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Heap Buffer Overflow when appending certain size string to URL file extension when compiled with ASAN. #17

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ghost opened this issue May 17, 2019 · 2 comments

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commented May 17, 2019

Screen -S Server
./GoHTTP
CTRL-A, D

Screen -S Crash
curl 127.0.0.1:4000/hi.htmlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
CTRL-A, D

ASAN Details:
==9376==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000efbb at pc 0x000000402e44 bp 0x7
ffd9e6f3a70 sp 0x7ffd9e6f3a60
WRITE of size 1 at 0x60200000efbb thread T0
#0 0x402e43 in GetExtension (/root/GoHttp/GoHTTP+0x402e43)
#1 0x40307f in handleHttpGET (/root/GoHttp/GoHTTP+0x40307f)
#2 0x4035b7 in receive (/root/GoHttp/GoHTTP+0x4035b7)
#3 0x4037da in handle (/root/GoHttp/GoHTTP+0x4037da)
#4 0x403881 in acceptConnection (/root/GoHttp/GoHTTP+0x403881)
#5 0x4038db in start (/root/GoHttp/GoHTTP+0x4038db)
#6 0x40406d in main (/root/GoHttp/GoHTTP+0x40406d)
#7 0x7f022305a82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#8 0x401808 in _start (/root/GoHttp/GoHTTP+0x401808)

0x60200000efbb is located 1 bytes to the right of 10-byte region [0x60200000efb0,0x60200000efba)
allocated by thread T0 here:
#0 0x7f02241a9602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x402f2c in handleHttpGET (/root/GoHttp/GoHTTP+0x402f2c)
#2 0x4035b7 in receive (/root/GoHttp/GoHTTP+0x4035b7)
#3 0x4037da in handle (/root/GoHttp/GoHTTP+0x4037da)
#4 0x403881 in acceptConnection (/root/GoHttp/GoHTTP+0x403881)
#5 0x4038db in start (/root/GoHttp/GoHTTP+0x4038db)
#6 0x40406d in main (/root/GoHttp/GoHTTP+0x40406d)
#7 0x7f022305a82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 GetExtension
Shadow bytes around the buggy address:
0x0c047fff9da0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9db0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9de0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9df0: fa fa fa fa fa fa 00[02]fa fa 05 fa fa fa 00 02
0x0c047fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e40: 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
==9376==ABORTING

@fekberg

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commented May 20, 2019

FYI this project isn't maintained. I only wrote it as a part of a university course years ago.

Don't use the code for anything but playing around..

@ghost

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commented May 24, 2019

Closing.

@ghost ghost closed this May 24, 2019

This issue was closed.

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