0x0c267fff80e0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c267fff80f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c267fff8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c267fff8110: 00 00 00 00 fa fa fa fa fa fa fa fa fa fa fa fa
0x0c267fff8120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==6992==ABORTING