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Living with threats

1st August 2010 Back in 2004, Bill Gates predicted that spam would be a thing of the past within two years. As we all know now, and quite a lot of people predicted at the time, far from being a solved problem, the volume of spam has continued to increase. Read More

Web application security goes from bad to worse in many sectors

27th July 2010 NTA Monitor's 2010 Annual Web Application Security Report analysed the data gathered from web application security tests performed for a wide range of industry sectors over a 12-month period... Read More

IT Managers get to grips with Internet security issues

4th May 2010 According to NTA Monitor's 2010 Annual Security Report, the average number of Internet security vulnerabilities afflicting organisations has fallen.. Read More

Responsible Patching

1st January 2010 Microsoft's response to the "zero day" exploit that was used in the cyber attacks against Google shows that software vendors still have a lot to learn when it comes to responding to vulnerabilities. Read More

Annotated tcpdump packet trace on ftp server

# Hacker -< Server:21 TCP Handshake

# Note: The Hacker's source port has been changed from 1035 to 62230 and
# the Server IP address has been changed from 194.217.26.147 to 10.1.13.5
15:29:24.560482 < 195.102.196.156.62230 > 10.1.13.5.21: S 1849799952:1849799952(0)
15:29:24.560482 > 10.1.13.5.21 > 195.102.196.156.62230: S 2690657606:2690657606(0) ack 1849799953 15:29:24.560482 < 195.102.196.156.62230 > 10.1.13.5.21: . 1:1(0) ack 1

# Server:21 -< Hacker "220 FTP server ready."

15:29:24.590479 > 10.1.13.5.21 > 195.102.196.156.62230: P 1:24(23) ack 1 15:29:24.590479 < 195.102.196.156.62230 > 10.1.13.5.21: . 1:1(0) ack 24

# Hacker -< Server:21 "USER anonymous"

15:29:37.169366 < 195.102.196.156.62230 > 10.1.13.5.21: P 1:17(16) ack 24 15:29:37.169366 > 10.1.13.5.21 > 195.102.196.156.62230: . 24:24(0) ack 17

# Server:21 -< Hacker "331 Guest login ok, send your complete e-mail..." 

15:29:37.169366 > 10.1.13.5.21 > 195.102.196.156.62230: P 24:92(68) ack 17 15:29:37.269357 < 195.102.196.156.62230 > 10.1.13.5.21: . 17:17(0) ack 92

# Hacker -< Server:21 "PASS rsh@"

15:29:44.418749 < 195.102.196.156.62230 > 10.1.13.5.21: P 17:28(11) ack 92

# Server:21 -< Hacker "230 Guest login ok, access restrictions apply"

 15:29:44.428749 > 10.1.13.5.21 > 195.102.196.156.62230: P 92:140(48) ack 28 15:29:44.518741 < 195.102.196.156.62230 > 10.1.13.5.21: . 28:28(0) ack 140

# Hacker -< Server:21

"PORT 195,102,196,156,211,93" (195.102.196.156:54109) # Note: The PORT command has been we-written from 195,102,193,28,38,148 # to 195,102,196,156,211,93. Both the IP address and the port have been # changed.
15:30:10.350623 < 195.102.196.156.62230 > 10.1.13.5.21: P 28:57(29) ack 140

# Server:21 -< Hacker "200 PORT command successful."

15:30:10.350623 > 10.1.13.5.21 > 195.102.196.156.62230: P 140:170(30) ack 57 15:30:10.450633 < 195.102.196.156.62230 > 10.1.13.5.21: . 57:57(0) ack 170

# Hacker -< Server:21 "LIST"

15:30:16.261216 < 195.102.196.156.62230 > 10.1.13.5.21: P 57:63(6) ack 170

# Server:20 -< Hacker:54109 TCP Handshake

# Note: Although this is directed towards the hacker, the Firewall changes
# the Destination IP address to be the victim on the way out.
15:30:16.261216 > 10.1.13.5.20 > 195.102.196.156.54109: S 2749222487:2749222487(0)
15:30:16.261216 < 195.102.196.156.54109 > 10.1.13.5.20: S 3823327867:3823327867(0) ack 2749222488 15:30:16.261216 > 10.1.13.5.20 > 195.102.196.156.54109: . 1:1(0) ack 1

# Server:21 -< Hacker "

150 Opening ASCII mode data connection for..." 15:30:16.271217 > 10.1.13.5.21 > 195.102.196.156.62230: P 170:233(63) ack 63

# Server:20 -< Hacker Directory listing

15:30:16.271217 > 10.1.13.5.20 > 195.102.196.156.54109: P 1:70(69) ack 1

# FTP data TCP shutdown

15:30:16.271217 > 10.1.13.5.20 > 195.102.196.156.54109: F 70:70(0) ack 1 15:30:16.271217 < 195.102.196.156.54109 > 10.1.13.5.20: . 1:1(0) ack 70 15:30:16.271217 < 195.102.196.156.54109 > 10.1.13.5.20: . 1:1(0) ack 71 15:30:16.371227 < 195.102.196.156.62230 > 10.1.13.5.21: . 63:63(0) ack 233 15:30:16.591249 < 195.102.196.156.54109 > 10.1.13.5.20: F 1:1(0) ack 71 15:30:16.591249 > 10.1.13.5.20 > 195.102.196.156.54109: . 71:71(0) ack 2

# Server:21 -< Hacker "226 Transfer complete."

15:30:16.591249 > 10.1.13.5.21 > 195.102.196.156.62230: P 233:257(24) ack 63 15:30:16.691259 < 195.102.196.156.62230 > 10.1.13.5.21: . 63:63(0) ack 257

# Hacker -< Server:21 "QUIT"

15:30:22.641843 < 195.102.196.156.62230 > 10.1.13.5.21: P 63:69(6) ack 257

# Server:21 -< Hacker "221-You have transferred..." 

(two packets) 15:30:22.641843 > 10.1.13.5.21 > 195.102.196.156.62230: P 257:303(46) ack 69

# FTP control TCP shutdown

15:30:22.651844 > 10.1.13.5.21 > 195.102.196.156.62230: FP 303:441(138) ack 69 15:30:22.661845 < 195.102.196.156.62230 > 10.1.13.5.21: . 69:69(0) ack 442 15:30:22.661845 < 195.102.196.156.62230 > 10.1.13.5.21: F 69:69(0) ack 442 15:30:22.661845 > 10.1.13.5.21 > 195.102.196.156.62230: . 442:442(0) ack 70