Bugzilla – Bug 1218293
VUL-0: CVE-2023-4232: ofono: SMS Decoder Stack-based Buffer Overflow Remote Code Execution Vulnerability within the decode_status_report() function
Last modified: 2023-12-21 09:15:05 UTC
ofono is a Open Source Telephony on Linux stack overflow bug is triggered within the decode_status_report() function during SMS decoding here assumed that the attack scenario is accessible from a compromised modem or possibily accessible from a malicious base station or just SMS there is a bound check for this memcpy length in decode_submit(), but they forgot it in decode_status_report() this is a variant from ZDI-CAN-20971 partial code path is here - at_cmt_notify() - ofono_sms_deliver_notify() - sms_decode() - decode_status_report() ``` ~~~C++ static gboolean decode_status_report(const unsigned char *pdu, int len, struct sms *out) { ... if (out->status_report.pi & 0x04) { int expected; if (!next_octet(pdu, len, &offset, &out->status_report.udl)) return FALSE; expected = sms_udl_in_bytes(out->status_report.udl, out->status_report.dcs); if ((len - offset) < expected) return FALSE; memcpy(out->status_report.ud, pdu + offset, expected); // overflow here, expected is from SMS PDU } return TRUE; } ~~~ ASAN report ``` ================================================================= ==118708==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffffffe26c at pc 0x7ffff7849846 bp 0x7fffffffdf50 sp 0x7fffffffd6f8 WRITE of size 224 at 0x7fffffffe26c thread T0 #0 0x7ffff7849845 in __interceptor_memcpy ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 #1 0x555555940bb5 in decode_status_report src/smsutil.c:1077 #2 0x55555594449c in sms_decode src/smsutil.c:1571 #3 0x5555558e008d in main src/main.c:225 #4 0x7ffff742350f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58 #5 0x7ffff74235c8 in __libc_start_main_impl ../csu/libc-start.c:381 #6 0x55555567f274 in _start (/root/ofono/src/ofonod+0x12b274) Address 0x7fffffffe26c is located in stack of thread T0 at offset 316 in frame #0 0x5555558dfedd in main src/main.c:205 This frame has 1 object(s): [48, 316) 'sms1' (line 212) <== Memory access at offset 316 overflows this variable HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-buffer-overflow ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy Shadow bytes around the buggy address: 0x10007fff7bf0: 00 00 f1 f1 f1 f1 f1 f1 01 f2 04 f3 f3 f3 00 00 0x10007fff7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 0x10007fff7c10: f1 f1 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 0x10007fff7c20: 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 0x10007fff7c30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x10007fff7c40: 00 00 00 00 00 00 00 00 00 00 00 00 00[04]f3 f3 0x10007fff7c50: f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 0x10007fff7c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 ==118708==ABORTING ``` References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-4232 https://bugzilla.redhat.com/show_bug.cgi?id=2255394 https://www.zerodayinitiative.com/advisories/ZDI-23-1860/