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New version of network scanning tool arp-scan released

15th March 2011 A new version of a respected and popular network scanning tool has been released. Read More

Tests show rise in number of vulnerabilities affecting web applications with SQL Injection and XSS most common flaws

1st March 2011 SQL injection and cross-site scripting (XSS) were the most common flaws found in web applications in 2010 according to results from tests carried out by NTA Monitor. Read More

Assess risk to manage effects of budget cuts

9th February 2011 Signs of economic recovery may be appearing in some industries, but for most organisations - particularly in the public sector - budget cuts and cost savings are here to stay for the foreseeable future. Read More

"Basic security threats not changed in 15 years"

1st February 2011 There may have been significant technological advances to the hardware and software organisations use, but according to Roy Hills, who co-founded NTA Monitor in 1996, the basic security threats have not changed in the last 15 years. 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