Ubuntu Security :: Is Posting The Hardware Address A Security Risk
Feb 28, 2011When posting results from ifconfig, it shows the hardware address of etho, etc. Would you consider that to be a security risk ?
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Fedora Security :: Security Risk Of An Unencrypted /boot Partition?
Apr 8, 2009During a recent install I made the leap to encryption,but /boot must remain unencrypted.Is there really any legitimate security risk to having an unencrypted /boot partition? I mean basically someone can just see what kernel you're running which they could see during boot anyways right? Oh I and keep all my financial documents in /boot/finances/ (haha ok not really, but I am serious about the first part).
View 5 Replies View RelatedUbuntu :: Security Risk To Run Apache Web Server On Laptop?
Sep 29, 2010I am running Ubuntu 10.04 on my laptop. I have an Apache web server running that I can access at 192.168.1.102 ("It works! This is the default web page for this server. ...").
Are there any security risks in leaving this running? Is the web server available to anyone outside my network?
Ubuntu Security :: How To View Email Attachment Without Risk
Oct 30, 2010I have received an email with a .csv attachment from a bank, and need to know how to view the attachment without risk. Using View>Message Source I see a large solid block of random upper and lower case characters, whereas I would expect to see some readable text mixed in. The email subject and the attachment name both contain data specific to me, but the text of the email consists largely of disclaimers with no mention of my name or any clue as to the nature of the attachment. I am using Thunderbird as my email client.
View 8 Replies View RelatedUbuntu Security :: Risk With Automount As Root User
Jun 20, 2011i want to know the risk with auto mounting flash drive as a root user,if for example there is a Usb Flash drive inserted into the system and we login into root unknowingly, and this flash drive contains an autorun script which calls a new script that can place viruses in your system, since you are in the root it will not even prompt for password and if the script is fast enough you will not even see it executing.
View 7 Replies View RelatedUbuntu Security :: Are Microsoft Office Exploits Any Risk To Libreoffice?
Jun 3, 2011I have some questions about security
1> are the flash exploits are of any use to a Linux operating system like Ubuntu etc. ?
2>are the Microsoft office exploits any risk to libreoffice or open-office software suites?
3>are there exploits for Linux , open-office and libreoffice ?
Debian :: Security Risk Of Proprietary Firmware For AMD GPU Drivers?
Jul 27, 2015I need to build a new computer, and I'm considering buying an "AMD-oriented" motherboard, that comes with an integrated ATI Radeon GPU.But, being a big Free Software enthusiast, that likes to have completely free drivers for everything, and knowing that the "open source" Radeon driver, for ATI/AMD GPUs, uses a non-free firmware, I'm reluctant about this... Above all, because I don't know what kind of security risk I'm taking, when using a proprietary firmware.
And, having read what was recently reported about the security of proprietary firmwares, in general,URL... if the firmware component of graphics cards drivers poses any security threat?(I mean, can the firmware part of a graphics cards driver be used to do anything more than executing instructions to display graphics?)
Security :: Address Space Randomization On 2.6.28-15-generic Ubuntu 9.04 - Finding Base Address?
Sep 14, 2009Im an academic (university networks and security lecturer) studying/teaching network and operating system security, and inspired by the work of Hovav Shacham set about testing ASLR on linux. Principley I did this by performing a brute force buffer overflow attack on Fedora 10 and Ubuntu 9. I did this by writting a little concurrent server daemon which accidently on purpose didnt do bounds checking.
I then wrote a client to send it a malicious string brute forcing guessed addresses which caused a return-to-libc to the function usleep with a parameter of 16m causing a delay of 16 seconds as laid out in [URL] Once I hit the delay I new I had found the function and could calculate delta_mmap allowing me to create a standard chained ret-to-libc attack. All of that works fine. However .... To complete my understanding I am trying establish where I can find the standard base address for ubuntu 9 (and other distros) for the following, taken from Shacham:-
Quote:
[code]....
/proc/uid/maps gives me some information but not the base address ldd also gives me the randomised starting address for sections in the user address space but neither gives me the base address. Intrestingly ... when a run ldd with aslr on for over (about) 100 times and checked the start point of libc I determined that the last 3 (least significant) hex digits were always 0's and the fist 4 (most significant) where between 0xB7D7 and 0xB7F9. To me this indicated that bits 22-31 were fixed and bits 12-21 were randomized with bits 11-0 fixed. Although even that doesnt define the boundaries observed correctly.
Note: I am replicating the attack to provide signatures to detect it using IDS, and for teaching purposes. I am NOT a hacker and if needed to could reply from my .ac.uk email address as verification.
Ubuntu Security :: Use Address Not Ip In Iptables?
Jul 24, 2010i need to open this address ftp.nai.com, is there a way to use address not ip in iptables?
View 7 Replies View RelatedSecurity :: Can I Allow SFTP For ANY But SSH For Some IP Address
Jul 20, 2010Can I allow SFTP for ANY , but SSH for some IP address
View 6 Replies View RelatedSecurity :: Proftp Log MAC Address?
Mar 11, 2011how do you configure proftp to log MAC address on LAN, not just IP?
View 4 Replies View RelatedUbuntu Security :: How To Reset / Allocate IP Address
May 19, 2011For a while now, I have been trying to reset my IP address in Ubuntu but I have had no luck. The reasons why I want to reset it and get a new one is because my service provider waits weeks to change it. I am concerned it has fallen into some unsavory hands. Also, can you be hacked if the would-be attacker is unaware of your IP address? Are there other means of locating your computer on the web without an IP address or webserver?
View 6 Replies View RelatedUbuntu Security :: Allow Foreign IP Address In Hosts?
May 30, 2011I found this IP address in my hosts.allowQuote:ALL: 119.42.68.232I cannot find any other evidence of intrusion.
View 4 Replies View RelatedSecurity :: Netstat Output Has No Address?
Apr 19, 2011I've never seen the type of output from netstat and don't have a clue what it means.Quote:
tcp 0 0 :::8009 :::* LISTEN 31673/java
tcp 0 0 :::22 :::* LISTEN
[code]...
Ubuntu Security :: Block Device By Bluetooth Address?
Apr 22, 2010Is it possible somehow to block some bluetooth device with specif address (mac) ?
(like iptables block by mac)?
Fedora Security :: 'send' Address Can Be Spoofed
Oct 16, 2009I'm behind a modem router with firewall and SElinux enabled by default - but checking my mail this morning I noticed several ' delivery failures ' ( allegedly ) from hotmail referring to mail I hadn't sent. When I checked the spam folder for the on-line side of my mail account there were more failure notices. Two points that may be relevant, one is the recent Hotmail exploit, the other is that this only occurred with the address I use for railway matters, and some people cc to everybody, so it's odds on that address is on a good few computers. On one occassion when I checked my spam folder on-line I found spam which claimed to be from myself, so I know the ' send ' address can be spoofed, is this the explanation, or is it a new kind of attack linked to the Hotmail exploit?
View 13 Replies View RelatedFedora Security :: Blocking And Allowing IP Address For FTP?
Jul 15, 2010I want to ask about securing the FTP connection... I have one server that Installed with Redhat Linux Fedora 6.
And now, i want to securing the FTP access, so only the selected IP will be allowed to connect. Do anyone know how to do this?
Another thing is, my server using Webmin 1.3 to manage the server and there not installed / not configured yet with Frox FTP, ProFTPD Server, WU-FTP Server... even there is such thing in my Webmin...
Can i make use one of the three FTP i mention above, and if yes, will it be affecting the current FTP access?
Fedora Security :: Blocking Ip Address Range?
Dec 31, 2010I'm assuming that the following should block the complete 178.123.xxx.xxx address range.
Code:
iptables -I INPUT -s 178.123.0.0/24 -j DROP
Then I believe that I need to save this change.
Code:
service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
However, I'm not so sure that it is actually working based on the fact that there continues to be access to my wiki from that address range. The following is after I made the firewall change.
Quote:
178.123.177.61 - - [31/Dec/2010:04:24:40 -0500] "GET /mywiki/Opera%20Web%20Browser?action=edit&editor=text HTTP/1.1" 200 6346 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"
code....
Let me state that I'm new at this iptables thing. I did some reading and decided that I need to make the above change to the firewall but it doesn't seem to make a difference.
Fedora Security :: Any Way To Block IP Address Access?
Jul 27, 2011I recently set up a web server at home, using a non-standard port, due to my ISP blocking 80. I just checked my log files, and I see a TON of entries indicating that a file was not found "proxy-1.php", "proxyheader.php", etc. I do not have these files, not intend to have them as part of my website. I did a whois looking by IP address for several of these, and they all seem to come from an ISP in China. Is there a way to BLOCK any IP address outside the US (that is somewhat simple to do?)
View 5 Replies View RelatedSecurity :: Blocking A Specific IP Address From Server?
May 8, 2010I would like to COMPLETELY block a specific IP address using iptables. I found this one:
Code:
iptables -A INPUT -p tcp -s xxx.xxx.xxx.xxx -j REJECT --reject-with tcp-reset
Will this work? How do I undo the changes later?
Security :: Blocking An Ip Address Range Within Iptables?
Mar 30, 2009I am setting up a iptables firewall on one of our servers, and I would like to block a range of addresses from getting into the system. I am using a script that does a BLACKIN and BLACKOUT methodology for specific addresses. One example is the following:
Code:
$IPTABLES -A BLACKIN -s 202.109.114.147 -j DROP
...
$IPTABLES -A BLACKOUT -d 202.109.114.117 -j DROP
What would be the correct syntax to use if I wanted to block an entire remote subnet from getting into the server?
Security :: Properly Set Up Ssh To Only Allow One IP Address To Login Remotely?
Apr 6, 2010properly set up ssh to only allow one IP address to login remotely
View 2 Replies View RelatedSecurity :: Block Any IP Address Who Failed To Connect More Than 3 Ssh
Mar 25, 2010how to block any IP address who failed to connect more than 3 ssh?
View 5 Replies View RelatedSecurity :: Racoon Address Bind Failure?
Mar 11, 2010I did not use below configuration in my racoon conf,
remote anonymous {
exchange_mode main;
lifetime time 1 hour;
proposal {
encryption_algorithm 3des;
hash_algorithm md5;
[Code]...
I've pruned your post from where you originally posted. In the future, please check the dates on threads which you're thinking about posting in. If you see they are dead (inactive for a few months or more) just let them rest in peace and start your own thread. You can always include links to reference the dead thread if you need to, as I've done here.
Security :: The Server Was Hacked From So Called Tor IP Address?
Nov 14, 2010I always use professional services to secure my servers. Everything was fine for years but a week ago my server got hacked.I don't know how the hacker got my username/password - it was not something like admin, password.9 months ago my PC was infected with some virus which connected to the FTP server by using password which was saved in CuteFTP and infected all index files with some javascript. Then I changed the user/FTP password and didn't save it anymore in Cute FTP. Of course, I checked all the folders and re-uploaded all infected files. Is it possible that this virus uploaded some hidden file which was able to get the new password for this account?
The server was hacked from so called Tor IP address. I am tiref of worrying about server security and now have an idea to get a static IP address from my ISP and to allow logins only from this IP address. What do you think about it? This idea looks good for me but are there any risks to lose access to the server. Can ISP provider change the static IP address for some reason?
Ubuntu Security :: Contact Form - Encode Email Address?
Feb 5, 2010I get a lot of spam recently and I think is from my contact page... how do I encode my email address so that It won't be picked up by spam bots?
View 3 Replies View RelatedUbuntu Security :: NMap Lists Unknown Local IP Address
Jul 18, 2010I wouldn't call myself paranoid, but I do try to keep reasonably secure on my home network (WPA encryption, router firewall, etc.). I also occasionally use nmap to make sure I don't see any unknown computers logged into my network. The problem is I have five computers that all use DHCP on the network and they are not all up all of the time. At most, there are two to three online at any one time.
So, my question is: Do any of the IP addresses remain in the router's database for a computer that has gone offline (shutdown)?
The reason for my question is that today I ran nmap on my home network and noted an IP address that was not currently up on the network. It is, however, an address that is frequently assigned to one of the computers when it is online, but that address was not up at the time I ran nmap. Just trying to make sure my network is not being used by some nearby computer.
Fedora Security :: Block Some Ip Address That Are Attacking Server?
Aug 26, 2009I want to block some ip address that are attacking my server and making my ssh port busy. On searching the google, I found
Code:
iptables -A INPUT -s ip_address -j DROP
I will add this rule in iptables. My questions are:
1) do I have to do
Code:
chkconfig iptables on
so that it load the iptables at boot. I am wondering why do I need this because iptables is already modified and it loads the iptables at boot time if firewall is enabled.
2) When we add the above rule, which file is modified? Another way, where are this rules stored? It is not in /etc/sysconfig/iptables and /etc/sysconfig/iptables_config.
Security :: Block Computer From Connecting To A Specific IP Address?
Feb 13, 2010I was taking a peek at the active connections shown by the Firestarter GUI and noticed the following (the source is my computer):
SourceDestinationPortServiceProgram
192.168.0.11266.235.133.4280HTTP
I closed all Internet related apps and the connection persisted. After a reboot it did not reconnect (yet).The IP address appears to belong to esomniture.com - some sort of web analytics company. How do I prevent my computer from connecting to these rascals. I have found a lot of documentation regarding stopping inbound connections to services on my computer but not the other way. I have various filtering addons installed in Firefox however, this connection seems to be at a lower level as no program is specified as being responsible for the connection.
Ubuntu Security :: Restrict Root Logons To The SSH Server To A Single Ip Address?
Feb 26, 2010Is it possible to restrict root logons to the SSH server to just a single ip address (or maybe a range?) I have other users connecting to the server daily so restricting ALL access to a single ip i cannot do. I need root enabled (for my own reasons) but want to lock it down a bit more.
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