CVE-2022-43343 描述

N-Prolog v1.91 被发现函数 gettoken()（位于 Main.c）中存在全局缓冲区溢出漏洞。

复现

要复现该漏洞，请下载易受攻击的 N-Prolog 版本（v1.91）并编译项目：

git clone https://github.com/sasagawa888/nprolog.git
cd nprolog
git checkout ae7cc9bf6087cfcb57baadbe59f5005c6dc0f09c
make

编译完成后，我们可以将 N-Prolog 指向本仓库中包含的漏洞利用概念验证文件（CVE-2022-43343_crash）：

./npl -s CVE-2022-43343_crash

上述命令将导致崩溃并返回错误消息：

segmentation fault  ./npl -s CVE-2022-43343_crash

为了更好地了解崩溃发生的位置，我们通过向 Makefile 中的 CFLAGS 和 LIBS 变量添加 -fsanitize=address 来重新编译项目，启用地址消毒器（ASAN）。我们还希望编译器在可执行文件中存储符号表信息（-g 标志），以帮助我们确定产生崩溃的代码行：

CC   = gcc
LIBS = -lm -ldl -fsanitize=address


LIBSRASPI = -lm -ldl -lwiringPi -fsanitize=address -g
INCS =  
CFLAGS = $(INCS) -Wall -O3 -fsanitize=address
DEST = /usr/local/bin

接下来我们清理旧文件并重新编译项目：

make clean
make

以脚本模式针对恶意文件执行 npl：

./npl -s CVE-2022-43343_crash

ASAN 报告对函数 gettoken()（位于 parser.c，第 1022 行）中的全局变量进行了大小为 1 的无效写入：

==291696==ERROR: AddressSanitizer: global-buffer-overflow on address 0x56107f6d54b0 at pc 0x56107f651925 bp 0x7ffc7a408e10 sp 0x7ffc7a408e08
WRITE of size 1 at 0x56107f6d54b0 thread T0
    #0 0x56107f651924 in gettoken /dev/shm/nprolog/parser.c:1022
    #1 0x56107f656924 in parser /dev/shm/nprolog/parser.c:40
    #2 0x56107f6624ca in b_consult /dev/shm/nprolog/builtin.c:1561
    #3 0x56107f642d72 in main /dev/shm/nprolog/main.c:276
    #4 0x7f8c85646189 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
    #5 0x7f8c85646244 in __libc_start_main_impl ../csu/libc-start.c:381
    #6 0x56107f6432c0 in _start (/dev/shm/nprolog/npl+0x162c0)

0x56107f6d54b0 is located 48 bytes to the left of global variable 'record_pt' defined in 'main.c:24:5' (0x56107f6d54e0) of size 4
0x56107f6d54b0 is located 0 bytes to the right of global variable 'stok' defined in 'main.c:27:7' (0x56107f6d53a0) of size 272
SUMMARY: AddressSanitizer: global-buffer-overflow /dev/shm/nprolog/parser.c:1022 in gettoken
Shadow bytes around the buggy address:
  0x0ac28fed2a40: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
  0x0ac28fed2a50: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
  0x0ac28fed2a60: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
  0x0ac28fed2a70: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ac28fed2a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ac28fed2a90: 00 00 00 00 00 00[f9]f9 f9 f9 f9 f9 04 f9 f9 f9
  0x0ac28fed2aa0: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ac28fed2ab0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ac28fed2ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ac28fed2ad0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ac28fed2ae0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==291696==ABORTING

CVE-2022-43343

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CVE-2022-43343 描述

复现

参考