Headline
CVE-2021-42196: A NULL pointer dereference exists in the function traits_parse in abc.c · Issue #172 · matthiaskramm/swftools
An issue was discovered in swftools through 20201222. A NULL pointer dereference exists in the function traits_parse() located in abc.c. It allows an attacker to cause Denial of Service.
system info
Ubuntu x86_64, clang 6.0, swfdump (latest master a9d5082)
Command line
./src/swfdump -D @@
AddressSanitizer output
==47344==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000030 (pc 0x000000488d17 bp 0x000000000000 sp 0x7fffffffdd20 T0)
#0 0x488d16 in traits_parse as3/abc.c:482
#1 0x495d41 in swf_ReadABC as3/abc.c:946
#2 0x409045 in main /test/swftools-asan/src/swfdump.c:1577
#3 0x7ffff68a683f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
#4 0x40c168 in _start (/test/swftools-asan/src/swfdump+0x40c168)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV as3/abc.c:482 traits_parse
==47344==ABORTING
POC
traits_parse_poc