Monthly Archives: April 2019

Hacking a Verizon RC8021V IP camera – Part 1

A few months ago a tenant next to my friends’ warehouse threw way something like 100 IP cameras that were still sealed in the box. One of my other friends took the bulk of them with hopes of making a profit and the friend who initially found them saved me a few because he thought I’d like playing with them (little did he know what this would turn into). When I tried setting one up I found that it was a Verizon-branded version of the Sercomm RC8021 camera. The web console had a username/password combination that did not match up with anything I found online. Because of this the camera was essentially useless as you could not configure any settings or join it to a wireless network. I thought cracking this camera would make for an interesting exercise/challenge and It turned out be exactly that…

Initial Reconnaissance

I started out by researching the camera model and any default passwords associated with it. I came across references to the default credentials for an RC8021 being ‘administrator’ with a blank password. That didn’t work along with anything else I could think of admin/blank, admin/admin, administrator/admin, etc. Resetting the camera didn’t help with this either. Verizon’s own document for this camera was still available online, but had nothing useful. Some Googling also revealed some documented APIs for the camera, but any of the APIs I hoped to get access to required authentication. A port scan did not yield anything useful. I did find that the camera had a port open for UPnP, but I wasn’t able to use any of the known UPnP exploits to gain access to the camera or its file system.

Obtaining Physical Access

After all my initial attempts to get into this camera were unsuccessful, I decided to crack the camera open and start poking around. Below are both sides of the camera board. The four connection points within red square below are indicative of a UART connection. The other clue to this was the square connection to the far right. That would likely be the ground. I used my multi-meter to test these points and verified this.

Now that I was confident I had located a UART connection I broke out the soldering iron and soldered a four pin header here…

After soldering the header I just needed to figure out which pin was RX and which was TX. I already knew what ground was, so figuring out RX/TX was simple. VCC was not necessary since the camera had its own power supply. I hooked up three of the pins to a USB->UART converter, connected Putty to the COM port assigned to the converter on my computer, and set the Putty serial session with a common config:

Speed (baud): 115200
Data bits: 8
Stop bits: 1
Parity: Even
Flow control: None

Once I hooked the camera up to power I was able to watch the entire boot process and eventually received logon prompt. My initial hope was that the shell was not password protected or at least had a blank root password, but I was not that lucky. This was the the boot up output:

 The bootloader version 4.09
Flash Size = 4M(8K x 8,64K x 63)
MAC address 00:0e:8f:7a:34:83
unprotected area checksum = 00000000
Uncompressing Linux………………………………………… done, booting the kernel.
Linux version 2.4.19-pl1029 (peggy@ISBU-Compiler-B1) (gcc version 3.3.4) #294 Thu Sep 29 14:27:29 CST 2011
CPU: Faraday FA526id(wb) revision 1
ICache:16KB enabled, DCache:16KB enabled, BTB support, IDLE support
Machine: Prolific ARM9v4 - PL1029
Prolific arm arch version 1.0.11
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel saved command line [arch]: root=/dev/mtdblock3 rootfstype=squashfs
Kernel command line [options]: root=/dev/mtdblock3 rootfstype=squashfs
plser console driver v2.0.0
Calibrating delay loop… 147.56 BogoMIPS
Memory: 32MB = 32MB total
Memory: 30764KB available (1263K code, 284K data, 64K init)
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
POSIX conformance testing by UNIFIX
PCI: Probing PCI hardware on host bus 0.
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
tts/%d0 at MEM 0x1b000400 (irq = 2) is a PLSER
Prolific addr driver v0.0.4
Starting kswapd
devfs: v1.12a (20020514) Richard Gooch (
devfs: boot_options: 0x1
squashfs: version 3.0 (2006/03/15) Phillip Lougher
i2c-core.o: i2c core module version 2.8.1 (20031005)
i2c-dev.o: i2c /dev entries driver module version 2.8.1 (20031005)
Prolific i2c algorithm module v1.2
Initialize Prolific I2C adapter module v1.2.1
found i2c adapter at 0xd9440000 irq 17. Data tranfer clock is 100000Hz
i2c-proc.o version 2.8.1 (20031005)
pty: 256 Unix98 ptys configured
Software Watchdog Timer: 0.05, timer margin: 60 sec
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
PPP generic driver version 2.4.2
PPP Deflate Compression module registered
PPP BSD Compression module registered
Linux video capture interface: v1.00
Prolific Audio AC97 driver version 2.2.2 for 63 and 29 Audio Module 2006/03/21
ac97_codec: AC97 Audio codec, id: 0x414c:0x4770 (Realtek ALC203/203LF)
PL-1029 NOR flash driver for MTD, version 0.8.0 sc 1
NOR flash type: ppi-amd 8x8 64x63
NOR flash id = 0xa8
nor interrupt 30 registered
Creating 9 MTD partitions on "plnormtd":
0x00000000-0x00008000 : "bootloader"
0x0000c000-0x0000e000 : "MAC"
0x000e0000-0x00400000 : "SQUASHFS"
0x0000e000-0x00010000 : "LOGO Image"
0x00020000-0x00400000 : "Kernel+FS"
0x00000000-0x00400000 : "ALL"
0x0000a000-0x0000c000 : "HTTPS CA"
0x00010000-0x00020000 : "CONFIG"
0x00008000-0x0000a000 : "Reserve"
usb.c: registered new driver hub
usb-ohci-pci.c: usb-00:05.0, PCI device 180d:2300
usb-ohci.c: USB OHCI at membase 0xd8400000, IRQ 9
usb.c: new USB bus registered, assigned bus number 1
usb.c: ### @@@ usb_set_address
usb.c: >>> usb_get_device_descriptor
usb.c: >>> usb_get_configuration
hub.c: USB hub found
hub.c: 4 ports detected
Prolific Real-Time Clock Driver version 1.0.0 (2003-04-02)
PL UART driver version 1.0.1-1 (2006-04-21)
Initializing Cryptographic API
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
ip_tables: (C) 2000-2002 Netfilter core team
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
802.1Q VLAN Support v1.8 Ben Greear
All bugs added by David S. Miller
Fast Floating Point Emulator V0.9 (c) Peter Teichmann.
RAMDISK: squashfs filesystem found at block 0
RAMDISK: Loading 2221 blocks [1 disk] into ram disk… done.
VFS: Mounted root (squashfs filesystem) readonly.
Mounted devfs on /dev
Freeing init memory: 64K
pl serial only support even parity
init started: BusyBox v1.01 (2011.09.29-06:29+0000) multi-call binary
init started: BusyBox v1.01 (2011.09.29-06:29+0000) multi-call binary
Starting pid 11, console /dev/tts/0: '/etc/init.d/rcS'
Starting the boot scripts…
Watchdog is at home.
Using /lib/modules/2.4.19-pl1029/watchdog.o
Using /lib/modules/2.4.19-pl1029/gpio_drv.o
insmod: io_expander.o: no module by that name found
insmod: leds.o: no module by that name found
insmod: lcd.o: no module by that name found
insmod: switchs.o: no module by that name found
Using /lib/modules/2.4.19-pl1029/reset.o
insmod: rtc_drv.o: no module by that name found
insmod: iris_drv.o: no module by that name found
insmod: analog_out.o: no module by that name found
insmod: echo_cancel.o: no module by that name found
/etc/init.d/rcS: 69: /usr/local/bin/pt_chk: not found
/sbin/ifconfig lo
RT61: Vendor = 0x1814, Product = 0x0301
System Info:
fw_ver: V1.0.03
fw_create_date: [2011-09-29 14:31:19 +0800 ]
mac_addr: 00:0e:8f:7a:34:83
def_name: VZ7A3483
release_date: Sep 29,2011
model_name: RC8021V
Assigned Info:
power line freq=60
aes interrupt 12 registered
Using /lib/modules/crypt.o
cp: /usr/local/bin/stunnel.pem: No such file or directory
cp: /usr/local/bin/CAcerts.pem: No such file or directory
OV7725 detected!
Using /lib/modules/2.4.19-pl1029/ov_7725.o
plmedia version
Hello Grabber!
Hello Encoder!
Hello PLMD!
Using /lib/modules/plmedia.o
Using /lib/modules/2.4.19-pl1029/dmac.o
DMAC Driver (Ver:, Release-Date: 25-Sep-2009)
/etc/init.d/rcS: 102: /usr/local/bin/io_init: not found
/etc/init.d/rcS: 116: /usr/local/bin/dnswitch_action: not found
Davicom DM91xx net driver loaded, version 1.37 (JUN 16, 2004): VLAN support 4…
RT61: Vendor = 0x1814, Product = 0x0301
Ethernet link is ready now
Jan 1 00:00:09 dhcpcd[136]: DHCP successfully worked with the server (
/etc/init.d/rcS: 139: /usr/local/bin/jabberlog: not found
pl serial only support even parity
RC8021V7A3483 login: pc : [<0000a8a4>] lr : [<0000a868>] Not tainted
sp : bffffb28 ip : ffffffff fp : 00036e90
r10: 00024eb8 r9 : 00033ce0 r8 : 00033ca8
r7 : 00000000 r6 : 00021db8 r5 : 00000000 r4 : 0000000a
r3 : 00000000 r2 : 0000000a r1 : 000171ca r0 : 00000000
Flags: nZCv IRQs on FIQs on Mode USER_32 Segment user
Control: 397D Table: 01E8C000 DAC: 00000015
RC8021V7A3483 login:

With this output we’re able to see a few interesting things. We get a lot of information about what the underlying bootloader/OS/filesystem look like, we get more hardware information, and all of this gives us more information we can Google against. I tried logging into the camera with root and various passwords, but was unsuccessful. Once I started Googling against this information I found that this camera platform was actually fairly common and that a number of other cameras were pretty much identical to this one. Some models were Sercomm RC8021, ADT Pulse RC8021W, Linksys WVC54GCA, Sitecom WL-404, Sitecom LN-406, NorthQ NQ-9006, and some others. The actual manufacturer of this platform was Sercomm with their RC8021 camera, but unfortunately their web site had absolutely nothing to offer.

Stay tuned for Part 2…

Modifying Windows Server Failover Cluster (WSFC) node subnets the quick and dirty way

We were in the middle of expanding a server subnet and ran into complications. If you did not bring down the entire cluster and tried to make subnet mask changes to a NIC you ran into all kinds of complications which could take a while to fix. We wound up evicting nodes, removing/recreating SQL AG listeners (for SQL AlwaysOn nodes), rebooting nodes, etc. Basically, WSFC pulls subnet configuration directly from the NICs used in the cluster and you have to bring cluster services down, make changes, bring them back up in a specific order to avoid issues. I decided to find a faster way to accomplish this. It involves modifying the CLUSDB cluster configuration registry hive (here is a good page on this database). When cluster services are actually running this registry hive is mounted as ‘HKLM\Cluster‘, but we will be taking down the cluster and manually mounting the hives for offline modification.

  1. Stop other cluster-related services (like SQL Server) on all nodes
  2. Shutdown the entire cluster. You can do this from the ‘Failover Cluster Manager’, PowerShell, or the old ‘cluster.exe’ utility
  3. Verify the ‘Cluster Service‘ service is stopped on all nodes
  4. Update the subnet mask(s) on the appropriate NICs on all nodes
  5. Update the CLUSDB registry hives on ALL nodes. Make sure you are updating the correct registry values with the correct values. There are both regular subnet mask values AND subnet CIDR values to update
    • BACKUP THE ‘C:\Windows\Cluster\CLUSDB’ files on all nodes BEFORE making any changes. You may want to backup/snapshot the server as well
    • Load the ‘C:\Windows\Cluster\CLUSDB’ registry hive (REG LOAD HKLM\CLUSDB “C:\Windows\Cluster\CLUSDB”)
    • Edit HKLM\CLUSDB\NetworkInterfaces\OBJECTGUID\AddressPrefixList\0000  values
    • Edit HKLM\CLUSDB\Networks\OBJECTGUID  values
    • Edit HKLM\CLUSDB\Networks\OBJECTGUID\PrefixList\0000  values
    • Edit HKLM\CLUSDB\Resources\OBJECTGUID\Parameters values (for IP address resources)
  6. Start cluster again
  7. Verify all networks and IP address cluster resources are displaying right subnet values
  8. Start any other cluster-related services you may have stopped in step #1
  9. Verify functionality of the cluster and all other services

This method could also be used to move the cluster to an entirely new subnet, but it might be easier just to create new IP resources (which will create new cluster networks) at that point.

Here are the first two examples of the registry changes above: