Nintendo Switch Brew

Switch System Flaws: Difference between revisions

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m Flesh out detail on Splatoon 3 report based on HackerOne summary.
 
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| May 4, 2025
| May 4, 2025
| [[User:Yellows8|yellows8]]
| [[User:Yellows8|yellows8]]
|-
| [[SSL_services|ssl]] Certificate verification bypass
| The ssl sysmodule keeps a list of trusted certificates, that are imported by an app with ImportServerPki. During certificate verification, if the certificate that is provided by the server has the same subject key id as a trusted certificate, the certificate is accepted, even if self-signed. A blog post about this vulnerability can be found [https://reversing.live/sslbypass.html here].
| Man-in-the-middle for any connection that uses ImportServerPki.
| [[20.2.0]]
| [[20.2.0]]
| June 6, 2025
| August 8, 2025
| [https://github.com/kinnay Yannik]
|-
|-
| [[LDN_services|ldn]] AdvertiseData OOB-memcpy with EncryptionType3 (AES-128-GCM) actionframes (ldnhax)
| [[LDN_services|ldn]] AdvertiseData OOB-memcpy with EncryptionType3 (AES-128-GCM) actionframes (ldnhax)
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| November 2021?
| November 2021?
| November 26, 2025
| November 26, 2025
| [[User:Yellows8|yellows8]]
|-
| [[Bluetooth_Driver_services|bluetooth]] BSA gatt_process_prep_write_rsp stack buffer overflow
| BSA gatt_process_prep_write_rsp memcpys to stack without size validation (the input len param which is subtracted to determine the copy-size is also unvalidated). Triggering this is only possible if the system sent ATT_PREPARE_WRITE_REQ, and then received ATT_PREPARE_WRITE_RSP with a large size.
The size used with memcpy is (u16)(insize-4), so when insize is less than 4 the copy size will be {negative value masked to u16}. This will therefore eventually crash when the stacktop is reached during memcpy.
[15.0.0+] Paritially fixed due to corrected MTU handling (doesn't apply to negative-copysize). [21.0.0+] Fully fixed with proper size validation.
| Stack buffer overflow in bluetooth-sysmodule when the required ATT messages are sent/received.
| [[21.0.0]]
| [[21.0.0]]
| November 2021?
| January 19, 2026
| [[User:Yellows8|yellows8]]
| [[User:Yellows8|yellows8]]
|}
|}
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| December 31, 2020
| December 31, 2020
| [[User:Yellows8|yellows8]]
| [[User:Yellows8|yellows8]]
|}
=== NEX ===
This section documents client-side vulnerabilities for [https://github.com/Kinnay/NintendoClients/wiki/NEX-Overview-(Game-Servers) NEX].
{| class="wikitable" border="1"
|-
!  Summary
!  Description
!  Successful exploitation result
!  Fixed in version
!  Timeframe this was discovered
!  Public disclosure timeframe
!  Discovered by
|-
| Buffer overflow in StringConversion::T2Char8
| StringConversion::T2Char8 is used to convert IP addresses from a platform-specific encoding to UTF-8. On the 3DS and Switch, the implementation is simply a strcpy. By sending a long IP address string, a buffer overflow can be triggered on the stack. The vulnerability can be triggered through the NAT traversal protocol. A blog post about this vulnerable can be found [https://reversing.live/hacking-hundreds-of-wii-us-at-once.html here].
| Stack overflow in any game that uses NEX for matchmaking
| Fixed server-side
| December, 2022
| May, 2024
| [https://github.com/kinnay Yannik]
|}
|}


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| Early April 2022
| Early April 2022
| November 16, 2022
| November 16, 2022
| [[User:Rambo6Glaz|Rambo6Glaz]], Kinnay (massive RE help)
| [[User:Rambo6Glaz|Rambo6Glaz]], [https://github.com/kinnay Yannik] (massive RE help)
|}
|}


There's another one more interesting but it will have to wait a bit :)
There's another one more interesting but it will have to wait a bit :)
== Games ==
{| class="wikitable" border="1"
|-
! Game
!  Summary
!  Description
!  Impact
!  Fixed in version
!  Timeframe this was discovered
!  Public disclosure timeframe
!  Discovered by
|-
| Mario Kart World
| ASLR leak in application data
| A memory address can be leaked by changing your username to something short, and hosting a network session in LAN mode (press L + R + Left Stick on the main menu to enable this). The memory address can be found in bytes 12 - 19 of the application data that is transmitted in response to a browse request.
'''Note:''' there is more uninitialized data in the packet, but the memory address is probably the most interesting part. The vulnerability was fixed by clearing the application data with zeros, before filling in the information.
[https://hackerone.com/reports/3463719 HackerOne report]
This stack infoleak was also present in the [[LDN_services|ldn]] AdvertiseData.
| A memory address can leaked (this is a requirement for many types of attacks).
| 1.5.0
| December 12, 2025
| February 19, 2026
| [https://github.com/kinnay Yannik], yellows8 (ldn)
|-
| Splatoon 3
| Anticheat Seed Randomization Weakness
| This oversight of seed generation would allow an attacker to quickly compute all code hashes, and modify game code, while still producing a valid ch1 hash.
[https://hackerone.com/reports/3042475 HackerOne report]
| Allows an attacker to bypass the ch1 anti-cheat hashing mechanism.
| 10.0.0
| March 17, 2025
| February 19, 2026
| hana2736
|}
Retrieved from "https://switchbrew.org/wiki/Switch_System_Flaws"