Heap buffer overflow in csv.h:668

[fCorleone]

Heap buffer overflow occurred
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

=================================================================
==9445==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7ffff06ff7ff at pc 0x000000412fd4 bp 0x7fffffffd710 sp 0x7fffffffd700
READ of size 1 at 0x7ffff06ff7ff thread T0
    #0 0x412fd3 in io::trim_chars<(char)32, (char)9>::trim(char*&, char*&) /home/mfc_fuzz/cpp-csv-parser/csv.h:688
    #1 0x412fd3 in void io::detail::parse_header_line<3u, io::trim_chars<(char)32, (char)9>, io::no_quote_escape<(char)44> >(char*, std::vector<int, std::allocator<int> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const*, unsigned int) /home/mfc_fuzz/cpp-csv-parser/csv.h:884
    #2 0x414261 in void io::CSVReader<3u, io::trim_chars<(char)32, (char)9>, io::no_quote_escape<(char)44>, io::throw_on_overflow, io::no_comment>::read_header<char const*, char const*, char const*>(unsigned int, char const*, char const*, char const*) /home/mfc_fuzz/cpp-csv-parser/csv.h:1146
    #3 0x4027f7 in main /home/mfc_fuzz/cpp-csv-parser/main.c:7
    #4 0x7ffff652882f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #5 0x405008 in _start (/home/mfc_fuzz/cpp-csv-parser/prog+0x405008)

0x7ffff06ff7ff is located 1 bytes to the left of 50331648-byte region [0x7ffff06ff800,0x7ffff36ff800)
allocated by thread T0 here:
    #0 0x7ffff6f036b2 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x996b2)
    #1 0x40ea27 in io::LineReader::init(std::unique_ptr<io::ByteSourceBase, std::default_delete<io::ByteSourceBase> >) /home/mfc_fuzz/cpp-csv-parser/csv.h:346
    #2 0x40ea27 in io::LineReader::LineReader(char const*) /home/mfc_fuzz/cpp-csv-parser/csv.h:367
    #3 0x40ea27 in io::CSVReader<3u, io::trim_chars<(char)32, (char)9>, io::no_quote_escape<(char)44>, io::throw_on_overflow, io::no_comment>::CSVReader<char*&>(char*&) /home/mfc_fuzz/cpp-csv-parser/csv.h:1119

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/mfc_fuzz/cpp-csv-parser/csv.h:688 io::trim_chars<(char)32, (char)9>::trim(char*&, char*&)
Shadow bytes around the buggy address:
  0x10007e0d7ea0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x10007e0d7eb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x10007e0d7ec0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x10007e0d7ed0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x10007e0d7ee0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x10007e0d7ef0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
  0x10007e0d7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007e0d7f10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007e0d7f20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007e0d7f30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007e0d7f40: 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
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  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
==9445==ABORTING

The test driver and the input case is displayed at :
https://github.com/fCorleone/fuzz_programs/blob/master/fast-cpp-csv-parser/test-driver.c
https://github.com/fCorleone/fuzz_programs/blob/master/fast-cpp-csv-parser/inputcase1

[ben-strasser]

Thank you for reporting this bug.

I just pushed a fix. Can you please check, if the bug is also resolved on your end?

If you find further fuzzer bugs, please report them. Such bug reports are very useful.

[carnil]

This issue was assigned CVE-2018-13421