petewarden
catdoc global buffer overflow -- by misuse of the option "-b"
When the program input contains the option of "-b" , the program will cause global buffer overflow error.
Test Environment Ubuntu 20.04, 64 bit catdoc (version: 0.95; )
How to trigger Compile the program with AddressSanitizer Run command $ .catdoc -b $POC Details ASAN report $./catdoc -b $POC
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==928572==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000ddb81e at pc 0x0000004cfcf2 bp 0x7ffd66b3b610 sp 0x7ffd66b3b608
READ of size 2 at 0x000000ddb81e thread T0
#0 0x4cfcf1 in process_file /home/root/FuzzDateset/catdoc/catdoc-0.95/src/reader.c:175:6
#1 0x4d12a2 in analyze_format /home/root/FuzzDateset/catdoc/catdoc-0.95/src/analyze.c:38:10
#2 0x4cd221 in main /home/root/FuzzDateset/catdoc/catdoc-0.95/src/catdoc.c:180:6
#3 0x7fcb6627f082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#4 0x41d44d in _start (/home/root/randomFuzz/catdoc/catdoc/catdoc_a_u_b/catdoc+0x41d44d)
0x000000ddb81e is located 2 bytes to the left of global variable 'buffer' defined in 'reader.c:13:20' (0xddb820) of size 524288
0x000000ddb81e is located 22 bytes to the right of global variable 'output_buffer' defined in 'catdoc.c:26:22' (0xddb800) of size 8
SUMMARY: AddressSanitizer: global-buffer-overflow /home/root/FuzzDateset/catdoc/catdoc-0.95/src/reader.c:175:6 in process_file
Shadow bytes around the buggy address:
0x0000801b36b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b36c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b36d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b36e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b36f0: 00 00 00 00 04 f9 f9 f9 00 f9 f9 f9 00 f9 f9 f9
=>0x0000801b3700: 00 f9 f9[f9]00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b3710: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b3720: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b3730: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b3740: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000801b3750: 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
==928572==ABORTING
The URL of PoC is PoC
Hello, I encountered some issues while reproducing this issue. When the source program ran ./catdoc -b global-buffer-overflow command,The program reported the following error： Cannot load charset cp1251 - file not found
Compile the program with AddressSanitizer, and running the program, still reporting the above error. Do you know what the reason is?
Sorry, I just reproduce this bug again. And I did not encounter the above situation. And I think the reason is about the environment. please provide the relevant execution environment and compilation commands.