Security :: How To Keep Safe PC Using Iptables
Dec 5, 2010I am using Fedora on my desktop pc. I want to know how can i protact my PC from outside world. What firewall policy should i implement in iptables to keep it more secure.
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Security :: Safe To Use IPTables Firewalls?
Jun 14, 2010Other than Firestarter, how safe is it to use an iptables firewall for Linux if you know the basics of iptables but not the details and not exactly what you're doing with iptables? I want to be very secure without configuring iptables myself if possible or doing as little as possible. If you don't think iptables is safe if you don't really know what you're doing, which firewall you can use (Slackware specific, preferably) that is the easiest to install and configure? Are there any that work like free Windows firewalls, other than Firestarter? I've looked around and looked at slackbuild and can't find a Firestarter package, I searched this site also and saw something about the reason there isn't one. I'm concerned with my security and I don't want to write my own iptables firewall - I don't fully know what I'm doing.
View 6 Replies View RelatedUbuntu Security :: Firewall - IPTables Stock Settings Safe?
Apr 15, 2010So I know Linux has iptables, I'm rather new to linux, and I'm wondering, are the stock settings with Ubuntu/Kubuntu safe? Is there anything I need to do make them more secure? I tried adding rules myself for some things but ended up just not being able to do anything so I had to reset back to stock with iptables -F. Should I be safe running as-is?
View 4 Replies View RelatedSecurity :: Correct/safe Iptables Rules For Redirecting Port 80 To 8080?
Jul 13, 2010I am setting up tomcat server on my Centos 5.5 machine. I've been advised to run tomcat on 8080 as non root user and redirect traffic to it from port 80.
I searched and found the following iptables commands for this:# iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT -to-ports 8080
# iptables -I INPUT -p tcp --dport 8080 -j ACCEPTI have a doubt:
Tomcat is not accessible via port 80 without the second command. But the second command opens 8080 and makes it accessible over the internet (tomcat is accesible via both: www.<website>.com and http://<ip address>:8080). This doesn't seem right. Is there some simple (iptables) way to redirect traffic "internally" from port 80 to 8080 without having to open 8080 to the internet.
Ubuntu Servers :: Ufw And Safe To Use Iptables Only For ICMP Rules?
Aug 5, 2010In Lucid I have some ufw rules but I figured that I need to limit the ICMP messages that the box responds to and also limit their number. There are iptables rules to accomplish this but since I already have ufw rules it is safe to use iptables only for ICMP rules ?
View 4 Replies View RelatedGeneral :: Security - Is It Safe To Run An Old Version?
Dec 14, 2010I'm currently running OpenSuSE 11.3. I'm afraid as newer versions are released they will demand more of my old PC (Dell Optiplex GX270). Also, I've heard of issues with newer Linux distributions having issues with older Intel hardware (just hearsay, not personal experience). However, patches for specific OpenSuSE releases have a limited window of time.So,
Am I much more at risk to security issues if I keep a version of Linux past its patch date?Is it possible to keep a specific Linux release but still be able to receive security essential updates based on my repository selection?
Ubuntu Security :: How To Keep Keyring Safe
Nov 12, 2010It seems to me that he passwords kept in GNU Keyring Seahorse, are not kept very safe, because if I'm logged in and someone access my cumputer they can see my passwords that are saved there. I have set a keyring password, but it seems that is it not all the time locked.What are some general follow guide rulles to make sure my passwords are kept safe and my encryption keys that I use.
View 2 Replies View RelatedSecurity :: Safe Sites To Download From?
Jun 11, 2011How do you know if a site is safe to download from ?
Have only been using Mint 11 for 3 days after 7 years with windows and the usual safety nets there were the https headings and firewalls blocking stuff but how do you know something is safe in Linux ?
In short how do you know it's a trusted site ?
Fedora Security :: Runscape Applet : Is It Safe To Run?
Sep 29, 2010When I go to the Runesacpe page to run the game I get a message that says that the aplit is not signed.
Is it safe to run.
Does anyone know what it does, other than just run the game?
Ubuntu Security :: Encrypt With Right Click Safe?
Jul 13, 2011I just found a neat way to encrypt a file in Ubuntu 10.04.
I right click on a file and select the Encrypt option. The program prompts me to "Choose Recipient" so I choose myself on the list. Then it prompts me to enter my passphrase.
Once all that's done I hit enter and it adds .pgp to the end of whatever file just encrypted. The same basic method is used to Sign the file.
Does it sound as though what I said is correct and that the file I wanted to encrypt was indeed encrypted?
Can anyone crack my files without the passphrase? I'm sure it depends on the complexity and length of the passphrase.
Security :: Lightning Rod Keeps You Safe From Dirty Flashers
Jan 3, 2010A new open source package called Lightning Rod will help to close security exploits in Adobe's dirty Flash code. A presentation made at the 26th Chaos Communication Congress showed that the package does its job by reviewing incoming code before the browser executes it. Heise Online is reporting that this method can block over 20 different known attacks and can even be used to filter out malicious JPG attacks. As more vulnerabilities are discovered they can be added to Lightning Rod to close the breach.
View 2 Replies View RelatedUbuntu Security :: Port Fowrarding - Safe / Unsafe?
Sep 8, 2010when I apply port forwarding to my router @ home? Is it a risk to every computer on the network or just specifically the server that is involved?
View 9 Replies View RelatedUbuntu Security :: Is It Safe To Disable The Firewall For Limewire
Sep 24, 2010I opened a specific port in my router and manually configured Limewire to use the same port for all traffic, but I notice when I disable and turn off Firestarter when on limewire, my searches go really fast and dowaloads zoom really fast also I am not running as root. Is this ok to temporarly stop the firewall when I am on Limewire and then turn it back on when finished?
View 9 Replies View RelatedUbuntu Security :: Adblock Plus - Safe For Chromium & Firefox?
Apr 19, 2011I would like to know if you guys think this is a safe plugin/extension to use with either Chromium or Firefox.
There is an old page that shows it had security issues in the past.[URL].. Would it be safe to use this or do you think someone could use it to steal my passwords, etc. while browsing?
Ubuntu Security :: How Safe Are Updates On Public Networks
Jul 17, 2011how safe is it to run Ubuntu updates when I'm connecting via a public network (wireless or wired) from a hotel (or other public settings). I'm not familiar with the internals but is there an additional validation mechanism for the package servers other than the URL ?
View 4 Replies View RelatedUbuntu Security :: Is It Safe To Use Apt-get Trough Untrusted Proxies/mirrors?
Jul 10, 2010What if someone tampered with some important security updates, and suddenly you get a rootkit instead?
View 4 Replies View RelatedUbuntu Security :: Safe When Surfing The Web With The Defalt Installation Seetings ?
Apr 7, 2011I am new to Ubuntu so Iwant to know,Am I safe when on-line with the default installation settings on? If not what should I do?
View 6 Replies View RelatedDebian Installation :: Packages (Security Sensitive) In Aptitude Safe Upgrade?
Feb 17, 2011Today I ran
aptitude update && aptitude safe-upgrade
Like I regularly do, and I see these two packages need to be upgraded:
login passwd
Since these packages seem kinda security-sensitive I would like to know exactly why I would need to upgrade them. I checked Debian's security list but couldn't find anything relevant, and the links to the changelog for both packages are broken:
The requested URL /changelogs/pool/main/s/shadow/shadow_4.1.4.2+svn3283-2+squeeze1/changelog was not found on this server.
Where can I see what is changed in these packages so I can safely upgrade?
Ubuntu Security :: Safe To Transfer Files From Infected Windows Partition?
Sep 2, 2010My Windows XP Pro laptop has been attacked! Windows will no longer update and Microsoft Security Essentials will not update either. I've been trying to resolve the issue for over two weeks with Microsoft support, but it's just taking too long. I also tried some rescue CD options (all running some form of Linux, obviously):
- BitDefender Rescue CD (removed infections, now detects nothing),
- Kaspersky Rescue CD 10 (removed infections, now detects nothing),
- Trinity Rescue CD (won't load AV Engine, so can't use it to do anything).
Malwarebytes cleaned a bunch of stuff, but will not clean the final threat detected (it's supposed to get deleted on reboot, but never does). Hijack.FolderOptions is stuck in the accursed registry, and it keeps causing Windows Explorer to crash. I cannot rename files or work with them or everything just crashes.
So I'm ready to reinstall XP from scratch, and add a dual boot with Xubuntu & LXDE, which I'm already running on a much older laptop.
Question: I want to rescue the files I need. My idea was:
1) Install Xubuntu with dual boot.
2) Copy over files from Windows XP partition using Xubuntu.
3) Back up files to an external drive using Xubuntu.
4) Reinstall XP Pro and format hard drive.
5) Reinstall Xubuntu with dual boot.
6) Use Xubuntu for daily use.
7) Only use XP for those tasks that require it (TomTom updates ...)
Should I be concerned about the security risk from copying files from the Windows partition to the Xubuntu partition, and from there onto an external hard drive?
Is this the way to do it, or is there a better way? I just want my laptop back in working order. Right now I can't use it for anything.
Ubuntu Security :: SkyDrive + Encryption - Safe Backup - ADrive's Uploader Is Not On Https
May 6, 2010I'm trying to figure out how to use ADrive.com's 50 GB's or SkyDrive's 25 GB's of free storage to backup my computer automaticaly.
Problem's:
1. With ADrive I can select all my files at once through their website's uploader vs SkyDrive where you have to select them one by one. There are some third party programs, like Gladinet, which will mount sky drive to your computer like an extra drive, though I haven't found one for linux yet. This guy came up with a cool way to backup automagically with Windows: [URL] I am trying to figure out how to do the same thing with Linux.
2. ADrive's uploader is not on https, whereas SkyDrive is. Either way I wanted to encypt my files on my computer first so when I back them up, they are safe in case they should fall into the wrong hands, not that I don't trust Microsoft or whoever ADrive is with all my most precious documents, but I'd rather error on the side of safety.
Fedora Security :: Allow DNS In Iptables
Feb 1, 2009I have been struggling with this for a very long time now. I have installed Fedora Core 9 on my computer. I have set it up as a caching-nameserver and this is working.
Then I wanted to secure my server with iptables, and I have so far made this script:
# Load the connection tracker kernel module
modprobe ip_conntrack
iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP
[Code]....
I can reach the dns server with ping. When trying Nslookup it says that it got SERVFAIL from 127.0.0.1 trying next server, and then it times out.
My resolv.conf file lists:
nameserver 127.0.0.1
nameserver DNS-server
Fedora Security :: Can't Get FTP Through Iptables
Dec 14, 2009Im pulling my hair out trying to get ftp to work through iptables.Im using vsftpd
Table: filter
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
[code].....
Security :: Can't Zero Out Counters In Iptables
Feb 25, 2010I have a problem with iptables, when I execute
[code]....
Security :: Configure IPtables To Only Allow VNC Over SSH
Apr 4, 2010I am trying to figure out how I can configure IPtables to only allow VNC traffic to an internal server over SSH.
My configuration is WAN < --- > Gateway (Ubuntu 9.10 Server) < --- > Internal Server (that I want to control with VNC over SSH)
Security :: Incorporate Into Iptables
Jan 5, 2010I'm following an openvpn installtion how to and it says to add this to the iptables:
Quote:
# External Interface for VPN
# VPN Interface
VPNIF="tun0"
VPNNET="172.16.0.0/24"
VPNIP="172.16.0.1"
### OpenVPN
[Code]....
Any thoughts as the whole formatting is separate and has the addition of FORWARD rules, etc. I need the VPN running on the .199 address
Security :: Iptables :everything Works Except Ftp
Jun 3, 2010i set up a dmz to have a internet web server and ftp server, and ssh only from local network, so i wrote a iptables script to load during boot :
[Code]...
The problem is that everything works fine ( i have the same rules for other services such as samba, nfs, mysql on another server) BUT ftp there is no way to make it work. not even locally.when i try to connect, i log in, but while listing the directory i get MLSD ... and it hangs like this for a moment, then i get error message "connection time out" , "impossible to list directory". if i turn off the iptables script no problem,ftp works fine.. but why all services work and ftp no?
how do i have to modify the rules? what is strange also is that if i set as OUTPUT policy "accept", the server seems to be offline."host unknown" error message. I was thinking the rule INPUT is fine cause at least i can login, but the dir list is not going out, so gotta modify output rules. or state?
Security :: IPTables - How To Set Default Allow
Mar 19, 2010I've started a new job and have inherited a couple of RHEL4 64-bit servers. The firewall on them is currently disabled. I'm struggling to get them up and running as iptables is not the most user-friendly application. This lead me to downloading and trying a GUI front-end: Guarddog. Great app! But it doesn't have the default behavior I'm looking for. Here is what I need:
Default behavior: Firewall should be wide open, allowing ALL ports/IP's/TCP/UDP in and out of the server.
Blacklist: Oracle TCP port 1521 needs to be blocked in/out of the server.
This will help get us passed our company's security vulnerability scan. (We aren't able to patch/upgrade Oracle at this time because we'd lose vedor support with a legacy app). I will use these settings as a starting point, and then once I learn more and get more comfortable with iptables (or a GUI app) then I can fine tune things to make them more secure. As far as I know (correct me if I'm wrong) once I get a script I just copy it into /etc/rc.firewall and it will load when iptables starts.
Security :: Iptables To Block Ip From Ftp?
Mar 6, 2010Is this how I would do that?
iptables -A INPUT -p tcp --destination-port 21 -d ! 168.192.1.2 -j DROP
This should block all incoming connections on port 21 from 192.168.1.2, correct? Thus preventing that IP from logging into my FTP.
Fedora Security :: Iptables - Block Everything From Getting In My Pc
Mar 17, 2009What i wanted to do was block everything from getting in my pc but still be able to surf the web and still use instant messenger.
View 2 Replies View RelatedUbuntu Security :: How To Reset The Iptables
Jan 14, 2010i ran this
Code:
iptables -N rate-limit
iptables -A rate-limit -p tcp -m conntrack --ctstate NEW -m limit --limit 3/min --limit-burst 3 -j RETURN
iptables -A rate-limit -j DROP
iptables -I INPUT 1 -p tcp --dport 22 -j rate-limit
i am no longer able to ssh in to the machine , how can i reset iptables and firestarted back to default?