Public bug reported:
When compiling mksh with ASAN and running [[ -v $XX ]] ($XX being an
undefined environment variable) mksh will crash.
$ echo $KSH_VERSION
@(#)MIRBSD KSH R57 2019/03/01
$ set | grep XX=
$ [[ -v $XX ]]
=================================================================
==362==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xf4d024d5 at
pc 0x56763b99 bp 0xff8cc988 sp 0xff8cc978
READ of size 1 at 0xf4d024d5 thread T0
#0 0x56763b98 (/usr/bin/mksh+0x193b98)
0xf4d024d5 is located 0 bytes to the right of 5-byte region
[0xf4d024d0,0xf4d024d5)
allocated by thread T0 here:
#0 0xf7a285bd in __interceptor_realloc
(/lib/i386-linux-gnu/libasan.so.5+0x1125bd)
#1 0x565e115d (/usr/bin/mksh+0x1115d)
SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/bin/mksh+0x193b98)
Shadow bytes around the buggy address:
0x3e9a0440: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0450: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0460: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0470: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0480: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x3e9a0490: fa fa fa fa fa fa fa fa fa fa[05]fa fa fa fd fa
0x3e9a04a0: fa fa fd fa fa fa 00 fa fa fa 00 00 fa fa 00 01
0x3e9a04b0: fa fa 00 04 fa fa 00 01 fa fa fd fd fa fa fd fa
0x3e9a04c0: fa fa 07 fa fa fa fd fa fa fa fd fa fa fa fd fd
0x3e9a04d0: fa fa 00 fa fa fa fd fa fa fa fa fa fa fa fa fa
0x3e9a04e0: 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
==362==ABORTING
** Affects: mksh
Importance: Undecided
Status: New
** Tags: crash fuzzing
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https://bugs.launchpad.net/bugs/1857826
Title:
mksh ASAN heap-buffer-overflow
Status in mksh:
New
Bug description:
When compiling mksh with ASAN and running [[ -v $XX ]] ($XX being an
undefined environment variable) mksh will crash.
$ echo $KSH_VERSION
@(#)MIRBSD KSH R57 2019/03/01
$ set | grep XX=
$ [[ -v $XX ]]
=================================================================
==362==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xf4d024d5 at
pc 0x56763b99 bp 0xff8cc988 sp 0xff8cc978
READ of size 1 at 0xf4d024d5 thread T0
#0 0x56763b98 (/usr/bin/mksh+0x193b98)
0xf4d024d5 is located 0 bytes to the right of 5-byte region
[0xf4d024d0,0xf4d024d5)
allocated by thread T0 here:
#0 0xf7a285bd in __interceptor_realloc
(/lib/i386-linux-gnu/libasan.so.5+0x1125bd)
#1 0x565e115d (/usr/bin/mksh+0x1115d)
SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/bin/mksh+0x193b98)
Shadow bytes around the buggy address:
0x3e9a0440: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0450: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0460: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0470: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x3e9a0480: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x3e9a0490: fa fa fa fa fa fa fa fa fa fa[05]fa fa fa fd fa
0x3e9a04a0: fa fa fd fa fa fa 00 fa fa fa 00 00 fa fa 00 01
0x3e9a04b0: fa fa 00 04 fa fa 00 01 fa fa fd fd fa fa fd fa
0x3e9a04c0: fa fa 07 fa fa fa fd fa fa fa fd fa fa fa fd fd
0x3e9a04d0: fa fa 00 fa fa fa fd fa fa fa fa fa fa fa fa fa
0x3e9a04e0: 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
==362==ABORTING
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