Headline
CVE-2022-2206: Out-of-bound read in function msg_outtrans_attr in vim
Out-of-bounds Read in GitHub repository vim/vim prior to 8.2.
Description
Out-of-bound read in function msg_outtrans_attr at message.c:1551
Version
commit 8eba2bd291b347e3008aa9e565652d51ad638cfa (HEAD -> master, tag: v8.2.5151)
Proof of Concept
./vim/src/vim -u NONE -i NONE -n -m -X -Z -e -s -S poc_vim01 -c :qa!
=================================================================
==21232==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x619000000981 at pc 0x7faf43c4f66e bp 0x7ffd3a3d8b10 sp 0x7ffd3a3d82b8
READ of size 620 at 0x619000000981 thread T0
#0 0x7faf43c4f66d (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x5166d)
#1 0x562f077dacc5 in msg_outtrans_attr /home/guest/trung/vim/src/message.c:1551
#2 0x562f077d4777 in msg_attr_keep /home/guest/trung/vim/src/message.c:176
#3 0x562f077d4550 in msg_attr /home/guest/trung/vim/src/message.c:123
#4 0x562f077d7aec in msg_trunc_attr /home/guest/trung/vim/src/message.c:933
#5 0x562f072d8239 in process_next_cpt_value /home/guest/trung/vim/src/insexpand.c:3271
#6 0x562f072daed2 in ins_compl_get_exp /home/guest/trung/vim/src/insexpand.c:3743
#7 0x562f072dbba5 in find_next_completion_match /home/guest/trung/vim/src/insexpand.c:3992
#8 0x562f072dbf6e in ins_compl_next /home/guest/trung/vim/src/insexpand.c:4093
#9 0x562f072df01d in ins_complete /home/guest/trung/vim/src/insexpand.c:4944
#10 0x562f0713b591 in edit /home/guest/trung/vim/src/edit.c:1281
#11 0x562f073ac613 in invoke_edit /home/guest/trung/vim/src/normal.c:7035
#12 0x562f073a7135 in n_opencmd /home/guest/trung/vim/src/normal.c:6279
#13 0x562f073aeb89 in nv_open /home/guest/trung/vim/src/normal.c:7416
#14 0x562f073843de in normal_cmd /home/guest/trung/vim/src/normal.c:939
#15 0x562f0720b759 in exec_normal /home/guest/trung/vim/src/ex_docmd.c:8812
#16 0x562f0720b535 in exec_normal_cmd /home/guest/trung/vim/src/ex_docmd.c:8775
#17 0x562f0720add6 in ex_normal /home/guest/trung/vim/src/ex_docmd.c:8693
#18 0x562f071e76d6 in do_one_cmd /home/guest/trung/vim/src/ex_docmd.c:2570
#19 0x562f071dea5c in do_cmdline /home/guest/trung/vim/src/ex_docmd.c:992
#20 0x562f074ff9cb in do_source_ext /home/guest/trung/vim/src/scriptfile.c:1674
#21 0x562f07500b0d in do_source /home/guest/trung/vim/src/scriptfile.c:1801
#22 0x562f074fd646 in cmd_source /home/guest/trung/vim/src/scriptfile.c:1174
#23 0x562f074fd6a7 in ex_source /home/guest/trung/vim/src/scriptfile.c:1200
#24 0x562f071e76d6 in do_one_cmd /home/guest/trung/vim/src/ex_docmd.c:2570
#25 0x562f071dea5c in do_cmdline /home/guest/trung/vim/src/ex_docmd.c:992
#26 0x562f071dce5b in do_cmdline_cmd /home/guest/trung/vim/src/ex_docmd.c:586
#27 0x562f077cda63 in exe_commands /home/guest/trung/vim/src/main.c:3133
#28 0x562f077c6c58 in vim_main2 /home/guest/trung/vim/src/main.c:780
#29 0x562f077c6514 in main /home/guest/trung/vim/src/main.c:432
#30 0x7faf42e5ac86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
#31 0x562f07068a99 in _start (/home/guest/trung/vim/src/vim+0x137a99)
0x619000000981 is located 0 bytes to the right of 1025-byte region [0x619000000580,0x619000000981)
allocated by thread T0 here:
#0 0x7faf43cdcb40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
#1 0x562f07068edf in lalloc /home/guest/trung/vim/src/alloc.c:246
#2 0x562f07068ce4 in alloc /home/guest/trung/vim/src/alloc.c:151
#3 0x562f077c6e7c in common_init /home/guest/trung/vim/src/main.c:914
#4 0x562f077c6222 in main /home/guest/trung/vim/src/main.c:185
#5 0x7faf42e5ac86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x5166d)
Shadow bytes around the buggy address:
0x0c327fff80e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff80f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c327fff8130:[01]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8140: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8180: 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
==21232==ABORTING
Attachment
poc_vim01
Impact
This may result in corruption of sensitive information, a crash, or code execution among other things.
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