6.5 KiB
OpenIPC Wiki
Access to SSH, telnet, FTP and other services
Very often stock firmware provides access to its operating system but the access is closed with an undisclosed password. We can recover a cryptographic hash of that password while extracting a copy of the firmware image.
Password hash
$1$bh2njiGH$4duacOMcXDh6myANzbZTf.
The hashed salt password string consists of three parts: hashing algorithm
identifier, salt and password hash, each of which is preceded by a dollar sign.
The first part, $1, is the hashing algorithm encoded with one (rarely two)
characters. It denotes the cryptographic method used to generate the hash:
$1- MD5 algorithm.$2- Blowfish algorithm.$2a- eksblowfish algorithm$5- SHA-256 algorithm$6- SHA-512 algorithm
The second part, $bh2njiGH, is a salt - a character string added to the
plaintext password before hashing it in order to randomize the resulting hashes
for the same password and prevent rainbow table attacks.
The last part, $4duacOMcXDh6myANzbZTf., is the hash. When you enter a
password, it is concatinated with the provided salt then hashed using the
provided hashing algorithm and the result is compared to the hash.
Same password, salt and hashing method will always produce the same result.
Hashing algorithms are one-way encryption methods meaning the hash cannot be decrypted back to a plaintext password, but it is possible to perform hashing of available variants of plaintext passwords until the match is found. This method is called the brute-force attack.
IP cameras tend to utilize a relatively simple and fast MD5 hashing algorithm so using a password-breaking software and powerful computing resources the original plaintext password can be picked in a matter of weeks or days, if not hours, especially using high-quality dictionaries.
In the example above we used password "openipc". You can check the validity of
the password using either mkpasswd or openssl:
$ mkpasswd -m md5crypt -S bh2njiGH openipc
$1$bh2njiGH$4duacOMcXDh6myANzbZTf.
$ openssl passwd -1 -salt bh2njiGH openipc
$1$bh2njiGH$4duacOMcXDh6myANzbZTf.
When the password is found, it is wise to share it publicly, so that other researchers in the field could dedicate their cryptographic resources to discover even more yet unknown passwords. Sharing is caring, boys!
Some passwords that we found in different firmware
| Hash | Plain text |
|---------------------------------------|------------|
| $1$MoCJ1nRA$NfsI1wlYcWoF5MbU4t3Og0 | ivdev |
| $1$ZebZnWdY$QZ1Aa.7hwBshCS5k40MUE1 | xc12345 |
| $1$d3VPdE0x$Ztn09cyReJy5Pyn | runtop10 |
| $1$qFa2kfke$vJob19l64Q6n8FvP8/kvJ0 | wabjtam |
| $1$rHWQwR5V$i4FVDvwhuzau8msvAfHEt. | 2601hx |
| $1$tiaLlxGM$byeTUfQgqyET5asfwwNjg0 | hichiphx |
| $1$0Me7S3z5$.uQ4Pr/QjJQ/0JUZI0w4m. | |
| $1$4dAkkeWK$HCy0K1z8E.wAuwgLV8bWd/ | |
| $1$7bfnUEjV$3ogadpYTDXtJPV4ubVaGq1 | |
| $1$7BqzlCqK$nQXIfc53c1ACEwzNg7G3D. | |
| $1$cNGGWwI/$5/mZTMlcVfJlpE5DGrdsl/ | |
| $1$FMNq4QIj$lJg6WzZxy1HWl3sL.YwIq1 | |
| $1$IZfqary9$IrG6loat5pDTBLr6ksKTD0 | |
| $1$ocmTTAhE$v.q2/jwr4BS.20KYshYQZ1 | |
| $1$OIKWDzOV$WjZNcNtHSKVscbi9WQcpu/ | |
| $1$rnjbbPTD$tR9oAIWgUp/jRrhjDuUwp0 | |
| $1$RYIwEiRA$d5iRRVQ5ZeRTrJwGjRy.B0 | |
| $1$uF5XC.Im$8k0Gkw4wYaZkNzuOuySIx/ | |
| $1$vN9F.lHa$E09mbCRo70834AUfkytpX | |
| $1$wbAnPk8f$yz0PI9vnyLRmWbENUnce3/ | |
| $1$ybdHbPDn$ii9aEIFNiolBbM9QxW9mr0 | |
| $1$yq01TaSp$lkN/azu3IxE97owy27pve. | |
| $1$yFuJ6yns$33Bk0I91Ji0QMujkR/DPi1 | |
| $1$yi$FS7W5j1RJmbRHDe0El/zX/ | |
| $1$yi$MiivC6pLdwS0zp0pa0cUq1 | qw1234qw |
| $Dg.cUjtWGTIVkuFS0ZYbN1 | fx1805 |
| $enWsv2cbxPCrd0WeXUXtX0 | nobody |
| $qZV4X6DTqMHUDIyZG.8PH. | |
| $z2VkRbfNoE/xHLBj8i2cv. | ftp |
| 7wtxBdUGBnuoY | runtop10 |
| 9B60FC59706134759DBCAEA58CAF9068 | Fireitup |
| LHjQopX4yjf1Q | ls123 |
| ab8nBoH3mb8.g | helpme |
| absxcfbgXtb3o | xc3511 |
| xt5USRjG7rEDE | j1/_7sxw |
| $1$EmcmB/9a$UrsXTlmYL/6eZ9A2ST2Yl/ | |
| $1$soidjfoi$9klIbmCLq2JjYwKfEA5rH1 | |
Hijacking the default password
tested on Goke
Over the UART interface, it is possible to temporarily interrupt the normal booting sequence and drop into a limited Linux shell at early stage of system startup.
setenv bootargs ${bootargs} single init=/bin/sh
boot
This shell won't load the full working system, so you have to amend it manually.
First, mount /rom filesystem:
mount -t jffs2 /dev/mtdblock3 /rom
Mount the rest of mounting points from /etc/fstab:
mount -a
Also mount the SD card to copy files to and from:
mount /dev/mmcblk0p1 on /mnt/s0
On /rom filesystem, you can edit the /room/etc/passwd file but once the
device restarts it will be reset to default. This happens because there is a
guide bin file recreating passwd file on each start, so we need to modify
that executable.
Copy system.dat to an SD card:
cp /rom/system.dat /mnt/s0
On a linux computer, unpack system.dat file using unsquashfs:
mkdir squashfs-temp
cd squashfs-temp
unsquashfs system.dat
Find guide file and edit its content in a hex-editor to modify the name of the
file where password is written on every restart. Search for /etc/passwd and
change a letter in its name to something different, like /etc/passwT.
Pack the squash file system using mksquashfs:
mksquashfs ./squashfs-root ./file -comp xz -no-xattrs -noappend -no-exports -all-root -quiet -b 131072
and copy it from the SD card back to /rom directory on the camera.
Now you can replace the password in /rom/etc/passwd with your own password, and when
you restart the device, you will have full working system with your own password.