Buffer overflow in grfmt_pxm.cpp::PxMDecoder::readData

[Epeius]

System information (version)

• OpenCV => 3.3.1
• Operating System / Platform => Ubuntu 16.04
• Compiler => clang++

Detailed description

A buffer overflow occurs in function cv::PxMDecoder::readData in file imgcodecs/src/grfmt_pxm.cpp.

The crash details as follows:

=================================================================
==18453==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60900000c7d0 at pc 0x0000004722da bp 0x7ffff06fba60 sp 0x7ffff06fb210
WRITE of size 32 at 0x60900000c7d0 thread T0
    #0 0x4722d9 in memcpy (/home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit+0x4722d9)
    #1 0x563c4e in cv::PxMDecoder::readData(cv::Mat&) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/imgcodecs/src/grfmt_pxm.cpp:337:25
    #2 0x515691 in cv::imread_(cv::String const&, int, int, cv::Mat*) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/imgcodecs/src/loadsave.cpp:487:13
    #3 0x51282c in cv::imread(cv::String const&, int) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/imgcodecs/src/loadsave.cpp:638:5
    #4 0x50aef1 in main /home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit.cpp:14:25
    #5 0x7ff8636e5f44 in __libc_start_main /build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:287
    #6 0x42f9e3 in _start (/home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit+0x42f9e3)

0x60900000c7d0 is located 0 bytes to the right of 16-byte region [0x60900000c7c0,0x60900000c7d0)
allocated by thread T0 here:
    #0 0x4da825 in __interceptor_posix_memalign (/home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit+0x4da825)
    #1 0x9aa819 in cv::fastMalloc(unsigned long) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/core/src/alloc.cpp:64:8
    #2 0xb8333a in cv::StdMatAllocator::allocate(int, int const*, int, void*, unsigned long*, int, cv::UMatUsageFlags) const /home/test_opencv/fuzz/target/opencv-3.3.1/modules/core/src/matrix.cpp:191:55
    #3 0xa8a42a in cv::Mat::create(int, int const*, int) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/core/src/matrix.cpp:429:17
    #4 0x54d4d9 in cv::Mat::create(int, int, int) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/core/include/opencv2/core/mat.inl.hpp:784:5
    #5 0x515129 in cv::imread_(cv::String const&, int, int, cv::Mat*) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/imgcodecs/src/loadsave.cpp:473:13
    #6 0x51282c in cv::imread(cv::String const&, int) /home/test_opencv/fuzz/target/opencv-3.3.1/modules/imgcodecs/src/loadsave.cpp:638:5
    #7 0x50aef1 in main /home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit.cpp:14:25
    #8 0x7ff8636e5f44 in __libc_start_main /build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:287

SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/test_opencv/fuzz/target/opencv-3.3.1/samples/cpp/example_cmake/for_submit+0x4722d9) in memcpy
Shadow bytes around the buggy address:
  0x0c127fff98a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff98b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff98c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff98d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff98e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c127fff98f0: fa fa fa fa fa fa fa fa 00 00[fa]fa fa fa fa fa
  0x0c127fff9900: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff9910: fd fd fd fd fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff9920: fd fd fd fd fd fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff9930: fd fd fd fd fd fa fa fa fa fa fa fa fa fa fa fa
  0x0c127fff9940: fd fd fd fd fa fa fa fa fa fa fa fa fa fa fa fa
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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==18453==ABORTING

Steps to reproduce

Please refer to the following url for the testcases:
https://github.com/Epeius/NBPOC/blob/master/poc

[carnil]

This issue was assigned CVE-2017-17760