Security

LINE Taiwan Security Meetup – BECKS #3

Information security has always been one of the key focuses of LINE. LINE has always strove to actively promote various security enhancement strategies over the years. As a part of our ongoing effort towards information security, LINE information security engineers hold a meetup known as BECKS (a portmanteau of beer and hacks) in Korea, Japan, […]

LINE New-Grad Engineers: [June] Security Engineers

LINE welcomed 33 newly graduated engineers this year. In this monthly series, they will be introducing their experiences and an overview of the work that they do. 

For our second article in the series, we have invited Mr. Koh from the Application Security Team to talk about his initial work and experiences.

Monitoring to prevent game cheating

It has been six years since we’ve began LINE GAME, and over those six years we’ve been through many experiences. Today, I’d like to share some lessons we’ve learned along the six-year journey of LINE GAME, specifically focusing on how we used monitoring to prevent game cheating. When I say “game cheat” in this blog […]

How AIR ARMOR checks iOS Code Signing

AIR ARMOR is a security solution of AIR; AIR is a component of the LINE GAME PLATFORM. You can refer to Seunghoon’s posting on AIR GO and APK Signing for information on the APK signature scheme. For this posting, I’ll explain about iOS code signing, one of Apple’s security mechanism. Code signing is to verify the integrity of the software code […]

LINE Security Bug Bounty Program Report 2018

Hello, this is Kazuhiro Kubota from the LINE Security Department. Last time we brought you the report for the first half of 2018. Today, I’d like to summarize the results of the LINE Security Bug Bounty program for 2018. Number of reports in 2018 In 2018, a total of 88 reports qualified for the program. This figure is almost twice as many […]

Buffer overflow in PJSIP, a VoIP open source library

Hi all, I am Youngsung Kim (Facebook, Twitter) of the Application Security team at LINE and am in charge of evaluating security of LINE services. On this post, I’d like to share a vulnerability (CVE-2017-16872, AST-2017-009) of PJSIP, a VoIP open source library. PJSIP is a multimedia communication library based on the following standard protocols; SIP, SDP, RTP, STUN, TURN, and ICE. The Asterisk framework, widely used on IP-PBX and VoPI gateway has an SIP stack implemented based on PJSIP.

The cause of the vulnerability was due to incautiousness about sign extension for Integers in the process of converting signed int to unsigned long when handling client’s SIP requests on 64-bit environment. There was no window to report the security issue to the PJSIP development teams, so I made my report to the Asterisk’s security page. Afterwards, I’ve consulted with George Joseph, an engineer at Asterisk, and the patch (PJSIP patch, Asterisk patch) has been applied on the pjproject v2.7.1. I’d like to express my gratitude to George for processing the patch.

LINE Security Bug Bounty Program Report 2017

Hello again, this is Myoungje Yi (MJ) from LINE’s security team. I’d like to share our annual report on running the LINE Security Bug Bounty Program in 2017.

Program scope expansion & donation option

The ‘LINE Security Bug Bounty Program’ aims to provide LINE users the most secure service by fixing potential vulnerabilities in advance, by getting reports from external security researchers. As we have already mentioned in our previous post, we have expanded the program scope in 2017, which resulted in an increased number of reports submitted. In November 2017, we have added an option allowing reporters to donate their reward.

LINE and Intertrust Security Summit 2017 Spring, Tokyo 1

Hello, this is Ichihara from the LINE security team. I am in charge of security consultation for LINE services, providing countermeasures for account hacking and abusing, researching authentication technology, and engaging in standardization activities.

Today, I would like to share with you an event titled, “LINE and Intertrust Security Summit 2017 Spring, Tokyo”, co-hosted by LINE and Intertrust on May 17. I will cover this event over two posts; this is the first part of the recap. Have a look at the second part from here

Here is a few basic information of the event.


LINE and Intertrust Security Summit 2017 Spring, Tokyo 2

Hello, this is Ichihara from the LINE security team. I am in charge of security consultation for LINE services, providing countermeasures for account hacking and abusing, researching authentication technology, and engaging in standardization activities.

Today, I would like to share with you an event titled, “LINE and Intertrust Security Summit 2017 Spring, Tokyo”, co-hosted by LINE and Intertrust on May 17. I will cover this event over two posts; this is the second part of the recap. Have a look at the first part from here

Here is a few basic information of the event.


Outcomes of the LINE Security Bug Bounty Program

About the LINE Security Bug Bounty Program

Hello, my name is Lee Myoung Jae (MJ) and I’m in charge of security at LINE. In this post I’m going to talk about the LINE Security Bug Bounty Program and the results of the program in 2016. The LINE Security Bug Bounty Program is an ongoing program to make the LINE app more secure for our users by letting external engineers submit bug (vulnerability) reports which we would then immediately fix.

We first conducted a trial run of the program called the LINE Bug Bounty Program from August 24 to September 23 in 2015. Based on our experience from that trial, we made various changes to create an improved bug bounty program for 2016. And on June 2, 2016, we launched the new and improved LINE Security Bug Bounty Program.

For more information about the LINE Bug Bounty Program, see our previous blog posts: “Introducing the LINE Bug Bounty Program” and “Results From the LINE Bug Bounty”

LINE Security Bug Bounty Program website: https://bugbounty.linecorp.com/