Network Vulnerability Assessment Report Sorted by host names

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1 Network Vulnerability Assessment Report Sorted by host names Session name: isp-ss-sample Total records generated: 31 high severity: 3 low severity: 23 informational: 5 Start time: :43:09 Finish time: :00:35 Elapsed: 0 day(s) 00:17:26 Summary of scanned hosts Host Holes Warnings Open ports State Finished Service Severity Description telnet (23/tcp) Info Port is open smtp (25/tcp) Info Port is open domain (53/tcp) Info Port is open pop3 (110/tcp) Info Port is open ftp (21/tcp) Info Port is open smtp (25/tcp) High The remote sendmail server, according to its version number, may be vulnerable to the -bt overflow attack which allows any local user to execute arbitrary commands as root. Solution : upgrade to the latest version of Sendmail Note : This vulnerability is _local_ only ftp (21/tcp) High You seem to be running an FTP server which is vulnerable to the 'glob heap corruption' flaw. An attacker may use this problem to execute arbitrary commands on this host. *** As Nessus solely relied on the banner of the server to issue this warning, *** so this alert might be a false positive Solution : Upgrade your ftp server software to the latest version. CVE : CVE pop3 (110/tcp) High You are using qpopper 2.53 (or newer in the 2.5x series) There is a problem in this server which allows users who have a pop account to gain a shell Page 1

2 with the gid 'mail' by sending to themselves a specially crafted mail. Solution : Upgrade to the latest qpopper software Risk factor : Medium CVE : CVE smtp (25/tcp) Low a SMTP server is running on this port Here is its banner : 220 nasu.ne.jp ESMTP Sendmail 8.9.3/3.7W Wed, 31 Jul :45: (JST) pop3 (110/tcp) Low a pop3 server is running on this port telnet (23/tcp) Low a telnet server seems to be running on this port general/tcp Low Nmap did not do a UDP scan, I guess. smtp (25/tcp) Low The remote SMTP server answers to the EXPN and/or VRFY commands. The EXPN command can be used to find the delivery address of mail aliases, or even the full name of the recipients, and the VRFY command may be used to check the validity of an account. Your mailer should not allow remote users to use any of these commands, because it gives them too much information. Solution : if you are using Sendmail, add the option O PrivacyOptions=goaway in /etc/sendmail.cf. CVE : CAN domain (53/tcp) Low The remote bind version is : ftp (21/tcp) Low a FTP server is running on this port. Here is its banner : 220 nasu FTP server (SunOS 5.7) ready. general/tcp Low Nmap found that this host is running Solaris with tcp_strong_iss=2 domain (53/tcp) Low The remote name server allows recursive queries to be performed by the host running nessusd. If this is your internal nameserver, then forget this warning. If you are probing a remote nameserver, then it allows anyone to use it to resolve third parties names (such as This allows hackers to do cache poisoning attacks against this nameserver. Solution : Restrict recursive queries to the hosts that should use this nameserver (such as those of the LAN connected to it). If you are using bind 8, you can do this by using the instruction 'allow-recursion' in the 'options' section of your named.conf If you are using another name server, consult its documentation. Page 2

3 Risk factor : Serious CVE : CVE ftp (21/tcp) Low It is possible to determine the existence of a user on the remote system by issuing the command CWD ~<username>, even before logging in. Ie: telnet target 21 CWD ~root 530 Please login with USER and PASS. CWD ~nonexistinguser 530 Please login with USER and PASS. 550 Unknown user name after ~ An attacker may use this to determine the existence of known to be vulnerable accounts (like guest) or to determine which system you are running. Solution : inform your vendor, and ask for a patch, or change your FTP server general/icmp Low The remote host answered to an ICMP_MASKREQ query and sent us its netmask ( ) An attacker can use this information to understand how your network is set up and how the routing is done. This may help him to bypass your filters. Solution : reconfigure the remote host so that it does not answer to those requests. Set up filters that deny ICMP packets of type 17. CVE : CAN general/icmp Low The remote host answers to an ICMP timestamp request. This allows an attacker to know the date which is set on your machine. This may help him to defeat all your time based authentication protocols. Solution : filter out the ICMP timestamp requests (13), and the outgoing ICMP timestamp replies (14). CVE : CAN ntp (123/udp) Low It is possible to determine a lot of information about the remote host by querying the NTP variables - these include OS descriptor, and time settings. Theoretically one could work out the NTP peer relationships and track back network settings from this. Quickfix: Set NTP to restrict default access to ignore all info packets: restrict default ignore Page 3

4 pop3 (110/tcp) Low The remote POP server banner is : +OK QPOP (version 2.53) at nasu starting. ftp (21/tcp) Low Remote FTP server banner : nasu FTP server (SunOS 5.7) ready. smtp (25/tcp) Low The remote SMTP server allows the relaying. This means that it allows spammers to use your mail server to send their mails to the world, thus wasting your network bandwidth. /Medium Solution : configure your SMTP server so that it can't be used as a relay any more. CVE : CAN smtp (25/tcp) Low The remote SMTP server is vulnerable to a redirection attack. That is, if a mail is sent to : Then the remote SMTP server (victim) will happily send the mail to : Using this flaw, an attacker may route a message through your firewall, in order to exploit other SMTP servers that can not be reached from the outside. *** THIS WARNING MAY BE A FALSE POSITIVE, SINCE SOME SMTP SERVERS LIKE POSTFIX WILL NOT COMPLAIN BUT DROP THIS MESSAGE *** Solution : if you are using sendmail, then at the top of ruleset 98, in /etc/sendmail.cf, insert : $#error $: '551 Sorry, no redirections.' telnet (23/tcp) Low The Telnet service is running. This service is dangerous in the sense that it is not ciphered - that is, everyone can sniff the data that passes between the telnet client and the telnet server. This includes logins and passwords. CVE : CAN telnet (23/tcp) Low Remote telnet banner : You should disable this service and use OpenSSH instead. ( Solution : Comment out the 'telnet' line in /etc/inetd.conf. Page 4

5 SunOS 5.7 general/tcp Low The plugin traceroute.nasl was too slow to finish - the server killed it smtp (25/tcp) Low The EICAR test string was sent 4 times. Check your mailbox! smtp (25/tcp) Low Remote SMTP server banner : nasu.ne.jp ESMTP Sendmail 8.9.3/3.7W Wed, 31 Jul :47: (JST) 214-This is Sendmail version Topics: 214- HELO EHLO MAIL RCPT DATA 214- RSET NOOP QUIT HELP VRFY 214- EXPN VERB ETRN DSN 214-For more info use "HELP <topic>". 214-To report bugs in the implementation send to For local information send to Postmaster at your site. 214 End of HELP info ntp (123/udp) Low An NTP server is running on the remote host. Make sure that you are running the latest version of your NTP server, has some versions have been found out to be vulnerable to buffer overflows. *** Nessus reports this vulnerability using only *** information that was gathered. Use caution *** when testing without safe checks enabled. If you happen to be vulnerable : upgrade Solution : Upgrade CVE : CVE Page 5

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