Soldier Lee Cheol-woo (5)
As soon as I made plans on how to work, my hands moved faster than anyone else.
‘If we change this part like this, it will be more secure.’
Not only the vulnerabilities of the existing NAC and the points to be supplemented, but also the user’s convenience of use began to be addressed.
‘hmm… … . There was a vulnerability here too?’
Vulnerabilities continued to appear even while looking at the source and creating a new one. I don’t know how this security system was not breached and continued to be used.
I’ll have to ask Sang-cheol, a security expert, about this.
“Sangcheol-ah, would you like to see this part?”
“Where are you talking?”
“Look carefully here. If you coded this part like this, wouldn’t it be easy to infiltrate because the external port is open? I think you can use the Mask command.”
“Uh……? Please wait a moment. I will try it myself.”
As if Sangcheol knew something, he went to his computer and entered the command right away.
“Corporal Lee is right. Infiltration is actually possible.”
“yes?”
“Wow, I couldn’t figure it out even after looking at the source, but you’re really amazing. How did you know?”
“I knew it when I saw it.”
“Hey…”
“There is such a vulnerability, what was North Korea doing?
“Ah, that’s probably not it. I heard somewhere that the real Top Secret is kept in double, triple.”
“So you’re saying the general secret might have been leaked?”
“Well, I guess not again.”
“why?”
“Yeah… Even the North Koreans didn’t think that there would be such a vulnerability. Wouldn’t it be possible because it’s Corporal Lee? Team leader Cho Hyuk!”
Then, Sang-cheol called Cho Hyuk, the team leader of KISA.
“Yes. Did you call?”
“Yes. Could you take a look at this part here? This is the newly discovered NAC vulnerability by Corporal Lee.”
“wait a minute.”
Team leader Cho Hyuk assisted us.
“Oh, that’s right. It’s definitely vulnerable. If you use the Linux Mask? program, it can be penetrated. How did you know this? It’s something that our KISA couldn’t figure out either.”
“Corporal Lee figured it out right away.”
“Heh heh, winning first place in a real security vulnerability contest is different. Really, that’s great. Corporal Lee.”
“yes?”
“Can I report this part to KISA and upload it?”
“Report to KISA? I don’t care, but why?”
Is this something to report there?
“There are many places other than military bases that use NAC. In particular, it’s not uncommon for large corporations to build a separate in-house network because of technology leaks. Security vulnerability updates have to be recommended there.”
“Ah! Yes. I see.”
“Of course, I will report in the name of Corporal Lee.”
“…… Yes. As you like.”
After a while, there was a happening, and then development continued.
* * *
Nearly two months have already passed since the creation of a new NAC program, no, an integrated security solution. My dispatch time is about 3 months.
Now, there is only a little over a month left.
Development was proceeding smoothly. The program is nearing completion, and I was meticulously checking to see if there were any deficiencies.
actually… … . Although it was a big deal that I was delaying it to drink more honey.
It was in the middle of sucking honey.
– Beep! Beep! Beep!
A loud siren resonates through the control team 1.
“What’s the matter!”
Officer Lim, who is in charge of Control Team 1, shouted.
“Lim Lim! Signs of a cyber attack have been detected in North Korea.”
“What do you mean? Tell me so I can understand!”
“North Korean IP continues to flow into our military server. It’s an obvious hacking attempt.”
“Hacking attempt?”
“Yes, it is.”
“No, what do you mean! How does North Korean IP enter the intranet!”
Then I found it a bit strange. The intranet network was physically blocked from the outside world. Of course, there was no way to be connected to North Korea.
“I’m figuring that out.”
“Quickly figure that out! If the server is breached, it’s really doomed!”
What kind of fuss is this all of a sudden… … .
“I got it.”
Team leader Jo Hyuk, who was silently doing his job by the side, said.
“What’s the problem?”
“It’s a NAC issue.”
“NAC? What does that have to do with it?”
“The NAC server is actually connected to the intranet network. It penetrates the vulnerability of NAC and connects to the intranet network.”
“Then is there a solution?”
“Right now, it’s best to turn off NAC.”
“Yes? Turning off NAC? Wouldn’t that make it rather inoperable?”
“No, it’s not. It’s a vulnerability in NAC itself, so if you don’t use NAC service, that vulnerability will go away. Instead, you won’t be able to use the military’s internal Internet for a while.”
“…… I can’t use the internet inside the military.”
Lim thought for a moment before speaking again.
“Stop NAC.”
“all right.”
At Lim’s command, the NAC service completely stopped working.
“Hacking attack stopped.”
“after…….”
“phew…….”
Everyone was relieved that the attack had stopped.
“Where’s the problem with NAC?”
“It’s not yet accurate, but if you predict carefully, it’s a vulnerability previously discovered by Corporal Lee.”
“……Is that there?”
“Yes. Yes. Not yet accurate information.”
“You corporal!”
“Yes. Lim Lim.”
“How’s that security patch going? I can’t wait any longer. I’ve had NAC down for a while now, but the army’s internet is all down right now.”
“Uh… Anyway, I was thinking of testing it out today.”
There’s nothing I can do about it.
“Hmm, please hurry up as soon as possible. I’m going to report to superiors.”
“Yes! I see. Loyalty!”
The moment Lim was about to leave the control team, the commander came.
“Loyalty!”
“Loyalty! You just had an emergency?”
Since it is a serious cyber security issue, it seemed that the commander came down directly.
“Yes. That’s right. Presumed to be North Korea’s cyber operation unit ….”
Lim Lim reported to the commander.
“Ha. So it’s a NAC problem?”
“Yes, it is.”
“In the end, things broke. Ha…. Aide.”
“Yes. Commander.”
“The president of the security company, tell them to come out immediately!”
“all right.”
“Lim Lim. What is the current situation?”
“The NAC service is down. As a result, the entire internet network in the military base is currently down.”
“Is there a solution?”
“Unless this corporal’s new vulnerability patch is applied, the NAC service will not be operational again.”
“… Corporal Lee.”
“Corporal Lee Cheol-woo!”
“How far have you been working?”
“All done. We are leaving only the test for now.”
“test?”
“Yes! That’s right. We haven’t secured stability yet, so I think we need to test it.”
“What about uploading it as a commercial service right away?”
“Uh…. There may be errors along the way.”
“Then put it right up!”
“yes?”
“It’s an order. Raise it.”
“……. all right.”
The commander must have been in a hurry too, so he ordered the program to be uploaded right away, which had not yet been verified.
Well, wouldn’t it have been better? Because you don’t have to go through tests here and there.
“Lim Lim, you need the server’s master privileges.”
“…… Commander?”
“Hand it over.”
“all right.”
Something has suddenly turned around.
I received the connection information of the server’s master account, that is, the root account, from Jun-wi Lim, and I created NAC… … . No, it started to change to an integrated security program.
I don’t know if this is correct.
According to the original plan, the program I created will be thoroughly verified by other organizations and even installed.
Can I just upload it like this because it’s an emergency?
what… … . The Commander ordered it, but there shouldn’t be much trouble.
It is an emergency situation in which North Korea has launched a cyber attack.
“Uploaded the integrated security program. Confirmed that it is working properly.”
“What’s the situation?”
“No special movement. No errors are currently occurring.”
Team leader Cho Hyuk said instead.
“What is the internet network in the military?”
“It’s working fine. It doesn’t show any signs of danger.”
“…?”
When Team Leader Cho Hyuk said this, the commander was confused.
“Everything works fine? No errors, no attacks?”
“Uh… Wait a minute. We’re getting logs of an attack from North Korea, but the warning signal is green.”
“What does that mean?”
From noble mtl dot com
“An attack is coming in, but it means that it is being blocked normally. So, in the past, the intranet network was in danger because NAC was breached, but now it is blocked by NAC itself, so there is no problem.”
“……. Did you say Corporal Lee Cheol-woo? The one who made this security program.”
“Yes, it is.”
The commander was silent for a moment, then spoke again.
“Really… that’s amazing.”
* * *
North Korea’s Cyber Troops.
After several years of research, Sergeant Ryu Jin-yeol discovered a vulnerability in NAC.
“Comrade, are you ready?”
“Yes, I’m ready…”
“Attack the attack right away! Think of the future of our nation hanging at your fingertips this time!”
“Yes! I see.”
Sergeant Ryu proceeded with the attack as he had prepared step by step.
“How’s it going?”
“We launched an attack by finding a vulnerability in the NAC used by the South Korean military base. For that reason, we are putting an attack on the South Korean military base’s exclusive network.”
“Don’t be distracted by our spicy cyber attacks, South Korean bastards.”
“Yes! That’s right. You must be out of your mind right now.”
“If we take over the intranet, all the secrets of the South Korean children are ours. How long do you think it will take?”
They didn’t expect that much, but they were excited because it was a successful attack after a long time.
“Attempting a SQL injection attack, results should come in a little while.”
Excited, they continued their attack.
“Oops, NAC’s service is down.”
“Stop? So what?”
“It’s safe to say that they detected our attack and used their last resort.”
“So South Koreans can’t use the Internet?”
“Yes. It is.”
“hahahaha! The hacking attack is a little disappointing, but that alone is a major victory for us! How long do you think it will take them to recover?”
They also did not expect to steal all the secrets through this hack. It was good even if it was just a little hit.
And it seemed to work.
“I’m carefully guessing that it will take at least ten days.”
“hahahahaha, the South Korean children must have realized our cyber power.”
30 minutes to celebrate victory like that.
“……? What a strange comrade.”
“What’s wrong?”
“South Korea’s NAC has risen again.”
“Huh? Are you promoting an attack now? Then attack again!”
“That’s… I tried to attack. But, it’s impossible.”
“What are you talking about? You hacked NAC just a moment ago, didn’t you?”
“Yes, but… not anymore.”
“What are you talking about? Then you mean that the South Korean idiots corrected and updated the NAC in that short time?”
“Oh, that’s all I can think of right now.”
While they were doing this, someone ran and shouted.
“Comrades, comrades!”
“What’s the fuss?”
“The back hole planted half a year ago has been removed.”
The backhole they were talking about was the backdoor that had been planted in the past as a mortal attack.
In order to be able to access the server of the Korean military at any time, of course, it was not possible to access all servers, but it was limited.
Still, it was a precious backdoor for them.
Because the backdoor could have collected even more information.
“Eh? Why was it suddenly removed?”
“I’m figuring it out. I guess the whole South Korean security system has been updated.”
“Huh? Is that possible?”
“No. I haven’t heard of any such intelligence.”
Of course, Cheol-woo’s security program was not officially developed, so information could not reach North Korea.
Because even the security commander didn’t know about it right away.
“……? Then, what is the meaning of this?”
“Comrade, didn’t you just try hacking? Didn’t you modify it after being attacked?”
“Hasn’t it been 30 minutes?”
“……? What is it?”
“That’s what I want to ask.”
“…… Comrade, it seems that there are monsters living in South Korea.”