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Hikari4469FC7DCED-A7BB-4479-9718-F956DF20F612HistoryMar 27, 2023 - 2:30 a.m.
heap-buffer-overflow in vim_regsub_both
2023-03-2702:30:15
hikari446
www.huntr.dev
8
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
0.001 Low
EPSS
Percentile
19.4%
Description
heap based buffer overflow in in vim_regsub_both at regexp.c:2473
Vim Version
git log
commit 1a08a3e2a584889f19b84a27672134649b73da58 (HEAD -> master, tag: v9.0.1429, origin/master, origin/HEAD)
Proof of Concept
./vim -u NONE -i NONE -n -m -X -Z -e -s -S POC_vim_regsub_both -c :qa!
=================================================================
==559305==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60600000bc37 at pc 0x55e89c179cab bp 0x7ffdc3294b40 sp 0x7ffdc3294b30
WRITE of size 1 at 0x60600000bc37 thread T0
#0 0x55e89c179caa in vim_regsub_both /home/Desktop/Fuzz/vim/src/regexp.c:2473
#1 0x55e89c258b76 in vim_regsub_multi /home/Desktop/Fuzz/vim/src/regexp.c:1964
#2 0x55e89bb81212 in ex_substitute /home/Desktop/Fuzz/vim/src/ex_cmds.c:4647
#3 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#4 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#5 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#6 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#7 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#8 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#9 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#10 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#11 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#12 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#13 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#14 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#15 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#16 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#17 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#18 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#19 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#20 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#21 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#22 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#23 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#24 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#25 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#26 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#27 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#28 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#29 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#30 0x55e89c2d321b in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1233
#31 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#32 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#33 0x55e89c2cc655 in do_source_ext /home/Desktop/Fuzz/vim/src/scriptfile.c:1759
#34 0x55e89c2d2f20 in do_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1905
#35 0x55e89c2d2f20 in cmd_source /home/Desktop/Fuzz/vim/src/scriptfile.c:1250
#36 0x55e89bbf5094 in do_one_cmd /home/Desktop/Fuzz/vim/src/ex_docmd.c:2580
#37 0x55e89bbf5094 in do_cmdline /home/Desktop/Fuzz/vim/src/ex_docmd.c:993
#38 0x55e89c92eb91 in exe_commands /home/Desktop/Fuzz/vim/src/main.c:3150
#39 0x55e89c92eb91 in vim_main2 /home/Desktop/Fuzz/vim/src/main.c:782
#40 0x55e89b829457 in main /home/Desktop/Fuzz/vim/src/main.c:433
#41 0x7f3f1299ed8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
#42 0x7f3f1299ee3f in __libc_start_main_impl ../csu/libc-start.c:392
#43 0x55e89b830104 in _start (/home/Desktop/Fuzz/vim/src/vim+0x19d104)
0x60600000bc37 is located 3 bytes to the right of 52-byte region [0x60600000bc00,0x60600000bc34)
allocated by thread T0 here:
#0 0x7f3f13438867 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x55e89b83065a in lalloc /home/Desktop/Fuzz/vim/src/alloc.c:246
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/Desktop/Fuzz/vim/src/regexp.c:2473 in vim_regsub_both
Shadow bytes around the buggy address:
0x0c0c7fff9730: fd fd fd fa fa fa fa fa fd fd fd fd fd fd fd fa
0x0c0c7fff9740: fa fa fa fa fd fd fd fd fd fd fd fa fa fa fa fa
0x0c0c7fff9750: fd fd fd fd fd fd fd fa fa fa fa fa fd fd fd fd
0x0c0c7fff9760: fd fd fd fa fa fa fa fa fd fd fd fd fd fd fd fa
0x0c0c7fff9770: fa fa fa fa 00 00 00 00 00 00 00 00 fa fa fa fa
=>0x0c0c7fff9780: 00 00 00 00 00 00[04]fa fa fa fa fa fa fa fa fa
0x0c0c7fff9790: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0c7fff97a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0c7fff97b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0c7fff97c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0c7fff97d0: 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
==559305==ABORTING
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7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
0.001 Low
EPSS
Percentile
19.4%
Related for 9FC7DCED-A7BB-4479-9718-F956DF20F612