Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

A NULL pointer dereference in the function nasm_parser_directive() modules/parsers/nasm/nasm-parse.c:1596 #167

Open
Clingto opened this issue May 19, 2021 · 0 comments

Comments

@Clingto
Copy link

Clingto commented May 19, 2021

System info:
Ubuntu 16.04.6 LTS, X64, gcc 5.4.0, yasm (latest master 009450c)
Compile Command:

$ ./autogen.sh
make distclean

CC=gcc CXX=g++ CFLAGS="-fsanitize=address -fno-omit-frame-pointer -g" CXXFLAGS="-fsanitize=address -fno-omit-frame-pointer -g" ./configure --prefix=$PWD/build --disable-shared
make -j
make install

Run Command:

$ yasm  $POC

POC file:
https://github.com/Clingto/POC/blob/master/MSA/yasm/yasm-1595-nasm_parser_directive-null-pointer-deref

ASAN info:

yasm: file name already has no extension: output will be in `yasm.out'
ASAN:SIGSEGV
=================================================================
==13148==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f3a60e8fbb7 bp 0x7fff5f933810 sp 0x7fff5f933720 T0)
    #0 0x7f3a60e8fbb6 in nasm_parser_directive  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:1596
    #1 0x7f3a60e9bd3c in parse_line  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:377
    #2 0x7f3a60e9bd3c in nasm_parser_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:231
    #3 0x7f3a60e8f36b in nasm_do_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:66
    #4 0x7f3a60e8f36b in nasm_parser_do_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:83
    #5 0x402c84 in do_assemble  test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:521
    #6 0x402c84 in main  test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:753
    #7 0x7f3a6405182f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #8 0x403ee8 in _start ( test/yasm-uaf/bin_asan/bin/yasm+0x403ee8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:1596 nasm_parser_directive
==13148==ABORTING
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

1 participant