ExploitFixes
GNU binutils - 'disassemble_bytes' Heap Overflow 2017-06-19 19:05:05

Source: https://sourceware.org/bugzilla/show_bug.cgi?id=21580

I have been fuzzing objdump with American Fuzzy Lop and AddressSanitizer.

Please find attached the minimized file causing the issue ("Input") and the
ASAN report log ("Output"). Below is the reduced stacktrace with links to the
corresponding source lines on a GitHub mirror.

The command I used was `objdump -D <file>`.

Let me know if there is any additional information I can provide.

--

Input: 37a2b1374545eb23eed0eea880de6226.ad5cda09828cea9d238db2184e95406b.min
Output: 37a2b1374545eb23eed0eea880de6226.ad5cda09828cea9d238db2184e95406b.txt

Error in "disassemble_bytes": heap-buffer-overflow
in disassemble_bytes at binutils/objdump.c:1993
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L1993)
in disassemble_section at binutils/objdump.c:2309
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2309)
in bfd_map_over_sections at bfd/section.c:1395
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/section.c#L1395)
in disassemble_data at binutils/objdump.c:2445
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2445)
in dump_bfd at binutils/objdump.c:3547
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3547)
in display_file at binutils/objdump.c:3714
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3714)
in main at binutils/objdump.c:4016
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L4016)

Input: 77125fccb44694b0db18006db1f0f4d3.64e76dd7ab33d15c8293caeca73c704a.min
Output: 77125fccb44694b0db18006db1f0f4d3.64e76dd7ab33d15c8293caeca73c704a.txt

Error in "disassemble_bytes": heap-buffer-overflow
in disassemble_bytes at binutils/objdump.c:1932
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L1932)
in disassemble_section at binutils/objdump.c:2309
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2309)
in bfd_map_over_sections at bfd/section.c:1395
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/section.c#L1395)
in disassemble_data at binutils/objdump.c:2445
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2445)
in dump_bfd at binutils/objdump.c:3547
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3547)
in display_file at binutils/objdump.c:3714
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3714)
in main at binutils/objdump.c:4016
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L4016)

Input: c3269b8eae3f3ec0001d835e66795702.6e6557284eb14f91acf6c2576396517c.min
Output: c3269b8eae3f3ec0001d835e66795702.6e6557284eb14f91acf6c2576396517c.txt

Error in "disassemble_bytes": heap-buffer-overflow
in disassemble_bytes at binutils/objdump.c:1926
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L1926)
in disassemble_section at binutils/objdump.c:2309
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2309)
in bfd_map_over_sections at bfd/section.c:1395
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/section.c#L1395)
in disassemble_data at binutils/objdump.c:2445
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2445)
in dump_bfd at binutils/objdump.c:3547
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3547)
in display_file at binutils/objdump.c:3714
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3714)
in main at binutils/objdump.c:4016
(see https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L4016)


Additional Information:
The command used was `objdump -D <file>`. The compilation flags used were `-g -O2 -fno-omit-frame-pointer -fsanitize=address -fno-sanitize-recover=undefined`. The configuration settings used were `--enable-targets=all --disable-shared`.


Proofs of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/42199.zip