Public bug reported:
# enviroment
ubuntu 18.04
./jhead poc
# version
3.04
# asan out
=================================================================
==27663==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x61d000000a08 at pc 0x562527b27ea8 bp 0x7ffe2a994bb0 sp 0x7ffe2a994ba0
READ of size 1 at 0x61d000000a08 thread T0
#0 0x562527b27ea7 in ProcessGpsInfo gpsinfo.c:126
#1 0x562527b194d5 in ProcessExifDir exif.c:866
#2 0x562527b1a95a in process_EXIF exif.c:1041
#3 0x562527b06382 in ReadJpegSections jpgfile.c:287
#4 0x562527b0790e in ReadJpegSections jpgfile.c:126
#5 0x562527b0790e in ReadJpegFile jpgfile.c:379
#6 0x562527afd66c in ProcessFile jhead.c:905
#7 0x562527af8b2e in main jhead.c:1756
#8 0x7f3c2ea7fbf6 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
#9 0x562527afb279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)
0x61d000000a08 is located 66 bytes to the right of 2374-byte region
[0x61d000000080,0x61d0000009c6)
allocated by thread T0 here:
#0 0x7f3c2f2cbb40 in __interceptor_malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
#1 0x562527b04d6b in ReadJpegSections jpgfile.c:173
SUMMARY: AddressSanitizer: heap-buffer-overflow gpsinfo.c:126 in ProcessGpsInfo
Shadow bytes around the buggy address:
0x0c3a7fff80f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3a7fff8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3a7fff8110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3a7fff8120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3a7fff8130: 00 00 00 00 00 00 00 00 06 fa fa fa fa fa fa fa
=>0x0c3a7fff8140: fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff8150: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff8160: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff8170: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff8190: 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
==27663==ABORTING
** Affects: jhead (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "poc5"
https://bugs.launchpad.net/bugs/1921305/+attachment/5480703/+files/poc5
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https://bugs.launchpad.net/bugs/1921305
Title:
heap overflow
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