alainx277/cve-2025-24797ثغرة تجاوز سعة المخزن المؤقت في Meshtastic - CVE-2025-24797
يؤدي عطل في معالجة حزم الشبكة (mesh) التي تحتوي على بيانات protobuf غير صالحة إلى حدوث تجاوز في السعة (buffer overflow) يتحكم فيه المهاجم، مما يسمح له باختطاف تدفق التنفيذ، وربما يؤدي إلى تنفيذ تعليمات برمجية عن بُعد (RCE). لا يتطلب هذا الهجوم مصادقة أو تفاعل المستخدم، طالما أن الجهاز الهدف يعيد بث الحزم على القناة الافتراضية.
تم اكتشاف الثغرة الأمنية في الأصل باستخدام تقنية التمويه (fuzzing)، مما أدى إلى إحباط ASAN التالي:
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