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Date: Mon, 01 Oct 2012 03:27:05 +0400
From: Alexander Cherepanov <cherepan@...me.ru>
To: john-dev@...ts.openwall.com
Subject: Re: Static analysis of John using Coverity

On 2012-09-19 20:44, jfoug wrote:
> I am going to add these to the wiki, as known crashed.

Thanks!

> It will be 'linked'
> on the wish list page, but I will simply create a full page for this.  Post
> more (unique ones), 

I don't think that different unique crashers are interesting in many
cases. In most cases valid() is almost absent and get_salt() will crash
on every step, overfull all buffers etc. Crashers which looks like a tag
plus several zeros usually point to such cases.

But there are accurate formats (like salted-sha1) where crashes are
results of bugs, sometimes subtle bugs.

> that you know cause a format to pass valid, but are not
> valid, and cause crashes, buffer over flows, etc.

Ok, here are several more:

$WoWSRP$0000000000000000000000000000000000000000000000000000000000000000$0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000*
$mskrb5$$$xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx$xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
{SSHA}========================================
$o5logon$0000

And now several variations which crash *2john programs or pass through
them and then crash john:

----------------------------------------------------------------------
agilekeychain

$ mkdir -p data/default
$ printf '{"list": [{"identifier": "", "level": "", "data":
"%010000d\u0000", "validation": "\u0000", "iterations": 0}]}' >
data/default/encryptionKeys.js
$ ../run/agilekc2john.py . > agilekeychain.john
$ ../run/john agilekeychain.john
Loaded 1 password hash (1Password Agile Keychain PBKDF2-HMAC-SHA-1 AES
[32/64])
Segmentation fault

----------------------------------------------------------------------
dmg

$ make dmg2john

$ perl -C0 -e 'print pack "a*x48Q>", "encrcdsa", -1' > test.dmg
$ ../run/dmg2john test.dmg
Segmentation fault

$ perl -C0 -e 'print pack "a*x48Q>x44Nx136", "encrcdsa", 4097, -1' >
test.dmg
$ ../run/dmg2john test.dmg > dmg.john
$ ../run/john dmg.john
Segmentation fault

----------------------------------------------------------------------
encfs

$ echo
'<root><keySize>a</keySize><kdfIterations>a</kdfIterations><name>a</name><saltData>AAAA</saltData><saltLen>10000</saltLen><encodedKeySize>a</encodedKeySize><encodedKeyData>AAAA</encodedKeyData></root>'
> .encfs6.xml
$ ../run/encfs2john.py . > encfs.john
$ ../run/john encfs.john
Segmentation fault

----------------------------------------------------------------------
ike

$ perl -le 'print(("0" x 6000 . "*") x 10)' > test.ike
$ ../run/ikescan2john.py test.ike > ike.john
$ ../run/john ike.john
Segmentation fault

----------------------------------------------------------------------
keepass

$ perl -C0 -e 'print pack "V3Cv", 0x9AA2D903, 0xB54BFB67, 0, 6, 0' >
test.keepass
$ ../run/keepass2john test.keepass
Segmentation fault

$ perl -C0 -e 'print pack "V3CvQCva32", 0x9AA2D903, 0xB54BFB67, 0, 6, 8,
-1, 0, 0' > test.keepass
$ ../run/keepass2john test.keepass > keepass.john
$ ../run/john keepass.john
Segmentation fault

----------------------------------------------------------------------
keyring

$ gcc -Wall keyring2john.c -o ../run/keyring2john

$ perl -C0 -e 'print pack "a*x4Na10000", "GnomeKeyring\n\r\0\n", 10000'
> test.keyring
$ ../run/keyring2john test.keyring
Segmentation fault

----------------------------------------------------------------------
krb5-18

$ perl -le 'printf "\@...n18,%s", "x" x 300, "0" x 64' > test.kdcdump
$ ../run/kdcdump2john.py test.kdcdump > krb5-18.john
$ ../run/john krb5-18.john
Loaded 1 password hash (KRB5 aes256-cts-hmac-sha1-96 [32/64])
Segmentation fault

----------------------------------------------------------------------
pbkdf2-hmac-sha512

$ perl -e 'print
"<plist><dict><key>SALTED-SHA512-PBKDF2</key><dict><key>entropy</key><data>"
. "A" x 256 . "</data><key>salt</key><data>" . "A" x 1000 .
"</data><key>iterations</key><integer>1</integer></dict></dict></plist>"' >
salt.tmp
$ (echo -n '<plist><dict><key>ShadowHashData</key><array><data>'; plutil
-i salt.tmp | base64; echo -n '</data></array></dict></plist>') > hash.tmp
$ plutil -i hash.tmp > test.plist
$ ../run/ml2john.py test.plist > ml.john
$ ../run/john ml.john
Loaded 1 password hash (GRUB2 / OS X 10.8 pbkdf2-hmac-sha512
[PBKDF2-SHA512 CPU])
Segmentation fault

----------------------------------------------------------------------
pkzip

$ perl -C0 -e 'print pack "Vx22va10000", 0x04034b50, -1' > test.zip
$ ../run/zip2john test.zip
Error, in fread of file data!
Segmentation fault

----------------------------------------------------------------------
racf

$ perl -le 'print "A" x 100, " x x x"' > test.cracf
$ ../run/cracf2john.py test.cracf > racf.john
$ ../run/john racf.john
Loaded 1 password hash (RACF DES [32/64])
Segmentation fault

----------------------------------------------------------------------
salted-sha1

$ echo -e 'uid: a\nuserPassword:
{SSHA}========================================\n\n' > test.ldif
$ ../run/ldif2john.pl test.ldif > ssha.john
$ ../run/john ssha.john
Segmentation fault

----------------------------------------------------------------------
wpapsk

$  for i in $(seq 0 255); do perl -C0 -e "print chr($i) x 0x188" >
test.hccap; ../run/hccap2john test.hccap; done > hccap.john
$ ../run/john hccap.john
Segmentation fault

  Exact hash on which john crashes depends on details of the build etc.

----------------------------------------------------------------------

-- 
Alexander Cherepanov

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