Crashes saved aren't really crashes

[Techno-Fox]

Hello. It's me again. So after letting pdfcrack fuzz. I wanted to analyze the crashes. However as it turns out. They weren't even crashes. When I looked pdfcrack gives an error about them not being save files (pdfcrack has save file feature I used to make go by faster). Sure an error, but no a crash.

It also let this fuzz overnight. It took up over 200GB by logging manul though to be crashes.

I'll upload the file so you can test this.

pdfcrack_fuzz.zip

Recreate Issue :

Just run the command
manul.py -i in2 -o out -n 3 -c pdfcrack_manul.config "pdfcrack_scource/pdfcrack -l @@"

The pdfcrack is already instrumented. When you have fuzzed as much as you want. Then you can run. pdfcrack_source/pdfcrack -l <a .sav in out>, and it should tell you that this is not a save or is corrupted, not crash.

[Techno-Fox]

Just to make sure. I tested this with AFL. Went throught the crashes using afl-collect (part of afl-utils), and found a heap error (which is exploitable).

afl-collect 1.33a by rc0r hlt99@blinkenshell.org # @_rc0r
Crash sample collection and processing utility for afl-fuzz.

[] Going to collect crash samples from '/home/kittytechno/fuzzing/pdfcrack/out_afl'.
[!] Table 'Data' not found in existing database!
[] Creating new table 'Data' in database '/home/kittytechno/fuzzing/pdfcrack/crashes.db' to store data!
[] Found 1 fuzzers, collecting crash samples.
[] Successfully indexed 6 crash samples.
[] Saving invalid sample info to database.
[!] Removed 0 invalid crash samples from index.
[!] Removed 0 timed out samples from index.
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.0' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.1' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.2' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.3' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.4' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.5' for 1 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.6' for 0 samples...
[] Generating intermediate gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script.7' for 0 samples...
[] Executing gdb+exploitable script 'gdb_script.0'...
[] Executing gdb+exploitable script 'gdb_script.1'...
[] Executing gdb+exploitable script 'gdb_script.2'...
[] Executing gdb+exploitable script 'gdb_script.3'...
[] Executing gdb+exploitable script 'gdb_script.4'...
[] Executing gdb+exploitable script 'gdb_script.5'...
[] Executing gdb+exploitable script 'gdb_script.6'...
[*] Executing gdb+exploitable script 'gdb_script.7'...
*** GDB+EXPLOITABLE SCRIPT OUTPUT ***
[00001] out_afl:id:000000,sig:11,src:000001,op:flip1,pos:119............: PROBABLY_EXPLOITABLE [DestAvNearNull (15/22)]
[00002] out_afl:id:000001,sig:11,src:000001,op:flip1,pos:391............: PROBABLY_EXPLOITABLE [SegFaultOnPcNearNull (12/22)]
[00003] out_afl:id:000002,sig:06,src:000029+000005,op:splice,rep:2......: EXPLOITABLE [HeapError (10/22)]
[00004] out_afl:id:000003,sig:11,src:000029+000048,op:splice,rep:4......: PROBABLY_EXPLOITABLE [SegFaultOnPcNearNull (12/22)]
[00005] out_afl:id:000004,sig:11,src:000029+000041,op:splice,rep:2......: PROBABLY_EXPLOITABLE [SegFaultOnPcNearNull (12/22)]
[00006] out_afl:id:000005,sig:11,src:000036+000021,op:splice,rep:16.....: PROBABLY_EXPLOITABLE [DestAvNearNull (15/22)]

---

[] Saving sample classification info to database.
[!] Removed 3 duplicate samples from index. Will continue with 3 remaining samples.
[!] Removed 0 uninteresting crash samples from index.
[] Generating final gdb+exploitable script '/home/kittytechno/fuzzing/pdfcrack/collection_dir/gdb_script' for 3 samples...
[*] Copying 3 samples into output directory...

[Techno-Fox]

Any reports?