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Bug: heap-buffer-overflow in function _nc_find_entry
From: |
address@hidden |
Subject: |
Bug: heap-buffer-overflow in function _nc_find_entry |
Date: |
Fri, 11 Oct 2019 16:59:52 +0800 |
POC: https://github.com/zjuchenyuan/fuzzpoc/raw/master/infotocap_poc6
```
# /tmp/infotocap fuzzpoc/infotocap_poc6
=================================================================
==7==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x625000012090 at pc 0x00000044c698 bp 0x7fffffffb9f0 sp 0x7fffffffb9e0
READ of size 8 at 0x625000012090 thread T0
#0 0x44c697 in _nc_find_entry ../ncurses/./tinfo/comp_hash.c:70
#1 0x42daad in nametrans ../progs/dump_entry.c:174
#2 0x405c1c in put_translate ../progs/tic.c:339
#3 0x405c1c in main ../progs/tic.c:1033
#4 0x7ffff6ac082f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#5 0x408cd8 in _start (/tmp/infotocap+0x408cd8)
AddressSanitizer can not describe address in more detail (wild memory access suspected).
SUMMARY: AddressSanitizer: heap-buffer-overflow ../ncurses/./tinfo/comp_hash.c:70 _nc_find_entry
Shadow bytes around the buggy address:
0x0c4a7fffa3c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa3d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa3e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa3f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c4a7fffa410: fa fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa420: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa430: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa440: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa450: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c4a7fffa460: fa fa fa fa 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
==7==ABORTING
```
Reproducible Docker image has been pushed to `zjuchenyuan/dockerized_poc:ncurses`, Dockerfile:
```
FROM zjuchenyuan/afl
ENV AFL_USE_ASAN=1 ASAN_OPTIONS="detect_leaks=0"
RUN git clone https://github.com/ThomasDickey/ncurses-snapshots &&\
cd ncurses-snapshots &&\
git checkout 8805e9e &&\
./configure --disable-shared &&\
make -j &&\
cp ./progs/tic /tmp/infotocap
RUN git clone https://github.com/zjuchenyuan/fuzzpoc
RUN /tmp/infotocap fuzzpoc/infotocap_poc6 || exit 0
```
- Bug: heap-buffer-overflow in function _nc_find_entry,
address@hidden <=