Headline
CVE-2022-1769: Buffer Over-read in function get_one_sourceline in vim
Buffer Over-read in GitHub repository vim/vim prior to 8.2.4974.
Description
Buffer Over-read in function get_one_sourceline at scriptfile.c:1976
vim version
git log
commit 5a8fad32ea9c075f045b37d6c7739891d458f82b (HEAD -> master, tag: v8.2.4962, origin/master, origin/HEAD)
POC
./vim -u NONE -i NONE -n -m -X -Z -e -s -S /mnt/share/max/fuzz/poc/vim/poc_h6_s.dat -c :qa!
=================================================================
==16909==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61100000603a at pc 0x000000430bd6 bp 0x7fffaeb57dd0 sp 0x7fffaeb57590
READ of size 1 at 0x61100000603a thread T0
#0 0x430bd5 in strlen (/home/fuzz/fuzz/vim/vim/src/vim+0x430bd5)
#1 0xe57851 in get_one_sourceline /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1976:25
#2 0xe550dc in getsourceline /home/fuzz/fuzz/vim/vim/src/scriptfile.c:2097:9
#3 0xe514f9 in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1657:17
#4 0xe4d919 in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1157:6
#5 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
#6 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#7 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#8 0x11503df in call_user_func /home/fuzz/fuzz/vim/vim/src/userfunc.c:2900:2
#9 0x114c4bd in call_user_func_check /home/fuzz/fuzz/vim/vim/src/userfunc.c:3048:2
#10 0x1146844 in call_func /home/fuzz/fuzz/vim/vim/src/userfunc.c:3612:11
#11 0x1143bef in get_func_tv /home/fuzz/fuzz/vim/vim/src/userfunc.c:1833:8
#12 0x11764b6 in ex_call /home/fuzz/fuzz/vim/vim/src/userfunc.c:5513:6
#13 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#14 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#15 0xe5191c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
#16 0xe4e376 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
#17 0xe4dcac in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
#18 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
#19 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#20 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#21 0x7c8f31 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
#22 0x1419502 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3108:2
#23 0x141569b in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
#24 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
#25 0x7f6a7372b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#26 0x41ea6d in _start (/home/fuzz/fuzz/vim/vim/src/vim+0x41ea6d)
0x61100000603a is located 0 bytes to the right of 250-byte region [0x611000005f40,0x61100000603a)
allocated by thread T0 here:
#0 0x499fe9 in realloc (/home/fuzz/fuzz/vim/vim/src/vim+0x499fe9)
#1 0x4ccc44 in ga_grow_inner /home/fuzz/fuzz/vim/vim/src/alloc.c:753:10
#2 0x4cc8a5 in ga_grow /home/fuzz/fuzz/vim/vim/src/alloc.c:718:9
#3 0xe570fa in get_one_sourceline /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1956:6
#4 0xe550dc in getsourceline /home/fuzz/fuzz/vim/vim/src/scriptfile.c:2097:9
#5 0xe514f9 in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1657:17
#6 0xe4d919 in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1157:6
#7 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
#8 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#9 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#10 0x11503df in call_user_func /home/fuzz/fuzz/vim/vim/src/userfunc.c:2900:2
#11 0x114c4bd in call_user_func_check /home/fuzz/fuzz/vim/vim/src/userfunc.c:3048:2
#12 0x1146844 in call_func /home/fuzz/fuzz/vim/vim/src/userfunc.c:3612:11
#13 0x1143bef in get_func_tv /home/fuzz/fuzz/vim/vim/src/userfunc.c:1833:8
#14 0x11764b6 in ex_call /home/fuzz/fuzz/vim/vim/src/userfunc.c:5513:6
#15 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#16 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#17 0xe5191c in do_source_ext /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1674:5
#18 0xe4e376 in do_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1801:12
#19 0xe4dcac in cmd_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1174:14
#20 0xe4d38e in ex_source /home/fuzz/fuzz/vim/vim/src/scriptfile.c:1200:2
#21 0x7d7529 in do_one_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:2567:2
#22 0x7c42e5 in do_cmdline /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:992:17
#23 0x7c8f31 in do_cmdline_cmd /home/fuzz/fuzz/vim/vim/src/ex_docmd.c:586:12
#24 0x1419502 in exe_commands /home/fuzz/fuzz/vim/vim/src/main.c:3108:2
#25 0x141569b in vim_main2 /home/fuzz/fuzz/vim/vim/src/main.c:780:2
#26 0x140ad95 in main /home/fuzz/fuzz/vim/vim/src/main.c:432:12
#27 0x7f6a7372b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/fuzz/fuzz/vim/vim/src/vim+0x430bd5) in strlen
Shadow bytes around the buggy address:
0x0c227fff8bb0: 00 00 00 00 00 00 00 02 fa fa fa fa fa fa fa fa
0x0c227fff8bc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c227fff8bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02
0x0c227fff8be0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c227fff8bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c227fff8c00: 00 00 00 00 00 00 00[02]fa fa fa fa fa fa fa fa
0x0c227fff8c10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8c20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8c30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8c40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8c50: 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
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
==16909==ABORTING
poc_h6_s.dat
Impact
This vulnerabilities are capable of crashing software, Modify Memory, and possible remote execution
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