SYN flood attack log In CSA MC

I got an SYN flood attack log in CSA MC
CSA log: TESTMODE: A potential SYN Flood attack has been detected. This may also indicate a possible routing problem. Reason: The TCP Listen Queue is full using interface Wired\HP NC7781 Gigabit Server Adapter #2. TCP: CSA MC IP/5401->local Instance IP/4418, flags 0x12. The operation would have been denied.
(Note: In log I have specified CSA MC IP and local Instance IP instead of its IP address)
I understood that SYN flooding is a type of denial of service attack and this alert has occured when a TCP/IP connection was requested by MC to the Instance. It has resulted in a half open connection, as the return address that is not in use. MC has detected it and it got denied.
Please let me know what action I have to take at tins point?
Thanks
Arumugam.K

Arumugam,
We've been having similar issue regarding SYN flood alerts. The affected system in turn starts to send additional ACK requests. This results in issues with the IIS functionality on that server. Clients begin to no longer have the ability to access the site hosted on the server. We've been battling between Cisco and Microsoft on this one. The issue appears to have started around Patch Tuesday in February.
My question to you is this: Have you noticed any latency with the system that is reporting the SYN flood? I'm curious if the problem is local to us, or possibly wide spread.

Similar Messages

RV320 massive SYN Flooding attacks?

Hi
I have purchased a RV320 small business router for my home office, but i am experiencing massive SYN Flooding attacks when clients connect to my ftp and when rsync backup is performed.
My equipment consists of
Cisco RV320 Router running v1.1.0.09 (2013-07-04, 13:28:17) FW
Synology DS212 Nas
Setup
Cisco RV320 Router with static IP 192.168.1.1
WAN1 is used and configured with an static WAN IP
DHCP Range from 192.168.1.100 to 149
Port Range Forwarding Table
FTP[TCP/21~21] to IP 192.168.1.2
FTP Range[TCP/55536~55543] to IP 192.168.1.2
Rsync UDP[UDP/873~873] to IP 192.168.1.2
Synology DS212 Nas with static IP 192.168.1.2
Each time a user connects to my ftp server, I get a lot of these errors.
This is just a small sample of the log
[HACK] SynFlooding Attack
IN=eth1 OUT=eth0 SRC=xx.xxx.xx.xxx DST=192.168.1.2 DMAC=e0:2f:6d:75:34:d9 SMAC=00:13:72:52:16:5c LEN=52 TOS=0x00 PREC=0x00 TTL=120 ID=16112 DF PROTO=TCP SPT=45496 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
The same happens when an rsync backup is running on my DS212
2013-10-05, 12:11:15
[HACK] SynFlooding Attack
IN=eth1 OUT=eth0 SRC=xx.xxx.xxx.xx DST=192.168.1.2 DMAC=e0:2f:6d:75:34:d9 SMAC=00:13:72:52:16:5c LEN=60 TOS=0x00 PREC=0x00 TTL=54 ID=42649 DF PROTO=TCP SPT=36846 DPT=873 WINDOW=5840 RES=0x00 SYN URGP=0
If more information is needed please let me know
Any ideas why this happens?
Thanks
Martin

Maybe a stupid question, how do I create a support ticket?
If I click on the link "contact us" then I chose
Open a Technical Support Request here
But it require the following as you can read
Your login ID is not set up to access the TAC Service Request Tool (TSRT).
To obtain access, add all of your Cisco service contract numbers to your profile by going to the
Cisco Profile Manager - Request to Insert Contracts
. If you are a Cisco Partner or a customer with a Service Access Management Administrator, please contact that resource to obtain access to your service contracts. You may use the
Service Access Management Tool
to find your Service Access Management Administrator.
Unsure of your contract number? Your
Cisco Partner
, Reseller or Cisco Services representative can help provide a complete list of your service contracts.
The TAC Service Request Tool (TSRT) is designed to support contract-entitled services only at this time. For urgent issues or warranty service please contact the
Cisco Technical Assistance Center
via telephone.
See
Cisco Global Technical Services Quick Start Guide for additional assistance. Your login ID is not set up to access the TAC Service Request Tool (TSRT).
To obtain access, add all of your Cisco service contract numbers to your profile by going to the Cisco Profile Manager - Request to Insert Contracts. If you are a Cisco Partner or a customer with a Service Access Management Administrator, please contact that resource to obtain access to your service contracts. You may use the Service Access Management Tool to find your Service Access Management Administrator.
Unsure of your contract number? Your Cisco Partner, Reseller or Cisco Services representative can help provide a complete list of your service contracts.
The TAC Service Request Tool (TSRT) is designed to support contract-entitled services only at this time. For urgent issues or warranty service please contact the Cisco Technical Assistance Center via telephone.
See Cisco Global Technical Services Quick Start Guide for additional assistance.

A SYN flood attack!

when i run
server$ dmesg command i got this message.
WARNING: High TCP connect timeout rate! System (port 8080) may be under a SYN flood attack!

is the ip given a public ip and is the sun machine behind a firewall or running a firewall? most new deployed servers will not see enough traffic on segments behind firewalls to cause messages like this. ive run scanners that can cause messages like this or test clients that generate load as well...

Syn flood attack?

Hello,
I work in an organization in which there is an automatic monitoring of network connections. Yesterday I had a notification of a possible syn flood attack originated by my Mac targeting an IP address (and port: 8000) that I found out to be associated to an internet radio. I did some network monitoring and I found out that with iTunes closed there were no packets with that IP as destination address... has anyone experinced such a problem?
Sincerely
Giuseppe

Arumugam,
We've been having similar issue regarding SYN flood alerts. The affected system in turn starts to send additional ACK requests. This results in issues with the IIS functionality on that server. Clients begin to no longer have the ability to access the site hosted on the server. We've been battling between Cisco and Microsoft on this one. The issue appears to have started around Patch Tuesday in February.
My question to you is this: Have you noticed any latency with the system that is reporting the SYN flood? I'm curious if the problem is local to us, or possibly wide spread.

Syn flood signature 6009/0 actions

Hi is there an option when this signature fires to block the attacker or this attack and not just log the attack? I tried to set the actions but the log says no action taken.

Hi Thx for the answer. I did add the action but no luck or does it nog log this action? The traffic hits the client inside the network so the ips does not block.
Event ID
1397033001306299442
Severity
high
Host ID
IPS-DEB1-1
Application Name
sensorApp
Event Time
01/06/2015 10:18:30
Sensor Local Time
01/06/2015 09:18:30
Signature ID
6009
Signature Sub-ID
0
Signature Name
SYN Flood DOS
Signature Version
S593
Signature Details
SYN Flood DOS
Interface Group
vs1
VLAN ID
0
Interface
te7_0
Attacker IP
xx.xx.xxx.84
Protocol
tcp
Attacker Port
1321
Attacker Locality
OUT
Target IP
yy.yy.yy.102
Target Port
80
Target Locality
OUT
Target OS
unknown unknown (relevant)
Actions
Risk Rating
TVR=medium ARR=relevant
Risk Rating Value
95
Threat Rating
95
Reputation
Context Data
Packet Data
Event Summary
0
Initial Alert
Summary Type
Final Alert
Event Status
New
Event Notes

Sig SYN Flood DOS id="6009" dest address 0.0.0.0

Hi, All!
I receive sig 6009 with destination address 0.0.0.0:
evIdsAlert: eventId="1244180117471597849" severity="medium" vendor="Cisco"
originator:
hostId: IDS
appName: sensorApp
appInstanceId: 413
time: Jul 6 2009 14:18:14 EEST (1246879094502611000) offset="180" timeZone="UTC"
signature: created="20060220" type="anomaly" version="S214" description="SYN Flood DOS" id="6009"
subsigId: 0
sigDetails: SYN Flood DOS
marsCategory: DoS/Host
marsCategory: DoS/Network/TCP
interfaceGroup: vs0
vlan: 0
participants:
attacker:
addr: 192.168.155.72 locality="OUT"
port: 0
target:
addr: 0.0.0.0 locality="OUT"
port: 0
os: idSource="unknown" relevance="unknown" type="unknown"
summary: 3 final="true" initialAlert="1244180117471597835" summaryType="Regular"
alertDetails: Regular Summary: 3 events this interval ;
riskRatingValue: 63 targetValueRating="medium"
threatRatingValue: 63
interface: fe0_1
protocol: tcp
I cannot get at the meaning - address 0.0.0.0?
It`s bug?

No, it's not a bug. The scanning signatures summerize the attacked addresses into 0.0.0.0
This is because in scans there are a LOT of dezstination addresses that are hit inorder to fire the signature but there is only one attacked address field in ever signature.

Syn Flood :0(

We have a very large network at work and we have been having some internet timeout issues so we got some people in to monitor packets and perform a general network health check.
I got called up by the networking people saying that there has been a syn flood detected coming from my mac address on my macbook :0(
I know that mac’s are subject to network attacks but I thought that I have covered all my bases, I have Symantec installed and I keep up to date with my security updates etc.
Can anybody give me any pointers as to where to start to diagnose if there is an issue with my mac, I have used macscan and that found nothing I have also used little snitch to see if anything crops up asking for a network connect but nothing :0(
Any suggestions are greatly appreciated!

Sounds like something that should be posted to the Networking or Server Products forum.

Syn flood software?

i'm trying to test some syn flood mitigation techniques in my lab studies and i'm looking for a decent syn flood prog if anyone knows of one. tia.

If you check out the Sectools website (sectools.org) or if you download BackTrack (http://www.remote-exploit.org/backtrack_download.html) you can find a lot of really useful tools. Most of these are hacking tools so be sure to use them in accordance with whatever policies you are subject. I've used hPing in the past to simiulate syn floods and dDos attacks.
Good luck!

Printk flooding messages.log

anyway to stop this?
when connected wirelessly (WAP or VPN) printk is going crazy flooding messages.log with useless debug messages:
"printk: 1 messages suppressed"
this is not happening when connected to wired network (it is caused by net_ratelimit/IEEE80211_DEBUG_DROP log)
I thought that this was fixed in 2.6.24.0, obviously is not.
Also I can't disable printk in kernel config (at least for time being)

Steven,
It sounds like you have docked the Log Window on the left-hand side rather than the bottom.
If you click and drag on the Log Window caption bar so that you are over the background area and then move your mouse towards the very top of the Status Bar you should see the Log Window expand to the full screen width that you want.
Hope that helps,
Lisa Sherriff
JDev QA

SATA driver flooding System.log, filling up startup disk

My system.log seems to be filling up with SATA error messages, about 10 per second. The log is now so large that I can't even get the Console app to open it (only in Open Quick, which seems to show little snippets of the log only).
This seems to have started when I installed an Initio 1623 SATA controller as part of a GraniteDigital drive upgrade. The controller worked, the drives worked. I've since pulled the controller card, but it seems the driver continues to flood the log file!
The drivers for the controller are apparently built in to OSX (at least in 10.4.7...) so there is no way to update the driver separately.
Restarting the machine hasn't helped. For now, I have to keep moving files to other disks to keep this G5 functioning.
How can I A) delete the log file to gain some time?
B) make this error stop?
Thanks.

Well - maybe it isn't a SATA driver system.log. I can't read the system.log because it keeps refreshing so the data in on the screen for less than a second before it refreshes. AND there is so much disk thashing that the system is barely responsive.
The only visible log entries are:
Jul 19 04:28:10 Platinum kernel[0]: Inic1622: SATA - Int no command active (repeated about ten times)
Jul 19 04:28:10 Platinum kernel[0]: and active
and repeat....
The log file is showing a size of 4.5 GB

Syn flood DOS (6009)

The signature for syn flood DOS (6009) has two values that I can see will alter the signature threshold.
event-counter
event-count: 2600 default: 200
event-count-key: AxBx <defaulted>
specify-alert-interval
yes
alert-interval: 2 default: 2
The definition for the signature is that it will detect a flood of TCP SYN packets at a rate of 100 per second or greater. We have tried to adjust the signature that this value is higher and no matter what the event count is, it continues to trigger in our environment. At 1300 syns per/sec, (event-count: 2600) an alert is still received for http proxy servers.
Have I over looked the parameter that needs to be adjusted in order to increase the threshold of this signature or is it just not tunable.

By default, flows with 200pkts/2sec above are alerted. You can change the threshold by CLI

Delete log at CSA

Hi all,
I use CSA version 5.1, I install CSA at DNS, MAIL and WEB. Now, when I connect to webpage of CSA to manage, I see the inform "he event database now contains approximately 900004 events. This is in danger of exceeding the configured limit. In order to preserve correct operation, events of priority Alert and below will not be logged. Since the last report of this type, 1 events have not been logged. Please purge the event database as soon as possible." and I can't receive log from all server at DMZ. Now, I want to delete log at CSA MC and I can receive log from all server at DMZ. How can I do that?
Thank you very much.
Best regards,
Duy Khang

Duy Khang,
You will need to delete some events starting with old and/or unimportant ones first and then purge the database.
Mine stays at around 200000.
You'll also want to configure your event logging to log only those events you want see and/or retain.
That should keep it from filling up.
What DB are you using?
Tom

DFSN-Server ID 516 Flooding Event Log

Good Day,
Since setting up a Server 2012 server as a DFS root the Administrative Events log is getting flooded with DFSN-Server ID 516 warning events. We have multiple name spaces and we get a message for each every 15 minutes, so for our 6 name spaces
that is over 500 messages a day.
DFSN service has started performing complete refresh of metadata for namespace <DFS-Root>. This task can take time if the namespace has large number of folders and may delay namespace administration operations.
Although I found one solution on the Russian Technet forum DFSN-Server EventID 516 this disables the entire DFSN-Server
Admin log, so if there are any problems with the refresh they will not appear.
The main cause of the problem appears to be that the 516 Events have a Warning level 3 for something that should be Information level 4. There is no reason for a warning to be issued for what is a regular update process.
Thanks,
James

What bothers me is that those events mention only "started a complete refresh", but they never mention so far completing one ... weird...
Thank you Microsoft (sarcasm).
If you look directly at the log, you'll see this message is quickly followed by ID 517 which states it has completed the refresh. Event 517 is an informational event, so it won't display in the default "Administrative Events" filter.
My suggestion to Microsoft: Change the severity on ID 516 to Informational. I don't believe
anyone would consider this routine refresh a warning-level concern!!
yes, you are right. sorry for super late reply, but I was swamped in company move and server upgrades, new installations, new IP phone system, new IP cams, site-to-site VPN, new faster firewall for new faster Internet link, NAT config changes ... man ...
a bit too much for a single person to manage sometimes ...
anyways, I didn't see the 517 events in "Custom Views - Administrative Events" that's why I was alerted with a flood of 516 (there is 1 every 12 minutes), can't understand why MS would drop one informational event (categorized wrongly as warning)
and not add the other one stating it was completed right after (because it's still informational only) ... I finally found the following 517's when I went to the tree of Apps and Services Logs - MS - Win - DFSN-Server - Admin ... it's kinda buried down there
very annoying it still is in end of October, especially then I am troubleshooting a non-replication conditions without any errors between two DFS servers (also DC roles installed) running 2012R2. Ended up removing DFS from secondary DC (VM actually) and
building a new DFS dedicated VM with fixed sized disks on Hyper-V 2012 R2 server, hoping it resolves the issue when replication would just stop without error creating a huge file count (and content!) mismatch over time... a flood of meaningless events in administrative
logs in not helping with troubleshooting ...

Flash CS3 flooding system.log

Hi there,
is there any reason Flash CS3 is flooding my system.log? I'm
on Mac OS X.5 ( 10.5 Leopard ). After an 8 hour workday, my logfile
is usualy around 800megs to 1Gbyte in size and it's full with stuff
like this:
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: Key Value Pair: pos
= 2080
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: got type name:
Number
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: var LOG10E:Number
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: addFunction
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: metadata name =
__go_to_definition_help
May 13 14:00:57 iMac
[0x0-0x45045].com.adobe.flash-9.0-en_us[1244]: Key Value Pair: file
=
E:\flashfarm\depot\main\player\branches\FlashPlayer\FlashPlayer9_DotReleases\avmplus\core \Math.as
Any chance I can disable this?
thank you! :)

Well - maybe it isn't a SATA driver system.log. I can't read the system.log because it keeps refreshing so the data in on the screen for less than a second before it refreshes. AND there is so much disk thashing that the system is barely responsive.
The only visible log entries are:
Jul 19 04:28:10 Platinum kernel[0]: Inic1622: SATA - Int no command active (repeated about ten times)
Jul 19 04:28:10 Platinum kernel[0]: and active
and repeat....
The log file is showing a size of 4.5 GB

Automount floods LDAP Log - need help

I've installed an LDAP server on a linux machine (with debian 5.0.4 on it), so I can share my login/home-directorys among my mac minis.
It took me a while to get everything working, but now I don't know how to fix this problem.
The users home-directorys are provided through a NFS server (also running on the linux machine) and in LDAP I have configured these automount setting:
dn: ou=mounts,dc=chemnitz,dc=abs-rz,dc=de
objectClass: top
objectClass: organizationalUnit
objectClass: domainRelatedObject
associatedDomain: chemnitz.abs-rz.de
ou: mounts
dn: automountKey=/home,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de
objectClass: automount
objectClass: top
automountInformation: auto_home
automountKey: /home
dn: automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de
objectClass: automount
objectClass: top
automountInformation: -fstype=nfs yoda3-vm4.chemnitz.abs-rz.de:/nfs/&
automountKey: *
dn: automountMapName=auto_master,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de
objectClass: automountMap
objectClass: top
automountMapName: auto_master
dn: automountMapName=auto_home,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de
objectClass: automountMap
objectClass: top
automountMapName: auto_home
In the user entry, there is an associating information about the home-directory f.e. /home/mg.
Everything works fine so far but the logs of my LDAP are flooded with this:
=> dn: [2]
=> acl_get: [3] attr automountKey
=> acl_mask: access to entry "automountKey=/home,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de", attr "automountKey" requested
=> acl_mask: to value by "", (=0)
<= check adnpat: cn=admin,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=frank,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=mg,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: *
<= acl_mask: [4] applying read(=rscxd) (stop)
<= acl_mask: [4] mask: read(=rscxd)
=> slapaccessallowed: search access granted by read(=rscxd)
=> access_allowed: search access granted by read(=rscxd)
=> access_allowed: search access to "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de" "objectClass" requested
=> dn: [2]
=> acl_get: [3] attr objectClass
=> acl_mask: access to entry "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de", attr "objectClass" requested
=> acl_mask: to value by "", (=0)
<= check adnpat: cn=admin,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=frank,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=mg,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: *
<= acl_mask: [4] applying read(=rscxd) (stop)
<= acl_mask: [4] mask: read(=rscxd)
=> slapaccessallowed: search access granted by read(=rscxd)
=> access_allowed: search access granted by read(=rscxd)
=> access_allowed: search access to "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de" "automountKey" requested
=> dn: [2]
=> acl_get: [3] attr automountKey
=> acl_mask: access to entry "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de", attr "automountKey" requested
=> acl_mask: to value by "", (=0)
<= check adnpat: cn=admin,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=frank,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=mg,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: *
<= acl_mask: [4] applying read(=rscxd) (stop)
<= acl_mask: [4] mask: read(=rscxd)
=> slapaccessallowed: search access granted by read(=rscxd)
=> access_allowed: search access granted by read(=rscxd)
=> access_allowed: read access to "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de" "entry" requested
=> dn: [2]
=> acl_get: [3] attr entry
=> acl_mask: access to entry "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de", attr "entry" requested
=> acl_mask: to all values by "", (=0)
<= check adnpat: cn=admin,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=frank,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: uid=mg,ou=users,dc=chemnitz,dc=abs-rz,dc=de
<= check adnpat: *
<= acl_mask: [4] applying read(=rscxd) (stop)
<= acl_mask: [4] mask: read(=rscxd)
=> slapaccessallowed: read access granted by read(=rscxd)
=> access_allowed: read access granted by read(=rscxd)
=> access_allowed: read access to "automountKey=*,ou=mounts,dc=chemnitz,dc=abs-rz,dc=de" "automountInformation" requested
About 4 or 5 logs per second - Is this normal? - What can I do to reduce this traffic?
My slapd is running mit -d acl and there is only 1 client logged on.
Thank you in advance for your help.
- mgoe

no ideas?

SYN flood attack log In CSA MC

Similar Messages

Maybe you are looking for