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Created attachment 1292558[details]
Triggered by "dwarfdump POC1"
Description of problem:
There is a unknown memory access in _dwarf_decode_s_leb128_chk() of dwarfdump. A crafted input will lead to remote denial of service attack.
Version-Release number of selected component (if applicable):
<= latest version
How reproducible:
./dwarfdump $POC
Steps to Reproduce:
The normal and asan debug information are as follows:
$ ./dwarfdump POC1
.debug_info
ASAN:DEADLYSIGNAL
=================================================================
==42828==ERROR: AddressSanitizer: SEGV on unknown address 0x60462c598e45 (pc 0x0000005c5129 bp 0x60462c598e45 sp 0x7ffca7481000 T0)
#0 0x5c5128 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c5128)
#1 0x60fd37 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x60fd37)
#2 0x60044e (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x60044e)
#3 0x5ff21a (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5ff21a)
#4 0x5c6057 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c6057)
#5 0x51423d (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x51423d)
#6 0x511f72 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x511f72)
#7 0x4f7f08 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x4f7f08)
#8 0x7f47af33582f (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#9 0x419458 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x419458)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c5128)
==42828==ABORTING
The vulnerability was triggered in function int
_dwarf_decode_s_leb128_chk() at dwarf_leb.c:291. We don't analyze the reason of the trigger careful, but the 'unknow address' reported by ASAN is readable by gdb.
273 _dwarf_decode_s_leb128_chk(Dwarf_Small * leb128, Dwarf_Word * leb128_length,
274 Dwarf_Signed *outval,Dwarf_Byte_Ptr endptr)
275 {
...
280 /* The byte_length value will be a small non-negative integer. */
281 unsigned byte_length = 1;
282
283 /* byte_length being the number of bytes of data absorbed so far in
284 turning the leb into a Dwarf_Signed. */
285 if (!outval) {
286 return DW_DLV_ERROR;
287 }
288 if (leb128 >= endptr) {
289 return DW_DLV_ERROR;
290 }
291 byte = *leb128;
292 for (;;) {
The gdb debugging information is as follows:
(gdb)set args POC1
(gdb) r
...
.debug_info
Breakpoint 1, _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60,
outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291
291 byte = *leb128;
(gdb) p leb128
$22 = (Dwarf_Small *) 0x60462c598e45 ""
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x00000000005c5129 in _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60,
outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291
291 byte = *leb128;
(gdb) bt
#0 0x00000000005c5129 in _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60,
outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291
#1 0x000000000060fd38 in _dwarf_get_size_of_val (dbg=0x62400000c100, form=<optimized out>,
cu_version=<optimized out>, address_size=8, val_ptr=0x60462c598e45 "", v_length_size=4,
size_out=<optimized out>, section_end_ptr=<optimized out>, error=<optimized out>) at dwarf_util.c:371
#2 0x000000000060044f in _dwarf_get_value_ptr (die=<optimized out>, attr=18, attr_form=0x7fffffffd3a0,
ptr_to_value=<optimized out>, error=0x7fffffffdb40) at dwarf_query.c:519
#3 0x00000000005ff21b in dwarf_attr (die=<optimized out>, attr=16, ret_attr=0x7fffffffd4c0,
error=0x7fffffffdb40) at dwarf_query.c:614
#4 0x00000000005c6058 in dwarf_srcfiles (die=0x60400000d6e0, srcfiles=0x7fffffffdb20,
srcfilecount=0x7fffffffdb00, error=<optimized out>) at ./dwarf_line.c:326
#5 0x000000000051423e in print_one_die_section (dbg=<optimized out>, is_info=<optimized out>,
pod_err=<optimized out>) at print_die.c:812
#6 0x0000000000511f73 in print_infos (dbg=0x62400000c100, is_info=<optimized out>) at print_die.c:371
#7 0x00000000004f7f09 in process_one_file (l_config_file_data=<optimized out>, elf=<optimized out>,
elftied=<optimized out>, file_name=<optimized out>, tied_file_name=<optimized out>,
archive=<optimized out>) at dwarfdump.c:1293
#8 main (argc=<optimized out>, argv=<optimized out>) at dwarfdump.c:562
Actual results:
crash
Expected results:
crash
Additional info:
This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact ganshuitao and chaoz.cn if you need more info about the team, the tool or the vulnerability.
Created attachment 1292558 [details] Triggered by "dwarfdump POC1" Description of problem: There is a unknown memory access in _dwarf_decode_s_leb128_chk() of dwarfdump. A crafted input will lead to remote denial of service attack. Version-Release number of selected component (if applicable): <= latest version How reproducible: ./dwarfdump $POC Steps to Reproduce: The normal and asan debug information are as follows: $ ./dwarfdump POC1 .debug_info ASAN:DEADLYSIGNAL ================================================================= ==42828==ERROR: AddressSanitizer: SEGV on unknown address 0x60462c598e45 (pc 0x0000005c5129 bp 0x60462c598e45 sp 0x7ffca7481000 T0) #0 0x5c5128 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c5128) #1 0x60fd37 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x60fd37) #2 0x60044e (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x60044e) #3 0x5ff21a (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5ff21a) #4 0x5c6057 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c6057) #5 0x51423d (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x51423d) #6 0x511f72 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x511f72) #7 0x4f7f08 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x4f7f08) #8 0x7f47af33582f (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #9 0x419458 (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x419458) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (/home/icy/real/dwarf-20170416-asan/dwarfdump/dwarfdump+0x5c5128) ==42828==ABORTING The vulnerability was triggered in function int _dwarf_decode_s_leb128_chk() at dwarf_leb.c:291. We don't analyze the reason of the trigger careful, but the 'unknow address' reported by ASAN is readable by gdb. 273 _dwarf_decode_s_leb128_chk(Dwarf_Small * leb128, Dwarf_Word * leb128_length, 274 Dwarf_Signed *outval,Dwarf_Byte_Ptr endptr) 275 { ... 280 /* The byte_length value will be a small non-negative integer. */ 281 unsigned byte_length = 1; 282 283 /* byte_length being the number of bytes of data absorbed so far in 284 turning the leb into a Dwarf_Signed. */ 285 if (!outval) { 286 return DW_DLV_ERROR; 287 } 288 if (leb128 >= endptr) { 289 return DW_DLV_ERROR; 290 } 291 byte = *leb128; 292 for (;;) { The gdb debugging information is as follows: (gdb)set args POC1 (gdb) r ... .debug_info Breakpoint 1, _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60, outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291 291 byte = *leb128; (gdb) p leb128 $22 = (Dwarf_Small *) 0x60462c598e45 "" (gdb) c Continuing. Program received signal SIGSEGV, Segmentation fault. 0x00000000005c5129 in _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60, outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291 291 byte = *leb128; (gdb) bt #0 0x00000000005c5129 in _dwarf_decode_s_leb128_chk (leb128=0x60462c598e45 "", leb128_length=0x7fffffffcf60, outval=0x7fffffffcf80, endptr=0x61300000de1c "") at dwarf_leb.c:291 #1 0x000000000060fd38 in _dwarf_get_size_of_val (dbg=0x62400000c100, form=<optimized out>, cu_version=<optimized out>, address_size=8, val_ptr=0x60462c598e45 "", v_length_size=4, size_out=<optimized out>, section_end_ptr=<optimized out>, error=<optimized out>) at dwarf_util.c:371 #2 0x000000000060044f in _dwarf_get_value_ptr (die=<optimized out>, attr=18, attr_form=0x7fffffffd3a0, ptr_to_value=<optimized out>, error=0x7fffffffdb40) at dwarf_query.c:519 #3 0x00000000005ff21b in dwarf_attr (die=<optimized out>, attr=16, ret_attr=0x7fffffffd4c0, error=0x7fffffffdb40) at dwarf_query.c:614 #4 0x00000000005c6058 in dwarf_srcfiles (die=0x60400000d6e0, srcfiles=0x7fffffffdb20, srcfilecount=0x7fffffffdb00, error=<optimized out>) at ./dwarf_line.c:326 #5 0x000000000051423e in print_one_die_section (dbg=<optimized out>, is_info=<optimized out>, pod_err=<optimized out>) at print_die.c:812 #6 0x0000000000511f73 in print_infos (dbg=0x62400000c100, is_info=<optimized out>) at print_die.c:371 #7 0x00000000004f7f09 in process_one_file (l_config_file_data=<optimized out>, elf=<optimized out>, elftied=<optimized out>, file_name=<optimized out>, tied_file_name=<optimized out>, archive=<optimized out>) at dwarfdump.c:1293 #8 main (argc=<optimized out>, argv=<optimized out>) at dwarfdump.c:562 Actual results: crash Expected results: crash Additional info: This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact ganshuitao and chaoz.cn if you need more info about the team, the tool or the vulnerability.