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License: GNU General Public License v3.0
If you try to compile the project in a directory with spaces in the name, it fails while running in a "sed" command.
github address
https://github.com/ArchimedesCAD/libredwg
compile the test case in the source
./configure
make
gcc testSVG.c -I../src/ ../src/.libs/libredwg.a -lm -o fuzz_svg
test with poc
./fuzz_svg segment_poc
the gdb output
Program received signal SIGSEGV, Segmentation fault.
[----------------------------------registers-----------------------------------]
RAX: 0x1f5
RBX: 0x0
RCX: 0x1b
RDX: 0x2
RSI: 0x629390 --> 0x4003
RDI: 0x6d1480 --> 0x3000000017
RBP: 0x7fffffffd690 --> 0x7fffffffd6f0 --> 0x7fffffffe240 --> 0x7fffffffe260 --> 0x0
RSP: 0x7fffffffd668 --> 0x40171d (<output_BLOCK_HEADER+227>: mov QWORD PTR [rbp-0x10],rax)
RIP: 0x401e0f (<get_first_owned_object+63>: mov rax,QWORD PTR [rax])
R8 : 0x7fffffff
R9 : 0x414fc0 ("Found null object reference. Could not output an SVG symbol for this BLOCK_HEADER\n")
R10: 0x7ffff7acc6a0 --> 0x0
R11: 0x246
R12: 0x400d90 (<_start>: xor ebp,ebp)
R13: 0x7fffffffe340 --> 0x2
R14: 0x0
R15: 0x0
EFLAGS: 0x10246 (carry PARITY adjust ZERO sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
0x401e00 <get_first_owned_object+48>: repz ret
0x401e02 <get_first_owned_object+50>: nop WORD PTR [rax+rax*1+0x0]
0x401e08 <get_first_owned_object+56>: mov rax,QWORD PTR [rsi+0x98]
=> 0x401e0f <get_first_owned_object+63>: mov rax,QWORD PTR [rax]
0x401e12 <get_first_owned_object+66>: ret
0x401e13: data32 data32 data32 nop WORD PTR cs:[rax+rax*1+0x0]
0x401e20 <get_next_owned_object>: mov rax,QWORD PTR [rdi+0x30]
0x401e24 <get_next_owned_object+4>: mov eax,DWORD PTR [rax]
[------------------------------------stack-------------------------------------]
0000| 0x7fffffffd668 --> 0x40171d (<output_BLOCK_HEADER+227>: mov QWORD PTR [rbp-0x10],rax)
0008| 0x7fffffffd670 --> 0x41519c --> 0x3e736665643c09 ('\t<defs>')
0016| 0x7fffffffd678 --> 0x6295f0 --> 0x6d1480 --> 0x3000000017
0024| 0x7fffffffd680 --> 0x0
0032| 0x7fffffffd688 --> 0x629390 --> 0x4003
0040| 0x7fffffffd690 --> 0x7fffffffd6f0 --> 0x7fffffffe240 --> 0x7fffffffe260 --> 0x0
0048| 0x7fffffffd698 --> 0x401935 (<output_SVG+469>: add DWORD PTR [rbp-0x34],0x1)
0056| 0x7fffffffd6a0 --> 0x40d1a0a52e680c34
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x0000000000401e0f in get_first_owned_object (hdr_obj=0x6d1480, hdr=0x629390) at dwg.c:359
359 return hdr->first_entity->obj;
gdb-peda$ p hdr->first_entity
$1 = (Dwg_Object_Ref *) 0x1f5 # !!!!!! illegal pointer
gdb-peda$ p hdr->first_entity->obj
Cannot access memory at address 0x1f5
gdb-peda$
As you can see, the hdr->first_entity
is now a illegal pointer , and we got crash
Program received signal SIGSEGV, Segmentation fault.
By using asan , I found this is an heap overflow vulnerability
the binary and the poc:
http://hac425.unaux.com/usr/uploads/2018/07/2407654350.zip
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